STEADFAST .300 BLK 220gr TMJ Subsonic is constructed utilizing a Berry's Bullets total metal jacket, spire point projectile loaded in new brass casings.

Cycles most factory semi-auto rifles.

Velocity: ~1020 fps in a 16 inch bbl with 1:8 twist  / ~920 fps in a 16 inch bbl with 1:7 twist  / ~900 fps in a 10" bbl with 1:7 twist

Recommended for barrels with a twist rate of 1:8 or faster – e.g., 1:8, 1:7, 1:6, 1:5.
Slower twist rates (e.g., 1:9, 1:10) may under-stabilize the bullet and inhibit accuracy.