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Old August 17, 2021, 06:41 AM   #4
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Join Date: September 19, 2008
Posts: 988
Originally Posted by 603Country View Post
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…
I might think more easy to lead up the grooves with sub-optimal ammo choice.
Cleaning might well correct that.
All data is flawed, some just less so.
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