Well you didn't say what caliber it was, or what ammo you are shooting in it, but maybe I can help. I had a similar situation with both a 38-55 Win. & a 32 Win. Special. I quit using jacketed bullets and went to lead bullets which typically run a few thousands of an inch larger in diameter. That seemed to make the difference for me with the tired rifling in the barrel. It could grip the larger diameter lead bullet better than the smaller diameter copper jacket. Give it a try if you reload.
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