That's why I houseruled a "large caliber revolver"... to account for the .41 magnum (10.4mm), .44 magnum (11mm), .45 Long Colt (11.4mm), 454 Casull (11.5mm), and other such oversized revolver loadings.
I also did a "large caliber pistol" for similar semi-autos... 10mm magnum, .41 AE (10 mm), .44 automag (11mm), .475 Wildey magnum (12mm), .50 AE (12.7mm), etc.
If you want, I can post them.