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Posted: 4/21/2024 2:57:05 PM EDT
[Last Edit: vmpglenn]
6mm MAX is an AR15 sized wildcat based on a modded 350 Legend case. To shoot, you just swap barrels and get some 6MAX or 350 Legend mags. BCG remains standard 5.56.
Current info based on various podcasts, YT videos, and social posts: - standard barrel twist is 1:8, will stabilize 55gr - 107gr 6mm bullets - COAL spec is 2.300, so requires metal mags (standard AR15 magwell) - Duramag is making 6MAX mags, based on 350 Legend - 30rd mags are in testing, will be straight - Commercial round is 55k PSI just like .223, does not burn barrels because the round is not overbore - NATO-pressure round would be 57.5k PSI - 55gr 6mm bullet goes 3200fps out of a 10.5" barrel - 107gr 6mm bullet out of a 12.5" barrel is still supersonic at 1000yds (depends on atmospherics of course) - BC Precision can make 10k rounds a day by themselves - Starline is providing plenty of factory brass - SOLGW is making (offering, at least) factory ammo, one other unnamed company is also ramping up to make ammo - No plans for immediate SAAMI certification, but all testing to date has been done using SAAMI methods & standards - During testing, 77gr solid copper (machined) bullet penetrated NIJ LVL4 hard plate (no idea what barrel, shot inside a mobile ballistics lab in a standard sized 18-wheeler trailer) - AP rounds are in development (for mil applications) - BC Precision is gunning hard for some part of DoD to adopt the round |
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Posted: 4/21/2024 3:07:05 PM EDT
[#1]
Im cautiously optimistic about it
But this seems sketch: “55gr 6mm bullet goes 3200fps out of a 10.5" barrel” Where’d that info come from? |
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MI, USA
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Posted: 4/21/2024 3:30:47 PM EDT
[#2]
Quote HistoryOriginally Posted By ScoutH57: Im cautiously optimistic about it But this seems sketch: “55gr 6mm bullet goes 3200fps out of a 10.5" barrel” Where’d that info come from? Yeah, that’s 4-500fps over the same grain bullet in a 5.56 of the same barrel length. |
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Posted: 4/21/2024 3:55:12 PM EDT
[Last Edit: TonyRumore]
[#3]
OP quoted numbers for 55 and 107 grain bullets. Most hunters don't use either of those extremes.
How 'bout some numbers for old school hunting bullets. Like an 85 grain Nosler Partition, 90gr Accubond, 100gr Interlock etc? Tony |
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Posted: 4/21/2024 8:41:45 PM EDT
[#4]
Quote HistoryOriginally Posted By ScoutH57: Im cautiously optimistic about it But this seems sketch: “55gr 6mm bullet goes 3200fps out of a 10.5" barrel” Where’d that info come from?  SOLGW 6MAX VS. 5.56 |
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Posted: 4/21/2024 9:09:22 PM EDT
[#5]
Quote HistoryOriginally Posted By TonyRumore: OP quoted numbers for 55 and 107 grain bullets. Most hunters don't use either of those extremes. How 'bout some numbers for old school hunting bullets. Like an 85 grain Nosler Partition, 90gr Accubond, 100gr Interlock etc? Tony 
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Posted: 4/21/2024 9:27:24 PM EDT
[#6]
 24" test barrel numbers: 
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NC, USA
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Posted: 4/21/2024 9:41:53 PM EDT
[#7]
What's the case volume ?
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Posted: 4/22/2024 8:11:44 AM EDT
[#8]
Quote HistoryOriginally Posted By 9D1Alpha: What's the case volume ? 35gr water |
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Posted: 4/22/2024 8:53:57 AM EDT
[#9]
Quote HistoryCool beans. I'm hoping with SOLGW helping push it, it'll be successful. |
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NC, USA
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Posted: 4/22/2024 1:26:25 PM EDT
[#10]
Quote HistoryOriginally Posted By vmpglenn: 35gr water Quote HistoryOriginally Posted By vmpglenn: Originally Posted By 9D1Alpha: What's the case volume ? 35gr water Makes me curious of what could be had out of a 7mm TCU with 2gr more capacity at 2.615 coal and 10" bbl. https://loaddata.com/Cartridge/7mm-TCU-10-Inch-Barrel/492 |
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Posted: 4/22/2024 1:53:40 PM EDT
[#11]
Quote HistoryOriginally Posted By 9D1Alpha: Makes me curious of what could be had out of a 7mm TCU with 2gr more capacity at 2.615 coal and 10" bbl. https://loaddata.com/Cartridge/7mm-TCU-10-Inch-Barrel/492 AR308 sized round kinda moves away from the magic of a 6mm bullet charging hard out of an AR15. Just my opinion! 
