SIG SAUER MARKSMAN ELITE 308 WINCHESTER MATCH OPEN-TIP MATCH RIFLE AMMO Practice and competition rounds manufactured to exacting standards for more dependable, affordable accuracy. SPECIFICATIONS: Ammo Type: Open Tip Match (OTM) Caliber: 308 Winchester Qty Per Package: 20 Rounds Per Box Test Barrel Length (in): 24.0 A 1/16 Bullet Length: 30.988 mm Case Type: Brass Mfg: Sig Sauer, Inc.