Vol;

Please excuse my error, I thought you stated .720". I should have gone back to original thread and read what you indicated.

I did not realize that the late John Foster marked his sleeved barrels. His work was good.

You are correct .724" is 18.4mm (actually 0.72440984"). I keep the inch conversion of a mm stored in my head 0.0393701" and I can use that number by changing the decimal point position for all the various metric measurements basis.