The s.S. ball projectile with a long 6° 25′ 51″ boat tail was designed for long range use and offered the best aerodynamic efficiency and external ballistic performance of any standard rifle bullet used during World War II, with a G1 ballistic coefficient between 0.593 and 0.557 (ballistic coefficients are somewhat debatable) or a ballistic coefficient of approximately 0.295 (G7). When fired at the typical muzzle velocity of out of a barrel the s.S. bullet retained supersonic velocity up to and past (V1000 ≈ Mach 1.07) under International Standard Atmosphere conditions at sea level (air density ρ = 1.225 kg/m3). It had a maximum range of approximately . Even by contemporary (2012) standards 1000+ m (1,094+ yards) effective supersonic range is quite remarkable for a standard military rifle round. For recognition the primer sealant was green, and it had a yellow-tip marked bullet.