300 Blackout ?

[30378]

Does anyone make an aftermarket barrel that is a 1 in 12, to 1 in 15 twist that is more suited specifically for light weight projectiles?

 

[rjacobs]

There is NO problem shooting light weight stuff in a 7 or 8 twist barrel.

What issue's do you foresee cropping up?

I have shot everything from 110g VMAX and Blacktips all the way to 240g SMK's in my 7 twist AAC barrel.

 

[NGCSUGrad09]

Twist rate is not the issue with a Blackout. It's the massive throat they put in it for subsonics. The accuracy of the supers suffers because there's a good amount of jump to the lands.

 

[wakajawaka]

I've 1/7", 1/7.5", 1/8" and a 1/10" barrels.

I see no advantage to the slow (relatively) twist barrels.

 

[30378]

I just want to get the velocity up. You can get more v with a slower twist bbl and I have NO intent of ever shooting heavies from a Blackout

 

[rjacobs]

I would post this over on 300BLKTalk where Robert Silvers from AAC is and see what his thoughts.

I dont think you would see any kind of appreciable increase in velocity personally. Maybe 50fps. Its not going to turn the gun into a real .308 velocity gun with the extremely small powder load.

I had a buddy that wanted to get a 20" 300BLK Barrel, but after research and question asking it was determined that the extra 4" of barrel wouldnt really do anything for velocity except maybe a VERY small change since the 16" barrel is even overkill from a powder burn perspective.

I dont think I would go any slower than 12 twist personally. Black Hole Weaponry has an 11 twist and they are polygonal rifling which the polygonal SHOULD help increase velocity slightly too.

 

[gunfreak101]

I just want to get the velocity up. You can get more v with a slower twist bbl and I have NO intent of ever shooting heavies from a Blackout

Than go with 6.8 . The whole purpose of 300 blackout is subsonic And you need 208 + for that I use smk220 for mine.