Thread: Best 7.62x39 subsonic loads and tips

The black stuff is only carbon and bullet lube, if the lube runs out before the projectile leaves the barrel you will get leading, check the muzzle
it should have a star shaped deposit of lube if so the lube is working properly, lead fouling starts out with little flakes of lead that get bigger
if not cleaned out with solvent soaked patches it ends up as long streaks of lead which are bastards to clean out