I was measuring a barrel for thickness.I was able to measure the inside at a marked location eight inches into the barrel of a 12 gauge and came up with .735 on the inside and used micromiter to measure the outside and came up with .850 ok so .850 - .735 = .115 I divide it by 2 and come up with .0575
Is that right.I hear you say .020 is too thin. Am I doing something wrong.
Is this ok?
Monty

monty