I’ve been reading military debriefings from the Soviet/Afghanistan War. It was mentioned, by Afghani Officers, that the .303 could penetrate Soviet Flak vests while rounds from the AK 47 and AK 74 could not. The .303 seems to have been preferred for some battle conditions. The Soviet Troops also had constant problems with fire control. The AKs were used to spray an area or target. Several times Soviet Commanders had to order the Troops to fire Semi-auto only to conserve ammo. During at least one engagement Soviet Troops were on the edge of victory but ran out of rifle ammo.