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Posted: 8/27/2019 2:17:46 PM EDT
[#1]
110 grain 300 blackout round
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Posted: 8/27/2019 2:19:20 PM EDT
[#2]
What caliber?
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Posted: 8/27/2019 2:20:26 PM EDT
[#3]
Quote HistoryQuoted:
What caliber? |
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Posted: 8/27/2019 2:21:12 PM EDT
[#4]
I would look at the lightweight TSX options.
https://www.targetsportsusa.com/barnes-vor-tx-223-remington-ammo-55-grain-tsx-hollow-point-lead-free-bb223r2-p-109455.aspx Spendy, but they perform well at the velocities seen in short barrel 5.56. 77TMK is generally a good performer, but I'm not sure on frag distance from such a short barrel. |
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Posted: 8/27/2019 2:23:20 PM EDT
[#5]
Quote HistoryQuoted:
Sorry about that. 5.56 |
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Posted: 8/27/2019 2:24:09 PM EDT
[#6]
Quote HistoryQuoted:
110 grain 300 blackout round |
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Posted: 8/27/2019 2:54:29 PM EDT
[#7]
Hornady 55gr sp will expand to ~.40 caliber and penetrate 13”-16” in gel at 1600fps impact velocity. Weight retention is ~60%.
1600fps impact gives an effective range from a 7.5” barrel (using a conservative 2400 fps muzzle velocity) of ~250 yards. I had a thread on it in which I shoot gel a while ago which is archived by now but if I find it I will link it. |
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Posted: 8/27/2019 2:55:31 PM EDT
[#8]
Quote HistoryQuoted:
110 grain 300 blackout round |
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Posted: 8/27/2019 2:56:11 PM EDT
[#9]
M193
ALWAYS M193 |
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Posted: 8/27/2019 2:58:15 PM EDT
[#10]
My latest AR pistol was a 4.75" 300blk. With the KX3, it's downright pleasant to shoot.
I put a CMMG .22 adapter in my 7.5" AR. It's just too punishing w/ 556 and offers nothing in exchange for the punishment. |
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Posted: 8/27/2019 3:04:30 PM EDT
[#11]
Kind of surprised nobody makes .223 or 5.56 optimized for an SBR. Or do they?
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Posted: 8/27/2019 3:09:53 PM EDT
[#12]
Hornady makes 1 or 2 SBR rounds but they still are pretty slow out of a 10.5" barrel. A barrel as short as 7.5 makes it very difficult to maintain rifle velocities out of 5.56
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Posted: 8/27/2019 3:10:04 PM EDT
[#13]
Quote HistoryQuoted:
That's like asking "I'm buying a Corvette and swapping in a 2.0L 4-cyl engine. How do I make it go fast in a 1/4 mile?" Sorry, but at that barrel length you're severely compromising the performance of that caliber. If you want to go that short, at least move up to something bigger in diameter. Quote HistoryQuoted:
Quoted:
Sorry about that. 5.56 |
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Posted: 8/27/2019 3:10:57 PM EDT
[#14]
Quote HistoryQuoted:
Hornady 55gr sp will expand to ~.40 caliber and penetrate 13”-16” in gel at 1600fps impact velocity. Weight retention is ~60%. 1600fps impact gives an effective range from a 7.5” barrel (using a conservative 2400 fps muzzle velocity) of ~250 yards. I had a thread on it in which I shoot gel a while ago which is archived by now but if I find it I will link it. |
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Posted: 8/27/2019 3:13:16 PM EDT
[#15]
Isn't the Blackhills 5.56 Barnes 50gr TSX supposed to be pretty good from a short barrel.
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Posted: 8/27/2019 3:14:13 PM EDT
[#16]
I'd change caliber to 300 BLK at that length
or .22LR |
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Posted: 8/27/2019 3:15:19 PM EDT
[#17]
For 5.56, the 55gr stuff works fine for me
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Posted: 8/27/2019 3:17:21 PM EDT
[#18]
 As stated, too short for 5.56...
My solution! |
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Posted: 8/27/2019 3:17:54 PM EDT
[#19]
I have the 7.5 in Marauder from PSA. I've put m855, xm193, 62, 55 grain wolf and Tula. Also some 77 grain something-or-other my buddy had. I couldn't hold much of a group off of a rest sighting it in at 25 yards. Maybe a 4-inch group. I was using a known good red-dot.