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NC, USA
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Posted: 4/22/2024 2:40:56 PM EDT
[#12]
Quote HistoryOriginally Posted By vmpglenn: AR308 sized round kinda moves away from the magic of a 6mm bullet charging hard out of an AR15. Just my opinion! Quote HistoryOriginally Posted By vmpglenn: Originally Posted By 9D1Alpha: Makes me curious of what could be had out of a 7mm TCU with 2gr more capacity at 2.615 coal and 10" bbl. https://loaddata.com/Cartridge/7mm-TCU-10-Inch-Barrel/492 AR308 sized round kinda moves away from the magic of a 6mm bullet charging hard out of an AR15. Just my opinion! And that is an excellent opinion, sir . I admit to being a 6max skeptic but , I still find it interesting. |
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Posted: 4/22/2024 5:53:43 PM EDT
[Last Edit: TonyRumore]
[#13]
Quote HistoryOriginally Posted By vmpglenn: AR308 sized round kinda moves away from the magic of a 6mm bullet charging hard out of an AR15. Just my opinion! You guys both mixed up the 7mm TCU with the 7mm TC. The TCU is on a .223 case, the TC is on a 308 case. Tony Rumore Tromix |
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Posted: 4/22/2024 5:58:33 PM EDT
[Last Edit: campower]
[#14]
Wish I could get Into it, but it's just not going to live long with the popularity of the 6 and soon 22 ARC.
Brass is a problem since going from .35 to .24 neck requires more than one step down with dies, and probobly some neck turning involved as well. Geissele is making 6 ARC mags now, and I've found 350 Legend mags to be generally of low quality. At least the few I've tried. With the 6mmARC getting federal contracts, Geissele making magazines. Ruger making AR10s the size and weight of AR15s... Wildcat guys need to turn there attention for the SFAR now... Can we get magnum performance out of the Ruger? |
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Posted: 4/22/2024 6:08:35 PM EDT
[Last Edit: TonyRumore]
[#15]
Quote HistoryOriginally Posted By campower: Can we get magnum performance out of the Ruger? Not without a magazine that can handle .535" cases for more than a few rounds. Anytime you are wildcatting an AR, ALWAYS start with the magazine. If you can't come up with a suitable magazine, there is no need to waste your time making a barrel. Tony |
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NC, USA
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Posted: 4/22/2024 9:12:28 PM EDT
[Last Edit: 9D1Alpha]
[#16]
Quote HistoryOriginally Posted By TonyRumore: You guys both mixed up the 7mm TCU with the 7mm TC. The TCU is on a .223 case, the TC is on a 308 case. Tony Rumore Tromix Quote HistoryOriginally Posted By TonyRumore: Originally Posted By vmpglenn: AR308 sized round kinda moves away from the magic of a 6mm bullet charging hard out of an AR15. Just my opinion! You guys both mixed up the 7mm TCU with the 7mm TC. The TCU is on a .223 case, the TC is on a 308 case. Tony Rumore Tromix No , I was specifically talking about the actual TCU . I've looked at removing the coal restrictions of the std AR mag and utilizing it in the SFAR . 6x45 or 6-204 loaded out would be interesting as well . A std AR mag will fit inside a 308 mag with the 308 mag ribs milled out and the std AR mag catch bump milled off . I fully understand the mag issue . * with all due respect , sir . ( I love my 375 socom) |
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Posted: 4/22/2024 9:51:56 PM EDT
[#17]
Quote HistoryOriginally Posted By TonyRumore: Not without a magazine that can handle .535" cases for more than a few rounds. Anytime you are wildcatting an AR, ALWAYS start with the magazine. If you can't come up with a suitable magazine, there is no need to waste your time making a barrel. Tony So why don't we go shorter and fatter with a 30 RAR single side/stack magazine? I still say that was some of the best Ingenuity Rem had displayed. I currently own 2 and sold one shortly after release, and never ever once with a plethora of 30 cal loads/handloads from 110-175gr have one of them jammed. The left side feeding mag and huge feed ramp I'm sure play a huge roll. But why can't we just shorten a 28 Nosler or WSM case just a touch to seat VLD projectiles at AR10 mag length? Take me to school, Tony. I know you have thought about/tried this before. |
