Suppressors 8.5" Barrel 300 Blackout Muzzle Pressures

[The King]

Does anyone know what the 300BLK 8.5" muzzle pressure would be with 110 Barnes (2100FPS) ammo?

 

[ddavis]

I asked this about 300 Whisper years ago when my POS carbon fiber suppressor blew up and someone with quickload punched in the numbers for me. I think it was ~8000 psi, or roughly the same as a 308 Win with a 24" barrel.

 

[The King]

Good info - I'm asking because my can is only rated to 14" 556...or 8100PSI or so.

 

[Shane C.]

Quickload says 13,500 psi if you can actually get that speed out of that short of a barrel.

fyi
A 14.5" AR is going to be a little over 14,000 psi at the muzzle, a 20" AR is just over 8,000 psi.

 

[itieknots7]

Good info - I'm asking because my can is only rated to 14" 556...or 8100PSI or so.

Liberty Mystic?

 

[The King]

Templar ARK30. Rated to a 14" 556. I have the brake edition which should help even more.

 

[Ring]

Good info - I'm asking because my can is only rated to 14" 556...or 8100PSI or so.

300 in a 556 can?

 

[Charger442]

No, his 30 cal can is rated down to 14" to shoot 5.56 as a sub caliber.


i was curious about his too. i have an ark30 i want to shoot supers through at that barrel length.

 

[ddavis]

I've heard from a guy that melted down a TTF can that he ran it for several hours off and on with a 10.5" full auto to the point of the internals rattling loosely inside. I won't say names but it made me feel much more confident that my Archangel will be just fine on anything less than full auto. Take it for what it's worth. 300 BLK has much less muzzle pressure than 5.56 at equal barrel lengths. I think TBAC has some info on this. Even though it's not their can, they could probably give you a good idea of muzzle pressures with 300 BLK vs. 5.56.

 

[The King]

I ended up shooting a bunch of Supers from the 8.5 with the Brake Attach non-SBR ARK30. 110 Barnes and 155 sierra's. It didn't give a shit about it. No damage to the can is evident.