I had the first Barrel that came with it exchanged because of inaccuracy. The second Barrel was slightly better. I'm still minute of man at a hundred yards, maybe 8 inch group but as yet haven't been able to tighten the group's up. Can't speak to expansion at all. It is a very handy Blaster though and I do love it. I'm chaulking it up to user error at this point. I had a 10.5 and 16 in with me the day of and groups tightened up considerably as barrel length was added. I'm generally a pretty good shooter with a rifle. I guess it's the shorter Barrel that threw me off and magnified small movements I was making while squeezing. |
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Posted: 8/27/2019 3:21:01 PM EDT
[#20]
Quote HistoryQuoted:
https://www.AR15.Com/media/mediaFiles/3561/SBR-Low2-134332.jpgAs stated, too short for 5.56... My solution!  
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Posted: 8/27/2019 3:23:09 PM EDT
[#21]
Have you shot that Kitty Kat yet?
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Posted: 8/27/2019 3:24:04 PM EDT
[#22]
Quote HistoryQuoted:
110 grain 300 blackout round |
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Posted: 8/27/2019 3:24:21 PM EDT
[#23]
Quote HistoryQuote HistoryQuoted:
Quoted:
https://www.AR15.Com/media/mediaFiles/3561/SBR-Low2-134332.jpgAs stated, too short for 5.56... My solution!
https://www.AR15.Com/media/mediaFiles/138374/20190816_192647-1056864.jpg https://www.AR15.Com/media/mediaFiles/138374/20180729_181922-623222.jpg 
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Posted: 8/27/2019 3:25:02 PM EDT
[#24]
Quote HistoryQuoted:
Have you shot that Kitty Kat yet? 
Probably won't get a chance for a while. |
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Posted: 8/27/2019 3:26:07 PM EDT
[#25]
Quote HistoryQuoted: In that short of a barrel, why not subsonic? |
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Posted: 8/27/2019 3:28:50 PM EDT
[#26]
The various lighter CCI gold dots are pretty good out of short barrels. I'd start with the 55gr.
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Posted: 8/27/2019 3:46:44 PM EDT
[#27]
This thing eats M193 just fine. It's a little loud, though.
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Posted: 8/27/2019 4:09:05 PM EDT
[#28]
Quote HistoryQuoted:
I'd change caliber to 300 BLK at that length or .22LR |
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Posted: 8/27/2019 4:17:15 PM EDT
[#29]
Quote HistoryQuoted:
300 BLK... interesting thought. I have a Spike's Tactical/Multi lower, and since I have never attempted a build before, is that compatible for a 300 ? Quote HistoryQuoted:
Quoted:
I'd change caliber to 300 BLK at that length or .22LR I also think 7.5” is too short for 5.56. I would not go less than 10.3/10.5”. |
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Posted: 8/27/2019 4:18:25 PM EDT
[#30]
Quote HistoryQuoted: 300 BLK... interesting thought. I have a Spike's Tactical/Multi lower, and since I have never attempted a build before, is that compatible for a 300 ? Same everything else. |
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Posted: 8/27/2019 4:30:44 PM EDT
[#31]
I've got a 7.5" 5.56mm pistol. I already had 10.5" SBR and wanted something as compact as possible for travel.
I've killed two deer and at least a dozen coyotes with it up to about 100 yards. Federal 55 Grain TSX and Winchester 55 Grain Ballistic Silvertip, all DRT. |
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Posted: 8/27/2019 4:36:11 PM EDT
[#32]
Quote HistoryQuoted:
300 BLK... interesting thought. I have a Spike's Tactical/Multi lower, and since I have never attempted a build before, is that compatible for a 300 ? Quote HistoryQuoted:
Quoted:
I'd change caliber to 300 BLK at that length or .22LR 
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Posted: 8/27/2019 4:39:11 PM EDT
[#33]
Quote HistoryQuoted:
I've got a 7.5" 5.56mm pistol. I already had 10.5" SBR and wanted something as compact as possible for travel. I've killed two deer and at least a dozen coyotes with it up to about 100 yards. Federal 55 Grain TSX and Winchester 55 Grain Ballistic Silvertip, all DRT. |
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Posted: 8/27/2019 4:41:36 PM EDT
[#34]
Quote HistoryQuote HistoryQuoted:
Quoted:
Quoted:
I'd change caliber to 300 BLK at that length or .22LR https://i.ibb.co/XjYmvx9/IMG-3417.jpg https://i.ibb.co/Hp4y18w/69-D18232-425-F-4-F3-E-8148-B5-F02-ABF60-AF.jpg |
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Posted: 8/27/2019 4:44:25 PM EDT
[#35]
Quote HistoryQuoted:
That's impressive and dispels some notions I had about that bbl length for 556. Quote HistoryQuoted:
Quoted:
I've got a 7.5" 5.56mm pistol. I already had 10.5" SBR and wanted something as compact as possible for travel. I've killed two deer and at least a dozen coyotes with it up to about 100 yards. Federal 55 Grain TSX and Winchester 55 Grain Ballistic Silvertip, all DRT. But it's still coming out screaming: M193 with a 7.5" is still moving at 2,500 ft/s.  https://rifleshooter.com/2015/12/223-remington-5-56mm-nato-barrel-length-and-velocity-26-inches-to-6-inches/ |
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Posted: 8/27/2019 6:03:37 PM EDT
[#36]
Looks like I'll need to make space on the shelf for another caliber.....
