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

**Mal H** · May 20, 2007, 08:36 AM

Eric - what is the diameter of the .45 Colt bullets? Some .45 Colt lead bullets are sold in .454" size for use in certain revolvers. Lead bullets for .45 ACP are almost always .451" or, more commonly, .452". The larger bullet will work ok, but you have to be careful about pressure. Obviously, the larger bullet will cause a higher pressure and you should back off from your normal load a bit until you know the load is safe for your gun.

In general, I think you're good to go.

May 20, 2007, 08:36 AM	#5
Mal H Staff Join Date: March 20, 1999 Location: Somewhere in the woods of Northern Virginia Posts: 16,955	Eric - what is the diameter of the .45 Colt bullets? Some .45 Colt lead bullets are sold in .454" size for use in certain revolvers. Lead bullets for .45 ACP are almost always .451" or, more commonly, .452". The larger bullet will work ok, but you have to be careful about pressure. Obviously, the larger bullet will cause a higher pressure and you should back off from your normal load a bit until you know the load is safe for your gun. In general, I think you're good to go.