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Posted: 6/5/2010 5:43:03 PM EDT
I received my 95 TTSXs from the HTR group buy a few weeks back and have not been able to do anything with them until today.....
We're running them in the 6.8ARk cartridge....the loads are coming along and look like they should make one hell of a game load....set them up in one of our test rigs with a 18" 1:11 .272 / .277 and Adams Arms mid-length piston system.... 
Reloading data for comparison ( use at own risk ) 90gr TNT, 28gr 2230 = 2,550 fps avg. 90gr TNT, 30gr 2230 = 2,750 fps avg. 90gr TNT, 32gr 2230 = 2,950 fps avg. 90gr TNT, 32.5gr 2230 = 3,010 fps avg. 95gr TTSX, 30gr 2230 = 2,795 fps avg. 95gr TTSX, 31gr 2230 = 2,880 fps avg. 95gr TTSX, 32gr 2230 = 2,925 fps avg. 90gr TNT, 28gr 1680 = 3,075 fps avg. 90gr TNT, 29gr 1680 = 3,120 fps avg. 90gr TNT, 29.6gr 1680 = 3,155 fps avg. 95gr TTSX, 28gr 1680 = 3,050 fps avg. 95gr TTSX, 28.6gr 1680 = 3,106 fps avg. 95gr TTSX, 28.8gr 1680 = 3,118 fps avg. 
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Posted: 6/5/2010 6:04:07 PM EDT
[#1]
What is this 6.8ARk cartridge you speak of?
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Posted: 6/5/2010 6:23:37 PM EDT
[#2]
Excellent .
I really want to try these in your other variant. You did some work to get the AA under the TRX? (could also be pertinent to my interests) |
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Posted: 6/5/2010 6:56:51 PM EDT
[#3]
Quoted:
What is this 6.8ARk cartridge you speak of? It's a wildcat cartridge based off of 7.62x39 Russian or Grendel brass.... 6.8 ARk, 7 ARK, .30 ARk 
We have made the ARk in .25, 6.8, 7, 7.62, .338, and .358 .......casemouth and shoulder moved a little, shoulder angle depending on caliber (20* to 35*) |
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Posted: 6/5/2010 7:06:54 PM EDT
[#4]
Quoted:
Excellent .
I really want to try these in your other variant. You did some work to get the AA under the TRX? (could also be pertinent to my interests) They're pretty long....( 1.033" ) kinda blunt too....the ogive starts to turn in right in front of the first bearing ring...... The mid TRX fits the mid AA as a drop in with about 3/32" between the end of the rail and gas block.... The carbine TRX needs a little mod work, it's about 1/2" too long, but if you mill it in right.....the end result is a continuous uninterrupted rail....I'll try and post some pics, did a 7.62x40 build with one a week or so back....looks pretty cool.... |
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Posted: 6/6/2010 12:24:24 AM EDT
[#5]
That is definitely going to do work....
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Posted: 6/6/2010 9:01:50 AM EDT
[#6]
Quoted:
Excellent .
I really want to try these in your other variant. You did some work to get the AA under the TRX? (could also be pertinent to my interests) This is a pic of the carbine set-up.....the spacing works out so a BUIS can straddle the two and lock them together....works pretty good, doesn't seem to have any negative impact on accuracy, still shoots at an inch..... 
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Posted: 6/6/2010 9:10:29 AM EDT
[#7]
So on the mid length TRX you didn't have to do any modifications to the rail itself to get the Adams Arms mid length gas piston to fit?
