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Discussion Starter · #1 · (Edited)
I just picked up my 2nd #4 Mark 1, the first a Savage 2 groove and now this Maltby with a 5 groove?. The Savage bore is about a 6 on a scale of ten, the Maltby a 9.5. Were 5 groove barrels common on 1944 #4's?
How do I accurately read an oversize slug for groove diameter when a land is opposite a groove?
 
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