If its not coppering it could just be it doesn't like what your feeding it.
have you tried a few different projectiles and seating depths.?
A second hand barrel I have coppered,still shot ok but coppered.
I cleaned and shot cleaned and shot etc etc with no change.
Then cleaned spotless of copper and carbon and shot 10 blanks to carbon the bore and shot from there. Its been mint ever since![]()
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