Starline 308 Win Brass Cases (Large Rifle Primer) .308 Winchester, .308, 7.62mm Nato, 7.62x51mm The venerable .308 Winchester has made quite a name for itself since it was first introduced in 1952. The .308 and its military equivalent, the 7.62x51mm Nato, is a very efficient cartridge that has excellent ballistics, while still being fairly easy on the shoulder. That, and its inherent accuracy have kept it thriving as both a competition and hunting caliber. O.A.L.: 2.002-2.009 100 count by weight