Ian
Notorious member
A lot of lead fouling issues in automatics are due to.....believe it or not....trying to shoot bullets which are too large. You read that correctly. What happens is the throats are often short, small, and sharp and shave lead like crazy if the bullet is larger than the throat entrance and the brass has been sized to minimum in a carbide die so the brass rattles in the chamber like a BB in a boxcar. Gravity and/or extractor pressure cock the cartridge to one side, point the bullet at an angle to the bore center, and one whole side gets raked off on the abrupt edge at the end of the chamber and blown down the barrel behind the bullet.