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NC, USA
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Posted: 4/22/2024 10:07:32 PM EDT
[#18]
Quote HistoryOriginally Posted By campower: So why don't we go shorter and fatter with a 30 RAR single side/stack magazine? I still say that was some of the best Ingenuity Rem had displayed. I currently own 2 and sold one shortly after release, and never ever once with a plethora of 30 cal loads/handloads from 110-175gr have one of them jammed. The left side feeding mag and huge feed ramp I'm sure play a huge roll. But why can't we just shorten a 28 Nosler or WSM case just a touch to seat VLD projectiles at AR10 mag length? Take me to school, Tony. I know you have thought about/tried this before. Quote HistoryOriginally Posted By campower: Originally Posted By TonyRumore: Not without a magazine that can handle .535" cases for more than a few rounds. Anytime you are wildcatting an AR, ALWAYS start with the magazine. If you can't come up with a suitable magazine, there is no need to waste your time making a barrel. Tony So why don't we go shorter and fatter with a 30 RAR single side/stack magazine? I still say that was some of the best Ingenuity Rem had displayed. I currently own 2 and sold one shortly after release, and never ever once with a plethora of 30 cal loads/handloads from 110-175gr have one of them jammed. The left side feeding mag and huge feed ramp I'm sure play a huge roll. But why can't we just shorten a 28 Nosler or WSM case just a touch to seat VLD projectiles at AR10 mag length? Take me to school, Tony. I know you have thought about/tried this before. You'd have to come up with a whole new bolt for that if using the SFAR . ..the bbl extension doesn't have much room either. .. |
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NC, USA
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Posted: 4/23/2024 11:10:40 PM EDT
[#19]
I think a key issue operating in the std ar15 envelope is sectional density and ballistics coefficient. 85gr gr 6mm bullets just get into the .200 sd realm for the 6max . With the case length BC probabaly isn't going to go above .450 ... 105-107gr are going to eat into the powder column quite a bit and/or the olive into the neck . You have 35gr h2o capacity , but that's not useful capacity . This is why I say I'm a skeptic , because it's just splitting more hairs and 9/10ths of its capabilities have already been done .
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Posted: 4/24/2024 7:29:39 AM EDT
[#20]
Quote HistoryOriginally Posted By 9D1Alpha: I think a key issue operating in the std ar15 envelope is sectional density and ballistics coefficient. 85gr gr 6mm bullets just get into the .200 sd realm for the 6max . With the case length BC probabaly isn't going to go above .450 ... 105-107gr are going to eat into the powder column quite a bit and/or the olive into the neck . You have 35gr h2o capacity , but that's not useful capacity . This is why I say I'm a skeptic , because it's just splitting more hairs and 9/10ths of its capabilities have already been done . You could probably ding any new cartridge, from 22ARC to 6.5PRC, for a variety of issues — including "been there, done that." I think 6MAX will fly or die based on marketing and industry support; for sure it's a better time to launch new ammo than it was in 2020 when 6ARC showed up. Having been a 6.5 Grendel shooter for a couple of decades, I've worked through the chamber, mag, gas curve, muzzle thread pitch (9/16x24? Ugh.), extractor, and other issues — and am looking forward to trying 6MAX to see if it performs right out of the box. I'm also encouraged that SOLGW is involved. |
