From the Shotguns board over at The Firing Line:
"28 gage - .550, 20 - .615, 16 - .662, 12 -.729, 10 - .775. 410 is of course .410"
Thanks for the dimensions on guage diameters. In contrast to the situation at Concord in which the various minutemen units lacked a central command, the unorganiezed militia in most, if not all, states have a command to which they can rally, e.g. the
New York Guard. I found the link 2 years ago in this story from
National Review that has some applicability today. I hope you find it interesting. It's what the governor's have left when their National Guard units are federalized and deployed overseas.