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Old August 16, 2021, 06:25 PM   #3
603Country
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Join Date: January 6, 2011
Location: Thornton, Texas
Posts: 3,995
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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