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Posted: 6/6/2010 9:15:19 AM EDT
[#8]
Quoted:
That is definitely going to do work.... Right now it's running a little more than 200 fps than my SPC....so it should extend the expansion range by about 150 yds.....gonna do some field work to calculate an actual BC at 3,000 fps.... |
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Posted: 6/6/2010 9:30:03 AM EDT
[#9]
Quoted:
So on the mid length TRX you didn't have to do any modifications to the rail itself to get the Adams Arms mid length gas piston to fit? Mid length went together fine with no mods.....set it up with a 8.755 gas system, from extension shoulder to gas block shoulder and it ended up having about 3/32" between the end of the rail and the gas block....the rail tunnel fit the piston rod fine, it's close but does not touch.....as would be expected with the piston system, alignment of everything is critical....runs flawless and clean.....one of the things I like about it is no rose colored bullets, meaning the hot DI gas doesn't get the chance to pre-heat the up coming bullet in the mag....makes for more consistant loads, not as much temp change.... |
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Posted: 6/6/2010 9:56:34 AM EDT
[#10]
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That is definitely going to do work.... Right now it's running a little more than 200 fps than my SPC....so it should extend the expansion range by about 150 yds.....gonna do some field work to calculate an actual BC at 3,000 fps.... when I did the match for 200 extra FPS it should give you 75 yards more of expansion range... but if the BC is better then what is advertised you may get more... What bolt are you running with the ARK? are you having any issues with running loads to 55K or so pressure? |
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Posted: 6/6/2010 10:52:46 AM EDT
[#11]
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That is definitely going to do work.... Right now it's running a little more than 200 fps than my SPC....so it should extend the expansion range by about 150 yds.....gonna do some field work to calculate an actual BC at 3,000 fps.... when I did the match for 200 extra FPS it should give you 75 yards more of expansion range... but if the BC is better then what is advertised you may get more... What bolt are you running with the ARK? are you having any issues with running loads to 55K or so pressure? I don't think the BC is gonna get much better, they get to .277 pretty quick......It's closer to 300 before seeing .001 casehead growth on both cartridges but at 200 using a .295 BC and 1,700 expansion....yep, 487 vs 412...75 yds....at 300 it's 15 or so yards more..... I've been using Oly x39 bolts.....have around 800 rounds on the 7mm and about 400 on the 6.8.....no probs...... I ran two loads hotter than what was posted before seeing .001 casehead growth, so the celing is a little higher.....The Lapua brass is pretty stiff, but if it's allowed to move....it will... Whether messing with race engines or wildcats, fit is pretty critical..... |
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Posted: 6/6/2010 2:14:19 PM EDT
[#12]
Got a chance to run a couple loads with the 110 Accubond today.....just ran the one powder but have a couple more to try.....
Reloading data for comparison ( use at own risk ) 110gr Accubond, 30gr 2230 = 2,740 fps avg. 110gr Accubond, 31gr 2230 = 2,780 fps avg. Quoted:
Reloading data for comparison ( use at own risk ) 90gr TNT, 28gr 2230 = 2,550 fps avg. 90gr TNT, 30gr 2230 = 2,750 fps avg. 90gr TNT, 32gr 2230 = 2,950 fps avg. 90gr TNT, 32.5gr 2230 = 3,010 fps avg. 95gr TTSX, 30gr 2230 = 2,795 fps avg. 95gr TTSX, 31gr 2230 = 2,880 fps avg. 95gr TTSX, 32gr 2230 = 2,925 fps avg. 90gr TNT, 28gr 1680 = 3,075 fps avg. 90gr TNT, 29gr 1680 = 3,120 fps avg. 90gr TNT, 29.6gr 1680 = 3,155 fps avg. 95gr TTSX, 28gr 1680 = 3,050 fps avg. 95gr TTSX, 28.6gr 1680 = 3,106 fps avg. 95gr TTSX, 28.8gr 1680 = 3,118 fps avg. |
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Posted: 6/6/2010 6:47:01 PM EDT
[#13]
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Quoted:
Excellent .
I really want to try these in your other variant. You did some work to get the AA under the TRX? (could also be pertinent to my interests) This is a pic of the carbine set-up.....the spacing works out so a BUIS can straddle the two and lock them together....works pretty good, doesn't seem to have any negative impact on accuracy, still shoots at an inch..... http://media.ar15.com/media/viewFile.html?i=19158 You are an invaluable resource , Kurt. I didn't think these were even compatible. 
My TRX is a middy , so I'm stoked ! |
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Posted: 6/6/2010 9:21:48 PM EDT
[#14]
excellent, Kurt.
Sounds like you are putting those TTSX's to good use. Where did you seat them? In the SPC, I seat the gas ring into the case mouth, and the bullet is fully supported. That gets me right to 2.295" With Reloder 10X, I have hit 2980 FPS with the 95 TTSX, in the 43mm case, using a 20" barrel. |
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Posted: 6/7/2010 6:01:10 AM EDT
[#15]
Quoted:
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Quoted:
Excellent .
