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Old March 20, 2013, 09:54 AM   #10
Senior Member
Join Date: December 29, 2010
Location: Shoshoni Wyoming
Posts: 2,209
Nenewt, 20MM is .787"
I gave up on my math skills and ability to convert, and just went to my shop and measured it.
So a 20mm is a slightly loose 10 gauge. The "standard" for a 10 bore is .780

Last edited by Wyosmith; March 20, 2013 at 10:01 AM.
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