Agreed. Totally my fault! It is the old haste makes waste that spanked me. My fault.The powerbelts instructions actually discuss the need to monitor crud rings when shooting triple 7. They recommend wet patching bore between shots which I failed to follow. The incredible deal is the accuracy the powerbelts exhibited even out of a barrel that was so severely damaged.
Two things about "crud rings." First, they normally form down near the breech so you wouldn't expect them to cause a bulge near the muzzle in a good barrel. Second, they make loading hard but they are just powder residue so they shouldn't cause a barrel bulge either.