I really want to try these in your other variant. You did some work to get the AA under the TRX? (could also be pertinent to my interests) This is a pic of the carbine set-up.....the spacing works out so a BUIS can straddle the two and lock them together....works pretty good, doesn't seem to have any negative impact on accuracy, still shoots at an inch..... http://media.ar15.com/media/viewFile.html?i=19158 You are an invaluable resource , Kurt. I didn't think these were even compatible.
My TRX is a middy , so I'm stoked ! Thanks, I appreciate it... I'm gonna need to find a corporate sponsor to keep up all this experimenting :o) The AA piston system should work great with your 6.8 if that is the direction you are heading. The 6.8 on the .223 case is by far one of my favorites, 85 TSX and 90 TNT make for some nasty medicine. Posted Via AR15.Com Mobile |
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Posted: 6/7/2010 6:59:03 AM EDT
[#16]
Quoted:
excellent, Kurt.
Sounds like you are putting those TTSX's to good use. Where did you seat them? In the SPC, I seat the gas ring into the case mouth, and the bullet is fully supported. That gets me right to 2.295" With Reloder 10X, I have hit 2980 FPS with the 95 TTSX, in the 43mm case, using a 20" barrel. When the 6.8 ARk was laid out I wanted to be able to stay between 85 And 110s...I've found that the fat brass likes to be held a little shorter to Aid the feeding, so the loaded length is kept around 2.240 to 2.250 depending On the bullet...the chamber was cut accordingly so it all works out... The 95 TTSX is set with the space between the rings at the casemouth.... I didn't get a chance to run any of the 85 TSXs yet but they should be pretty hot.. I really like the 2230 in this case size and had thought about building a 20" To get a little more out of it, but too many projects... Thanks, Kurt Posted Via AR15.Com Mobile |
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Posted: 6/7/2010 7:02:05 AM EDT
[#17]
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That is definitely going to do work.... Right now it's running a little more than 200 fps than my SPC....so it should extend the expansion range by about 150 yds.....gonna do some field work to calculate an actual BC at 3,000 fps.... when I did the match for 200 extra FPS it should give you 75 yards more of expansion range... but if the BC is better then what is advertised you may get more... What bolt are you running with the ARK? are you having any issues with running loads to 55K or so pressure? I don't think the BC is gonna get much better, they get to .277 pretty quick......It's closer to 300 before seeing .001 casehead growth on both cartridges but at 200 using a .295 BC and 1,700 expansion....yep, 487 vs 412...75 yds....at 300 it's 15 or so yards more..... I've been using Oly x39 bolts.....have around 800 rounds on the 7mm and about 400 on the 6.8.....no probs...... I ran two loads hotter than what was posted before seeing .001 casehead growth, so the celing is a little higher.....The Lapua brass is pretty stiff, but if it's allowed to move....it will... Whether messing with race engines or wildcats, fit is pretty critical..... That is odd you can only get that out of the 110 with my 68 in my 1-12 20 inch I average 2833, and I could push it a little harder but wasnt seeing a big increase so kept it down to that. I havent been able to test the 95TTSX's yet so I dont know what i can get with that. the TTSX will (should) expand down to 1600 FPS so that gives you a little more leeway. |
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Posted: 6/7/2010 7:38:18 AM EDT
[#18]
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That is definitely going to do work.... Right now it's running a little more than 200 fps than my SPC....so it should extend the expansion range by about 150 yds.....gonna do some field work to calculate an actual BC at 3,000 fps.... when I did the match for 200 extra FPS it should give you 75 yards more of expansion range... but if the BC is better then what is advertised you may get more... What bolt are you running with the ARK? are you having any issues with running loads to 55K or so pressure? I don't think the BC is gonna get much better, they get to .277 pretty quick......It's closer to 300 before seeing .001 casehead growth on both cartridges but at 200 using a .295 BC and 1,700 expansion....yep, 487 vs 412...75 yds....at 300 it's 15 or so yards more..... I've been using Oly x39 bolts.....have around 800 rounds on the 7mm and about 400 on the 6.8.....no probs...... I ran two loads hotter than what was posted before seeing .001 casehead growth, so the celing is a little higher.....The Lapua brass is pretty stiff, but if it's allowed to move....it will... Whether messing with