Originally Posted By: keith
Originally Posted By: shinbone


When I do a quick calculation using an average density for steel, the thickness of 60g of metal removed from the diameter of just one bore of these barrels would come to 0.072 thousandths. Meaning a negligible change in wall thickness from proof.


You might want to check your calculation again because .072" is .005" greater than the difference between a 12 gauge and a 16 gauge bore. That is hardly a negligible difference.


Yes, 60g off of 1239g is a 4.8% change, which I agree is not insignificant. Hmmmmm . . . .

The number I got was .072 *thousandths*, but I was a little rushed when I did the calculation and will recheck today.