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IL, USA
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Posted: 4/24/2024 9:11:27 AM EDT
[#21]
eatingpopcorn.gif
Interesting stuff going on with all of the 6.X calibers. I look at this and ask myself? Is it something that would have a place in the current US military? Is it something that is a substantial gain over what consumers have today? Using a 5.56 bolt is a good start. Looking at the two most successful "new" cartridges on the market, (6.5 Creedmoor and 300blk), one thing they have in common is that they used the same bolt and mag as .308 and 5.56, and if need be, can use the priors brass for new rounds. |
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NC, USA
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Posted: 4/24/2024 2:15:37 PM EDT
[#22]
Quote HistoryOriginally Posted By panthermark: eatingpopcorn.gif Interesting stuff going on with all of the 6.X calibers. I look at this and ask myself? Is it something that would have a place in the current US military? Is it something that is a substantial gain over what consumers have today? Using a 5.56 bolt is a good start. Looking at the two most successful "new" cartridges on the market, (6.5 Creedmoor and 300blk), one thing they have in common is that they used the same bolt and mag as .308 and 5.56, and if need be, can use the priors brass for new rounds. I see some utility in the short bbl performance. The 6max uses a proprietary brass that's only used in one other cartridge. |
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Posted: 4/24/2024 3:00:26 PM EDT
[Last Edit: smarcus]
[#23]
I would like to get excited but I don't see that it does anything better than 6.5 Grendel. When shooting lightweight ammo I'm getting just at 2700 fps with 105 grain factory Cavity Back Ammo out of an 18 inch Proof CF barrel at sea level, 59* out.
BC 0.48 FPS 2700 Weight 105 Temp 59 (YDS) (FPS) (FT.-LB) 0 2700 1700 50 2609 1587 100 2519 1480 150 2432 1379 200 2346 1283 250 2262 1193 300 2180 1107 350 2099 1027 400 2020 951 450 1943 880 500 1867 813 ETA: 1000 1224 349 Mils- 10.4 |
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USA
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Posted: 4/24/2024 4:13:52 PM EDT
[#24]
Quote HistoryOriginally Posted By smarcus: I would like to get excited but I don't see that it does anything better than 6.5 Grendel. When shooting lightweight ammo I'm getting just at 2700 fps with 105 grain factory Cavity Back Ammo out of an 18 inch Proof CF barrel at sea level, 59* out. If it feeds better, that would be nice, but you aren't going to get away from the limits of the platform. You run into a wall when you are talking full capacity double magazines, case capacity, pressure, bullet length, etc. on a standard lower and bolt/barrel extension size. You start trading extreme case shape vs.feed reliability and bullet seating depth/case length/ ballistic efficiency. It all ends up being being pretty similar with the trade offs being like the 6.8/6.5. Trade a little retained velocity for some feed reliability. |
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Posted: 4/24/2024 4:56:50 PM EDT
[#25]
Quote HistoryOriginally Posted By smarcus: I would like to get excited but I don't see that it does anything better than 6.5 Grendel. When shooting lightweight ammo I'm getting just at 2700 fps with 105 grain factory Cavity Back Ammo out of an 18 inch Proof CF barrel at sea level, 59* out. BC 0.48 FPS 2700 Weight 105 Temp 59 (YDS) (FPS) (FT.-LB) 0 2700 1700 50 2609 1587 100 2519 1480 150 2432 1379 200 2346 1283 250 2262 1193 300 2180 1107 350 2099 1027 400 2020 951 450 1943 880 500 1867 813 ETA: 1000 1224 349 Mils- 10.4 Yep, other than 6MAX has 30rd mags and uses standard 5.56 bolts. And that's coming from a serial Grendel builder/shooter. |
