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300 Blackout Barrel length #7769003 03/11/20 11:28 PM
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erathar Offline OP
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I'm currently shopping 300 uppers. What barrel length do you suggest for a suppressed upper? Thanks.

Re: 300 Blackout Barrel length [Re: erathar] #7769032 03/12/20 12:04 AM
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Pistol or rifle? I’d go as short as possible if I was suppressing it. 10.5 or so on a pistol, 16 on a rifle.


The very atmosphere of firearms anywhere and everywhere restrains evil interference. -George Washington
Re: 300 Blackout Barrel length [Re: erathar] #7769038 03/12/20 12:07 AM
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TexFlip Offline
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7.5"


Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: 300 Blackout Barrel length [Re: erathar] #7769056 03/12/20 12:19 AM
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300BLK is optimized for a 9” barrel, all the powder should be burned by that point. I run a 8” barrel with Chads SBR load. It’s a hammer on pigs within 150 yards.

[Linked Image]


[Linked Image]



Re: 300 Blackout Barrel length [Re: erathar] #7769098 03/12/20 01:11 AM
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I've been running 10.5" since 2015. These days a bit shorter is more popular, but they do require you run a pistol length gas tube, and un-suppressed that can sometimes be an issue.

[Linked Image]

Re: 300 Blackout Barrel length [Re: 9x19] #7769128 03/12/20 01:33 AM
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Originally Posted by 9x19
I've been running 10.5" since 2015. These days a bit shorter is more popular, but they do require you run a pistol length gas tube, and un-suppressed that can sometimes be an issue.

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300BLK was literally made to be shot with a pistol length gas system. So no there aren’t “sometimes can be an issue”. Only issue is people that can’t build an AR that will run.


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Re: 300 Blackout Barrel length [Re: erathar] #7769214 03/12/20 02:29 AM
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Here's some velocity numbers my 300 blk out ammo does in certain barrel lengths and rifles. The 300 blk out does not lose that much velocity when shortening the barrel. Not near as much compared to a 223/5.56, or other bottle necked rounds. I have 2 AR pistols, and both are 10.5". The 9"-11" is an ideal length for a handy AR. The LeHigh 78 grain bullet at 2602 fps would be NASTY on 2 legged critters (one AR pushes it at 2634 fps with the same load). I love the blk out, and it is much more powerful in a short AR than a 223 is. The 223 really needs a longer barrel for velocity, and I want more than a small 22 caliber for defense.

10.5" AR pistol
110 V-max= 2245 fps
115 Berger= 2235 fps
78 grain LeHigh= 2634 fps

16" bolt gun
78 grain LeHigh= 2796 fps
110 vmax-2420 fps
115 Berger= 2414 fps (2380 fps in 16" AR)
125 sst- 2356 fps


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