race engines or wildcats, fit is pretty critical..... That is odd you can only get that out of the 110 with my 68 in my 1-12 20 inch I average 2833, and I could push it a little harder but wasnt seeing a big increase so kept it down to that. I havent been able to test the 95TTSX's yet so I dont know what i can get with that. the TTSX will (should) expand down to 1600 FPS so that gives you a little more leeway. The rain shut me down before I got to run all my loads :o( Still have one more 2230 load to run, and a few other powders to try....just started with what I thought would be the most mild out the shoot... The 7mm ARk will run a 110 over 3,000 reliably out of a 18 so with the bore reduction, who knows, maybe 2,900 ~ 2,950 Not sure what the gain would be going from a 18 to a 20 with the 2230 loads, I'd guess about 50fps ??? Posted Via AR15.Com Mobile |
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Posted: 6/8/2010 5:23:43 PM EDT
[#19]
Quoted:
We're running them in the 6.8ARk cartridge....the loads are coming along and look like they should make one hell of a game load....set them up in one of our test rigs with a 18" 1:11 .272 / .277 and Adams Arms mid-length piston system.... Is that a .272" Land / .277" Groove spec? If yes - very interesting solution to reduce pressure and increase velocity. Is there an existing caliber that you got this idea from (.0025 land heights)? |
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Posted: 6/9/2010 6:37:00 AM EDT
[#20]
Any idea of what your chamber pressures are doing with that round?
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Posted: 6/11/2010 9:15:55 AM EDT
[#21]
Quoted:
Any idea of what your chamber pressures are doing with that round? QL sugest that much 1680 in the grendel case with the same weight bullet is 69-70K psi. The case is opened up from .264 - .277 though & the 11twist brl helps. |
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Posted: 6/11/2010 9:41:10 AM EDT
[#22]
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Any idea of what your chamber pressures are doing with that round? QL sugest that much 1680 in the grendel case with the same weight bullet is 69-70K psi. The case is opened up from .264 - .277 though & the 11twist brl helps. That's sort of high for the AR-15 bolt isn't it? 1680 works well but I'm wondering if its too fast for that round. Its too fast for the 6.5 Grendel and not recommended by Accurate techs. Its fine for standard 7.62x39 loads though. 1680 is a copy of the powder pulled from captured enemy rounds in Viet Nam. |
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Posted: 6/11/2010 2:05:13 PM EDT
[#23]
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Any idea of what your chamber pressures are doing with that round? QL sugest that much 1680 in the grendel case with the same weight bullet is 69-70K psi. The case is opened up from .264 - .277 though & the 11twist brl helps. That's sort of high for the AR-15 bolt isn't it? 1680 works well but I'm wondering if its too fast for that round. Its too fast for the 6.5 Grendel and not recommended by Accurate techs. Its fine for standard 7.62x39 loads though. 1680 is a copy of the powder pulled from captured enemy rounds in Viet Nam. I don't think it's that high, but that's the number that's been thrown out there so it will probably stick....the larger bore and short lands help with letting the pressure not linger around for very long..... Some people like 1680, some don't......I've had pretty good luck with it.... The goal with this project was to hit 3,000 fps using the 95 TTSX and 2230 powder......did it........the 18" barrel length wasn't selected by accident, so I've got a pretty good idea what kind of pressure it's running.....the extra 150 fps with the 1680 was langinappe, although the pressure spike would probably favor a 17" barrel a little more...... I've mentioned in other posts that I prefer the 2230 spherical powder in this size case.....you've got to stack the right amount of weight on top of it in the right length barrel to make it run.....It may be less than ideal, but I can live with 3,000 fps and 10 fps deviation..... |
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Posted: 6/11/2010 2:38:50 PM EDT
[#24]
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We're running them in the 6.8ARk cartridge....the loads are coming along and look like they should make one hell of a game load....set them up in one of our test rigs with a 18" 1:11 .272 / .277 and Adams Arms mid-length piston system.... Is that a .272" Land / .277" Groove spec? If yes - very interesting solution to reduce pressure and increase velocity. Is there an existing caliber that you got this idea from (.0025 land heights)? yep.....it worked out pretty good....believe it or not it was a take-off .270 winchester barrel that got cut up into what I needed....I thought it was pretty lucky to stumble across this out of spec barrel 
