The Firing Line Forums - View Single Post - What is the difference between .45 Colt and .45 ACP Bullets

MADISON · May 24, 2007, 09:44 AM

If your .45 Long Colt was made before WW-II the diameter is .454.
After WW-II both .45 Long Colt and .45 ACP are .452 diameter.

May 24, 2007, 09:44 AM	#12
MADISON Senior Member Join Date: January 1, 2000 Location: Roanoke, Virginia Posts: 2,678	.45 Long Colt & .45 ACP bullet sizes If your .45 Long Colt was made before WW-II the diameter is .454. After WW-II both .45 Long Colt and .45 ACP are .452 diameter.