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USA
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Posted: 4/24/2024 6:03:56 PM EDT
[Last Edit: only1asterisk]
[#26]
Quote HistoryOriginally Posted By TonyRumore: You guys both mixed up the 7mm TCU with the 7mm TC. The TCU is on a .223 case, the TC is on a 308 case. Tony Rumore Tromix Tony, If you built the magazine directly into the magazine well could you load a single stack of 2.5x" long rounds, loading them like a Krag? 5-6 round would be plenty to hunt with. Quarter inch would expand options for several cartridges. |
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NC, USA
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Posted: 4/24/2024 10:38:40 PM EDT
[Last Edit: 9D1Alpha]
[#27]
The 80 - 87gr looks OK aesthetically, without too much down in the case . Needs a 100gr RN SP with a flat base... that'd have a sectional density of .242
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Posted: 4/27/2024 3:02:47 AM EDT
[Last Edit: AEROMechanic]
[#28]
None of this ammo available.... lol
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Posted: 4/27/2024 3:25:40 AM EDT
[#29]
Quote HistoryOriginally Posted By AEROMechanic: None of this ammo available.... lol https://bcprecisionballistics.orchidnow.com/products |
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Posted: 4/27/2024 5:55:39 AM EDT
[#30]
Quote History@vmpglenn Nice, thanks! I think if this cartridge is going to be a success though, there will need to be sub $1 per round offerings, to include steel case. |
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NC, USA
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Posted: 4/27/2024 12:44:29 PM EDT
[#31]
Quote HistoryQuote HistoryOriginally Posted By vmpglenn: Originally Posted By AEROMechanic: None of this ammo available.... lol https://bcprecisionballistics.orchidnow.com/products I'm gonna need to order a box of 85gr btsp for my collection! |
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Posted: 4/27/2024 10:23:10 PM EDT
[#32]
So what’s the expected barrel life for this cartridge?
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Posted: 4/27/2024 11:24:33 PM EDT
[#33]
Quote HistoryOriginally Posted By AEROMechanic: So what's the expected barrel life for this cartridge? I don't have Excel anymore, so try this out: https://bulletin.accurateshooter.com/2008/10/spreadsheet-formula-calculates-useful-barrel-life/ |
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Posted: 4/28/2024 12:43:40 AM EDT
[#34]
Quote HistoryOriginally Posted By HighpowerRifleBrony: Near the same, erring on slightly longer. About 17% more area and 16% more capacity. I don't have Excel anymore, so try this out: https://bulletin.accurateshooter.com/2008/10/spreadsheet-formula-calculates-useful-barrel-life/ Thanks |
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NC, USA
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Posted: 4/28/2024 10:24:46 AM EDT
[#35]
Quote HistoryOriginally Posted By HighpowerRifleBrony: Near the same, erring on slightly longer. About 17% more area and 16% more capacity. I don't have Excel anymore, so try this out: https://bulletin.accurateshooter.com/2008/10/spreadsheet-formula-calculates-useful-barrel-life/ Quote HistoryOriginally Posted By HighpowerRifleBrony: Originally Posted By AEROMechanic: So what's the expected barrel life for this cartridge? I don't have Excel anymore, so try this out: https://bulletin.accurateshooter.com/2008/10/spreadsheet-formula-calculates-useful-barrel-life/ To eyeball it a little closer, the 6max is 9% lower operating pressure of 5.56 NATO . |
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TX, USA
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Posted: 4/28/2024 11:02:20 AM EDT
[#36]
This is the first Im hearing about a 6mm max. Its got my interest, Ive broken two extractors on my 6mm Arc. Some mag issues, and other little quirks.
