With subsonic the accuracy is about the same. With supersonic, 16 inch is more accurate.
We get 0.85 inch 5 shot group averages based on 50 rounds with 110 grain ammo in 16 inch 1:8 test barrels with the 300 BLK chamber. With 9 inch actual guns, more like 1.3 MOA.
For some reason the 110 grain Sierra and Berger bullets are most accurate. It seems to like short bullets. 112 grain benchrest bullets did awesome also. Not all guns like to feed the short bullets.
We get 0.85 inch 5 shot group averages based on 50 rounds with 110 grain ammo in 16 inch 1:8 test barrels with the 300 BLK chamber. With 9 inch actual guns, more like 1.3 MOA.
For some reason the 110 grain Sierra and Berger bullets are most accurate. It seems to like short bullets. 112 grain benchrest bullets did awesome also. Not all guns like to feed the short bullets.