Original sentence: Early ammunition was loaded with a 10.1 gram (156 grain) long round-nosed bullet (B-projectile) with a muzzle velocity of 700 m/s (2300 ft/s), while later rounds used a 9 gram (139 grain) spitzer bullet (D-projectile) with a muzzle velocity of 800 m/s (2625 ft/s)
Edited sentence: Early ammunition was loaded with a 10.1 gram (156 grain) long round-nosed bullet (B-projectile) with a muzzle velocity of 700 m/s (2300 ft/s), while later rounds(from 1941 onwards) used a 9.1 gram (140 grain) spitzer bullet (D-projectile) with a muzzle velocity of 800 m/s (2625 ft/s)