I purchased some "minus" plug gauges from Travers Tool. Minus gauges are .0005" (that's 1/2 of a thousandth) under size. This lets a .515 gauge just slip into a .515 bore.
Buying them by the individual size wasn't as expensive as full sets. For the carbines, I have in .001" increments from .512 to .520...I think. These don't tell me the groove diameters, but I find it's easier to make these guns shoot as well as they can if you know where you're starting out.
I also got appropriate ones for 54, 58 and 69 caliber.
Bob Anderson
Ordnance Sergeant
Company C, 1st Michigan Volunteer Infantry
Small Arms Committee
"I won't be wronged. I won't be insulted. I won't be laid a hand on.
I don't do these things to other people, and I require the same from them."
- John Wayne in "The Shootist", 1976
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