Posts: 460
Location: Northeast Louisiana
Joined: May 2012
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RE: 45 2 7/8 Groove Dia Patched
The best way to 'guage paper' if you're going to a store to buy locally is to stick a 1" Starrett Mic in your pocket and take a measure! Personally I use a thickness of .0018" for bore diameter using an as dropped bullet of .4460" diameter.