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MN, USA
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Posted: 4/28/2024 12:30:15 PM EDT
[#37]
Head to head with the 6 ARC, how much difference
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Posted: 4/28/2024 3:00:29 PM EDT
[#38]
Quote HistoryOriginally Posted By s4s4u: Head to head with the 6 ARC, how much difference Not much difference: 6ARC is optimized for 100gr+ bullets but operates at 50k PSI; 6MAX is optimized for 55-103gr bullets but operates at 55k PSI (NATO load would go 57.5k PSI) because it uses the standard AR15 boltface. |
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Posted: 4/28/2024 3:40:38 PM EDT
[#39]
Quote HistoryOriginally Posted By vmpglenn: Not much difference: 6ARC is optimized for 100gr+ bullets but operates at 50k PSI; 6MAX is optimized for 55-103gr bullets but operates at 55k PSI (NATO load would go 57.5k PSI) because it uses the standard AR15 boltface. I thought Hornady published data for both semi-auto 6 arc at 52k and 62k data for bolt guns... So in a bolt gun the 6arc will vastly outperform 6mmCracks. In a semi auto 6arc offers performance within 50fps from what I've seen published, and is backed by Hornady and Federal. 6maxx seems to be handloaders cartridge with a horrid process to make your own brass and one guy making brass for sale. Honestly gents, I love variants but this one just doesn't make one iota of sence to choose over 6ARC. |
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NC, USA
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Posted: 4/28/2024 3:49:40 PM EDT
[Last Edit: 9D1Alpha]
[#40]
Quote HistoryOriginally Posted By s4s4u: Head to head with the 6 ARC, how much difference It's closer to improved 6x45 . 107% 6x45 performance vs 84% of 6arc . * you could probably go to 6x45 Ackley Improved ( even use starline basic brass to skip fire forming) and whittle it down to 3% difference ...use 300blk mags for decreased taper . ** 6mm TCU dies |
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Posted: 4/28/2024 4:45:06 PM EDT
[Last Edit: vmpglenn]
[#41]
Quote HistoryOriginally Posted By campower: I thought Hornady published data for both semi-auto 6 arc at 52k and 62k data for bolt guns... So in a bolt gun the 6arc will vastly outperform 6mmCracks. In a semi auto 6arc offers performance within 50fps from what I've seen published, and is backed by Hornady and Federal. 6maxx seems to be handloaders cartridge with a horrid process to make your own brass and one guy making brass for sale. Honestly gents, I love variants but this one just doesn't make one iota of sence to choose over 6ARC. Starline is making the brass. If that's your idea of just one guy, I don't know what to tell you. Ammo is being made by SOLGW as well as a third company that has not been ID'd yet. I have no idea why you'd want to make the cases yourself unless you have a mountain of 350 Legend brass just sitting around. As for bolt guns, that's fine and all (I shoot a 6.5 Grendel bolt gun quite often) but the whole point of 6Arc and 6Max is to fit within the operating envelope of an AR15. 6ARC has its share of problems (see posts above) and 6Max hopefully solves some of these by using a standard 5.56 bolt and reliable* mags. * so far in testing |
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Posted: 4/28/2024 11:45:34 PM EDT
[#42]
Quote HistoryOriginally Posted By country_boy87: This is the first Im hearing about a 6mm max. Its got my interest, Ive broken two extractors on my 6mm Arc. Some mag issues, and other little quirks. What’s the brand of the bolt/build that had these issues? Component quality matters just as much as the cartridge for trying to source the issue. I’ve got a few ARC’s, and I’ve had zero issues with parts or feeding issues. I like the idea of more options (I still like my valkyries), but I’m struggling to see how this is a better mousetrap for a 6mm option in an AR. |
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MN, USA
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Posted: 4/29/2024 10:13:08 AM EDT
[#43]
Quote HistoryOriginally Posted By 9D1Alpha: It's closer to improved 6x45 . 107% 6x45 performance vs 84% of 6arc . * you could probably go to 6x45 Ackley Improved ( even use starline basic brass to skip fire forming) and whittle it down to 3% difference ...use 300blk mags for decreased taper . ** 6mm TCU dies TY, that was my thought looking at the case geometry. The Max is only slightly larger than the 6x45 even if it runs hotter. I don't see it as a real competitor to the ARC in terms of performance. |
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Posted: 4/29/2024 11:10:59 AM EDT
[#44]
Quote HistoryOriginally Posted By 9D1Alpha: It's closer to improved 6x45 . 107% 6x45 performance vs 84% of 6arc . * you could probably go to 6x45 Ackley Improved ( even use starline basic brass to skip fire forming) and whittle it down to 3% difference ...use 300blk mags for decreased taper . ** 6mm TCU dies Are we talking AR15 or bolt gun here? |
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Posted: 4/29/2024 12:06:00 PM EDT
[Last Edit: campower]
[#45]
Wait a second here, 6maxx is a rebated rim..
