Barrett Firearms Barrett Precision Rifle Ammunition 50 BMG 660gr Solid 2800 fps 10/ct. Encased in Barrett head-stamped brass every cartridge is loaded with noncorrosive powder and primers as well as a 660 gr projectile using state-of-the-art machinery. Ammunition is sold in 10-round boxes and 100-round cases. Package Contents: Barrett Precision Rifle Ammunition 50 BMG 660gr Solid 2800 fps 10/ct Barrett's 50 BMG Precision ammunition is ready for action. Encased in Barrett head-stamped brass every cartridge is loaded with noncorrosive powder and primers as well as a 660 gr projectile using state-of-the-art machinery. Ammunition is sold in 10-round boxes and 100-round cases. 19978