SIG SAUER MARKSMAN ELITE 5.56X45 NATO MATCH OPEN-TIP MATCH RIFLE AMMO When long-range accuracy is key, use Sig Sauer Elite Match Grade OTM ammunition to ensure the best shot possible. SPECIFICATIONS: Ammo Type: Open Tip Match (OTM) Caliber: 5.56x45 NATO Grain Weight: 77 Grain Test Barrel Length (in): 24.0 A 1/16 Muzzle Velocity: 2,750 fps Muzzle Energy: 1,293 ft-lbs Ballistic Coefficient (G1): 0.362 Bullet Length: 17.018 mm Case Type: Brass Mfg: Sig Sauer