Yuck. I still have nightmares from my 22 Nosler rifles. With that, I'm out. Whoever decided to release and market this round in 2024 doesn't have social media or visit the local GS/matches much. This round won't even dent 6ARC sales. It's like a 6ARC but more expensive with no mainstream support, factory clambering (good luck with that) or any reputable testing to date. I think as .257 or maybe even 20 cal it would have at least been different. As is, it's a 6x45 that's a pain in the ass to aquire/make brass with just enough +fps to say "I'm better" but in real world applications, won't make a difference. |
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Posted: 4/29/2024 1:08:38 PM EDT
[#46]
Quote HistoryOriginally Posted By campower: Wait a second here, 6maxx is a rebated rim.. Yuck. I still have nightmares from my 22 Nosler rifles. With that, I'm out. Whoever decided to release and market this round in 2023 doesn't have social media or visit the local GS/matches much. This round won't even dent 6ARC sales. It's like a 6ARC but more expensive with no mainstream support, factory clambering (good luck with that) or any reputable testing to date. I think as .257 or maybe even 20 cal it would have at least been different. As is, it's a 6x45 that's a pain in the ass to aquire/make brass with just enough +fps to say "I'm better" but in real world applications, won't make a difference. The rim is rebated all of 6 thou around the circumference... |
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Posted: 4/29/2024 8:47:05 PM EDT
[#47]
Quote HistoryOriginally Posted By s4s4u: TY, that was my thought looking at the case geometry. The Max is only slightly larger than the 6x45 even if it runs hotter. I don't see it as a real competitor to the ARC in terms of performance. Quote HistoryOriginally Posted By s4s4u: Originally Posted By 9D1Alpha: It's closer to improved 6x45 . 107% 6x45 performance vs 84% of 6arc . * you could probably go to 6x45 Ackley Improved ( even use starline basic brass to skip fire forming) and whittle it down to 3% difference ...use 300blk mags for decreased taper . ** 6mm TCU dies TY, that was my thought looking at the case geometry. The Max is only slightly larger than the 6x45 even if it runs hotter. I don't see it as a real competitor to the ARC in terms of performance. 400 Legend as a parent case would have been better performance. |
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Posted: 4/29/2024 8:56:00 PM EDT
[#48]
Quote HistoryOriginally Posted By campower: I think as .257 or maybe even 20 cal it would have at least been different. As is, it's a 6x45 that's a pain in the ass to aquire/make brass with just enough +fps to say "I'm better" but in real world applications, won't make a difference. I want a nice 257 AR cartridge. 400L/6.8 as a parent case for a little extra umph. Would like it to fit this into an AR: https://bergerbullets.com/product/25-caliber-115-grain-very-low-drag-vld-hunting/ |
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NC, USA
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Posted: 4/29/2024 11:03:18 PM EDT
[Last Edit: 9D1Alpha]
[#49]
Quote HistoryOriginally Posted By Gamma762: I want a nice 257 AR cartridge. 400L/6.8 as a parent case for a little extra umph. Would like it to fit this into an AR: https://bergerbullets.com/product/25-caliber-115-grain-very-low-drag-vld-hunting/ Quote HistoryOriginally Posted By Gamma762: Originally Posted By campower: I think as .257 or maybe even 20 cal it would have at least been different. As is, it's a 6x45 that's a pain in the ass to aquire/make brass with just enough +fps to say "I'm better" but in real world applications, won't make a difference. I want a nice 257 AR cartridge. 400L/6.8 as a parent case for a little extra umph. Would like it to fit this into an AR: https://bergerbullets.com/product/25-caliber-115-grain-very-low-drag-vld-hunting/ I'd take the ruger 204 at 33.2gr capacity and 58ksi topped off with a .257 110gr eld-x loaded to 2.5x" . Stuff that in an SFAR . * no rebated rim - 33.2gr becomes more like 34gr when necked up ...58ksi is 7% hotter than 55ksi ( equivalent to 36gr ) - .465 bc and .238 sd with 110gr eld-x - more bore area than .243 for efficient short bbl use . |
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Posted: 4/30/2024 12:58:53 AM EDT
[#50]
Quote HistoryOriginally Posted By vmpglenn: The rim is rebated all of 6 thou around the circumference... He's a 6max hater. Don't mind him. |
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