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Posted: 8/27/2019 6:23:29 PM EDT
[#37]
I put this shorty together a year or two ago. I started it as a pistol and had it cerekoted while I waited on the Form 1. Seekins billet upper and lower, Odin Works 7.5" Barrel, Odin Works adjustable gas block, AAC can. When the Form 1 came in I had decided to keep the SB Tactical PDW setup. It runs well with 55 grain XM193.
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Posted: 8/27/2019 6:28:48 PM EDT
[#38]
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Posted: 8/27/2019 6:36:47 PM EDT
[#39]
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Posted: 8/27/2019 6:53:40 PM EDT
[#40]
Quote HistoryQuoted:
Looks like I'll need to make space on the shelf for another caliber..... If you aren’t going to mount a suppressor then an 11.5 to 12.5” 556 is pretty convenient and has enough Handguard to mount accessories and get a more forward grip on. |
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Posted: 8/27/2019 7:06:59 PM EDT
[#41]
Quote HistoryQuoted:
M193 ALWAYS M193 |
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Posted: 8/27/2019 7:51:35 PM EDT
[#42]
I've never had any mechanical issues with my 7.5. It feeds and shoots anything. Just don't get that delicious accuracy. I'm probably not the best shooter here though, I'm just a dude. Accuracy aside, that projectile is hauling ass when it leaves the barrel. A hell of a lot more effective than a pistol round.
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Posted: 8/27/2019 9:16:01 PM EDT
[#43]
OP do you already have a barrel?
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Posted: 8/27/2019 9:28:15 PM EDT
[#44]
Quote HistoryQuoted:
I've never had any mechanical issues with my 7.5. It feeds and shoots anything. Just don't get that delicious accuracy. I'm probably not the best shooter here though, I'm just a dude. Accuracy aside, that projectile is hauling ass when it leaves the barrel. A hell of a lot more effective than a pistol round. |
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Posted: 8/27/2019 9:34:26 PM EDT
[#45]
Quote HistoryQuoted:
I would look at the lightweight TSX options. https://www.targetsportsusa.com/barnes-vor-tx-223-remington-ammo-55-grain-tsx-hollow-point-lead-free-bb223r2-p-109455.aspx Spendy, but they perform well at the velocities seen in short barrel 5.56. 77TMK is generally a good performer, but I'm not sure on frag distance from such a short barrel. |
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Posted: 8/27/2019 10:30:44 PM EDT
[#46]
Quote HistoryQuoted:
Is it slower than from a longer barrel? Obviously. But it's still coming out screaming: M193 with a 7.5" is still moving at 2,500 ft/s. https://i2.wp.com/rifleshooter.com/wp-content/uploads/2015/11/m193-barrel-length-and-velocity-26-to-6-inches.png?w=667&ssl=1 https://rifleshooter.com/2015/12/223-remington-5-56mm-nato-barrel-length-and-velocity-26-inches-to-6-inches/ |
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Posted: 8/27/2019 10:40:19 PM EDT
[#47]
Built a 7.5" a while back. It lasted one range trip.
I did not chronograph it because I was afraid of busting the thing. It certainly will let you know which ammo manufacturer uses a flash retardant. Swapped the barrel out immediately for a 10.5" and a linear comp. Sold the 7.5" to some other gullible soul. |
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Posted: 8/27/2019 10:46:18 PM EDT
[#48]
Quote HistoryQuoted:
110 grain 300 blackout round |
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Posted: 8/27/2019 10:48:25 PM EDT
[#49]
My friend said the bullets will suck at 100 yards thru a 7.5" barrel. I asked if he would stand 100 yards away and I'll shoot at him so he can tell me how bad they suck. Never would.
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Posted: 8/27/2019 10:53:19 PM EDT
[#50]
Quote HistoryQuoted:
My friend said the bullets will suck at 100 yards thru a 7.5" barrel. I asked if he would stand 100 yards away and I'll shoot at him so he can tell me how bad they suck. Never would. |
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