The Firing Line Forums - View Single Post - 200-yard "roundball" gun

FL-Flinter · June 15, 2008, 10:10 PM

Sarge,

It's more than likely a 13.5mm bore, most from Italy are simply because the common size reamer is easier to obtain (0.5315"). Nothing wrong with it and yes it's quite common for the Italian and some other foreign gun bore to run on the tight side but some run on the loose side too, .62 cal's usually measure out at 0.630" (16mm). Lyman .50 cal's have a 0.502" bore (12.75mm) Of course, none of this really means a hill-o-beans because you're fudging the fit with the patch anyway - the only time it really becomes an issue is when they run a 10mm reamer for a .40 caliber Which leaves the bore at 0.3937" and a 0.390" ball is difficult to get down even with a very thin patch.

June 15, 2008, 10:10 PM	#10
FL-Flinter Senior Member Join Date: June 24, 2007 Location: West Central Florida Posts: 207	Sarge, It's more than likely a 13.5mm bore, most from Italy are simply because the common size reamer is easier to obtain (0.5315"). Nothing wrong with it and yes it's quite common for the Italian and some other foreign gun bore to run on the tight side but some run on the loose side too, .62 cal's usually measure out at 0.630" (16mm). Lyman .50 cal's have a 0.502" bore (12.75mm) Of course, none of this really means a hill-o-beans because you're fudging the fit with the patch anyway - the only time it really becomes an issue is when they run a 10mm reamer for a .40 caliber Which leaves the bore at 0.3937" and a 0.390" ball is difficult to get down even with a very thin patch. __________________ "Carry the battle to them. Don't let them bring it to you. Put them on the defensive and don't ever apologize for anything." Harry S. Truman [email protected]