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Posted: 6/11/2010 4:06:46 PM EDT
[#25]
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Any idea of what your chamber pressures are doing with that round? QL sugest that much 1680 in the grendel case with the same weight bullet is 69-70K psi. The case is opened up from .264 - .277 though & the 11twist brl helps. That's sort of high for the AR-15 bolt isn't it? 1680 works well but I'm wondering if its too fast for that round. Its too fast for the 6.5 Grendel and not recommended by Accurate techs. Its fine for standard 7.62x39 loads though. 1680 is a copy of the powder pulled from captured enemy rounds in Viet Nam. I don't think it's that high, but that's the number that's been thrown out there so it will probably stick....the larger bore and short lands help with letting the pressure not linger around for very long..... Some people like 1680, some don't......I've had pretty good luck with it.... The goal with this project was to hit 3,000 fps using the 95 TTSX and 2230 powder......did it........the 18" barrel length wasn't selected by accident, so I've got a pretty good idea what kind of pressure it's running.....the extra 150 fps with the 1680 was langinappe, although the pressure spike would probably favor a 17" barrel a little more...... I've mentioned in other posts that I prefer the 2230 spherical powder in this size case.....you've got to stack the right amount of weight on top of it in the right length barrel to make it run.....It may be less than ideal, but I can live with 3,000 fps and 10 fps deviation..... The 6.5 Grendel runs around 50K PSI and a 50 beowulf is running 40K +/- running the same bolt face diameter that you are using. The 458 SOCOM is similar in PSI to the wulf IIRC. Its not that the case won't take it, its the shear forces with the bolt thrust you are concerned with. Some of the "super bolts" have no problem with the 60K range. I like 1680 a lot. I use it in my 45/70 and 50 Beowulf as well as some 454 Casull loads. I don't load for 7.62x39 any longer but 1680 was a favorite for that round. |
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Posted: 6/11/2010 4:50:38 PM EDT
[#26]
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Any idea of what your chamber pressures are doing with that round? QL sugest that much 1680 in the grendel case with the same weight bullet is 69-70K psi. The case is opened up from .264 - .277 though & the 11twist brl helps. That's sort of high for the AR-15 bolt isn't it? 1680 works well but I'm wondering if its too fast for that round. Its too fast for the 6.5 Grendel and not recommended by Accurate techs. Its fine for standard 7.62x39 loads though. 1680 is a copy of the powder pulled from captured enemy rounds in Viet Nam. I don't think it's that high, but that's the number that's been thrown out there so it will probably stick....the larger bore and short lands help with letting the pressure not linger around for very long..... Some people like 1680, some don't......I've had pretty good luck with it.... The goal with this project was to hit 3,000 fps using the 95 TTSX and 2230 powder......did it........the 18" barrel length wasn't selected by accident, so I've got a pretty good idea what kind of pressure it's running.....the extra 150 fps with the 1680 was langinappe, although the pressure spike would probably favor a 17" barrel a little more...... I've mentioned in other posts that I prefer the 2230 spherical powder in this size case.....you've got to stack the right amount of weight on top of it in the right length barrel to make it run.....It may be less than ideal, but I can live with 3,000 fps and 10 fps deviation..... ..........Its not that the case won't take it, its the shear forces with the bolt thrust you are concerned with. Some of the "super bolts" have no problem with the 60K range........... I am fully aware of shear forces and bolt thrust when laying out this type of wildcat......case geometry and bolt to extension fit go a long way to distribute the load across the chamber during ignition, reducing the bolt thrust....... If the brass is allowed to move....it will, and take the bolt with it.......sloppy chambers and poor fit are not my style...... |
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Posted: 6/12/2010 5:47:30 PM EDT
[#27]
Quoted:
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I am fully aware of shear forces and bolt thrust when laying out this type of wildcat......case geometry and bolt to extension fit go a long way to distribute the load across the chamber during ignition, reducing the bolt thrust.......
