Are you measuring from the muzzle or the breech? Surely from the breech. The .020" minimum would be toward the muzzle I would think.

Either way .058" (.0575") is plenty.

Of course the bore may not be centered in the barrel so one wall could be thinner than the other. A wall thickness gauge is the only way to know for sure.

But you probably have plenty of wall thickness.

What gun are you measuring?

Best,

Mike


I am glad to be here.