I loaded a lot of 22 gt for one whole winter with n555 and the carbon ring was horendus! I could barely get though a 50 rnd ammo box and had to clean out the ring or I would get heavy bolt. Shot lights out until then though. I moved away from the 22 gt for that reason after that.
A friend of mine had the same trouble with the 22 gt with a different powder, I think it was 4831sc but not sure. He said after about 30 rounds he had to clean out the carbon ring. Probably a little slow powder for the cartridge and bullet combo but definitely a problem.
A friend of mine had the same trouble with the 22 gt with a different powder, I think it was 4831sc but not sure. He said after about 30 rounds he had to clean out the carbon ring. Probably a little slow powder for the cartridge and bullet combo but definitely a problem.