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**44 AMP** · April 28, 2007, 03:10 PM

.45 Colt guns normally had .454 groove diameter. Afterwards, it became normal for guns to have .452 dia. I have Ruger Blackhawks, and have never had any trouble with ACP bullets.

Check you loading dies, mike the expander. If it is .454", you might want to use the expander from a .45 ACP set, 'specially if you are going to load above plinker level.

April 28, 2007, 03:10 PM	#6
44 AMP Staff Join Date: March 11, 2006 Location: Upper US Posts: 28,822	Before WWII .45 Colt guns normally had .454 groove diameter. Afterwards, it became normal for guns to have .452 dia. I have Ruger Blackhawks, and have never had any trouble with ACP bullets. Check you loading dies, mike the expander. If it is .454", you might want to use the expander from a .45 ACP set, 'specially if you are going to load above plinker level. __________________ All else being equal (and it almost never is) bigger bullets tend to work better.