Quote:
Originally Posted by 603Country
Based on a one-rifle sample, my Dad’s Marlin 336C (bought about 1962 and never ever bore cleaned) had a 30/30 micro groove barrel that suddenly started shooting 5 gallon bucket sized groups. That suggests that maybe shallow groves rifling has a shorter use life. Maybe…
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I might think more easy to lead up the grooves with sub-optimal ammo choice.
Cleaning might well correct that.