Quoted:
..........Its not that the case won't take it, its the shear forces with the bolt thrust you are concerned with. Some of the "super bolts" have no problem with the 60K range...........Quoted:
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Any idea of what your chamber pressures are doing with that round? QL sugest that much 1680 in the grendel case with the same weight bullet is 69-70K psi. The case is opened up from .264 - .277 though & the 11twist brl helps. That's sort of high for the AR-15 bolt isn't it? 1680 works well but I'm wondering if its too fast for that round. Its too fast for the 6.5 Grendel and not recommended by Accurate techs. Its fine for standard 7.62x39 loads though. 1680 is a copy of the powder pulled from captured enemy rounds in Viet Nam. I don't think it's that high, but that's the number that's been thrown out there so it will probably stick....the larger bore and short lands help with letting the pressure not linger around for very long..... Some people like 1680, some don't......I've had pretty good luck with it.... The goal with this project was to hit 3,000 fps using the 95 TTSX and 2230 powder......did it........the 18" barrel length wasn't selected by accident, so I've got a pretty good idea what kind of pressure it's running.....the extra 150 fps with the 1680 was langinappe, although the pressure spike would probably favor a 17" barrel a little more...... I've mentioned in other posts that I prefer the 2230 spherical powder in this size case.....you've got to stack the right amount of weight on top of it in the right length barrel to make it run.....It may be less than ideal, but I can live with 3,000 fps and 10 fps deviation..... If the brass is allowed to move....it will, and take the bolt with it.......sloppy chambers and poor fit are not my style...... I don't think I said or implied that you didn't. |
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Posted: 6/24/2010 1:28:22 PM EDT
[#28]
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..........Its not that the case won't take it, its the shear forces with the bolt thrust you are concerned with. Some of the "super bolts" have no problem with the 60K range........... Quoted:
I am fully aware of shear forces and bolt thrust when laying out this type of wildcat......case geometry and bolt to extension fit go a long way to distribute the load across the chamber during ignition, reducing the bolt thrust....... If the brass is allowed to move....it will, and take the bolt with it.......sloppy chambers and poor fit are not my style...... Quoted:
I don't think I said or implied that you didn't. Then you are preaching to the choir........ |
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Posted: 6/24/2010 2:15:21 PM EDT
[#29]
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..........Its not that the case won't take it, its the shear forces with the bolt thrust you are concerned with. Some of the "super bolts" have no problem with the 60K range........... Quoted:
I am fully aware of shear forces and bolt thrust when laying out this type of wildcat......case geometry and bolt to extension fit go a long way to distribute the load across the chamber during ignition, reducing the bolt thrust....... If the brass is allowed to move....it will, and take the bolt with it.......sloppy chambers and poor fit are not my style...... There are more people than just YOU and myself that are reading this. You may very well understand, I have no idea. others may not know what we're talking about. You take things too literally. |
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Posted: 6/24/2010 8:50:31 PM EDT
[#30]
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You take things too literally. Yep.....and in doing so, I literally pushed a 95 TTSX over 3,100 fps.....using the wrong powder, bolt, and barrel length..... Imagine what it could do if I put a little thought or energy into testing it 
I have new load data, but not in front of me right now... " I'm riding on a dolphin doing flips and shit " google it, i-tune it..... 
posted via Blackberry |
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Posted: 6/25/2010 7:53:36 AM EDT
[#31]
Full moon?
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Posted: 7/2/2010 4:54:20 AM EDT
[#32]
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So on the mid length TRX you didn't have to do any modifications to the rail itself to get the Adams Arms mid length gas piston to fit? Mid length went together fine with no mods.....set it up with a 8.755 gas system, from extension shoulder to gas block shoulder and it ended up having about 3/32" between the end of the rail and the gas block....the rail tunnel fit the piston rod fine, it's close but does not touch.....as would be expected with the piston system, alignment of everything is critical....runs flawless and clean.....one of the things I like about it is no rose colored bullets, meaning the hot DI gas doesn't get the chance to pre-heat the up coming bullet in the mag....makes for more consistant loads, not as much temp change.... Can u post this up in the Adams Arms forum lots of people would love to see this about the TRX rail. I am stoked that i found this resource. Thanks for showing us that this can be done!
