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I'll give you $55

Get it about avoiding reloads. Before you rebarrel, no harm or loss in trying a counterbore by an inch or two, best done by someone who knows what they're doing. May stop those tumblers.

Lead boolits may shoot straight in a worn bore especially with a fast powder and with heavy boolits at slower muzzle velocity. shooternz does those.

I'd try those before considering rebarreling or...