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RickB · January 19, 2005, 05:00 PM

All the modern ".45" pistol rounds shoot .451"-.452" bullets. Old .45 Colts shot .454", and the groove diameter of old Smith .45s was a big as .457", but everything from .45 Auto, to .454, to .460 Rowland, now uses .451"-.452".

January 19, 2005, 05:00 PM	#6
RickB Senior Member Join Date: March 1, 2000 Location: Boise, ID Posts: 8,518	All the modern ".45" pistol rounds shoot .451"-.452" bullets. Old .45 Colts shot .454", and the groove diameter of old Smith .45s was a big as .457", but everything from .45 Auto, to .454, to .460 Rowland, now uses .451"-.452".