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Posted: 7/2/2010 10:09:42 AM EDT
[#33]
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Full moon? naw.....it's called a tuna.... I know what you meant....overnight at platform Auger.....haven't had much luck with night pics..... |
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Posted: 7/2/2010 10:12:02 AM EDT
[#34]
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So on the mid length TRX you didn't have to do any modifications to the rail itself to get the Adams Arms mid length gas piston to fit? Mid length went together fine with no mods.....set it up with a 8.755 gas system, from extension shoulder to gas block shoulder and it ended up having about 3/32" between the end of the rail and the gas block....the rail tunnel fit the piston rod fine, it's close but does not touch.....as would be expected with the piston system, alignment of everything is critical....runs flawless and clean.....one of the things I like about it is no rose colored bullets, meaning the hot DI gas doesn't get the chance to pre-heat the up coming bullet in the mag....makes for more consistant loads, not as much temp change.... Can u post this up in the Adams Arms forum lots of people would love to see this about the TRX rail. I am stoked that i found this resource. Thanks for showing us that this can be done! Sure..... |
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Posted: 7/11/2010 6:25:25 PM EDT
[#35]
Thanks for posting that pic up in the Adams Arms forums I and others do appreciate that. I have another question for the Trx. rail install that you did.Did the drive rod have any clearance issues with the barrel nut? and if so did you have to open up the slot in the barrel nut to allow for the extra diameter of the drive rod verses a gas tube? Once again thanks for all of your help. |
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Posted: 7/11/2010 6:43:23 PM EDT
[#36]
Quoted:
Quoted:
Full moon? naw.....it's called a tuna.... I know what you meant....overnight at platform Auger.....haven't had much luck with night pics..... Would you guys stay on topic? This is tech, not general discussion. And stop taking everything so personal, its the internet here gentlemen. |
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Posted: 7/11/2010 7:34:04 PM EDT
[#37]
So if you can get this kind of velocity out of a 6.8 projectile using the same case as a Grendel, why can't a Grendel get there as well?
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Posted: 7/11/2010 9:11:22 PM EDT
[#38]
Quoted:
So if you can get this kind of velocity out of a 6.8 projectile using the same case as a Grendel, why can't a Grendel get there as well? case capacity to bore area ratio makes some larger bore/smaller case cartridges more efficient sometimes because a faster powder may be used. |
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Posted: 7/12/2010 4:31:48 AM EDT
[#39]
Quoted:
So if you can get this kind of velocity out of a 6.8 projectile using the same case as a Grendel, why can't a Grendel get there as well? Bigger diameter bullet is more efficient going down the tube. Piston effect. |
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Posted: 7/12/2010 4:49:37 AM EDT
[#40]
.3mm can make a 200fps difference?
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Posted: 7/12/2010 4:50:51 AM EDT
[#41]
Quoted:
Quoted:
So if you can get this kind of velocity out of a 6.8 projectile using the same case as a Grendel, why can't a Grendel get there as well? Bigger diameter bullet is more efficient going down the tube. Piston effect. See above. |
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Posted: 7/12/2010 5:01:48 AM EDT
[#42]
Quoted:
So if you can get this kind of velocity out of a 6.8 projectile using the same case as a Grendel, why can't a Grendel get there as well? Quoted:
case capacity to bore area ratio makes some larger bore/smaller case cartridges more efficient sometimes because a faster powder may be used. Comparing a similar weight bullet and barrel length, the Grendel with the 95gr V-Max can be driven around 2,900fps out of a 18" barrel......this performance is based on using off the shelf components.....the design of the chamber, fit of the action components, chamber to case support, brass selection, and primer selection are some of the mechanical factors that can limit velocity along with the ballistic factor that Harrison described before a point of failure is reached..... From their inception, the 6.8 and 7 ARk were designed to be "hot-rodded" taking advantage of the optimized mechanical factors and improved interior ballistics.....it's all about finding combinations that compliment each other based on the limiting factors of the action..... |
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Posted: 7/12/2010 5:15:04 AM EDT
[#43]
Quoted:
Thanks for posting that pic up in the Adams Arms forums I and others do appreciate that. I have another question for the Trx. rail install that you did.Did the drive rod have any clearance issues with the barrel nut? and if so did you have to open up the slot in the barrel nut to allow for the extra diameter of the drive rod verses a gas tube? Once again thanks for all of your help. I didn't have any clearance issues with the barrel nut, as long as it is alinged correctly.......if it's off the slighest bit I could see where there could be problems with any barrel nut..... |
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