Some Questions--I've got a set of "Minus" Class ZZ Pin Gages so I can measure Cylinder Throats on my revolvers.

I detail cleaned the gun, scrubbed the cylinder with chore boy wrapped bronze brush to ensure all lead and gunk was out.

Then I started slipping gages through the cylinder charge holes. The .358 was no-go, the .357 was no-go, the .356 gage was a "Go".

So, is it fair to say with high confidence that the cylinder throats are .356? And -for best accuracy and least possibility of leading I should use cast lead bullets that measure .356?

What's the difference between Pin gages that are classified as "Minus" vs "Plus"?