.45 Auto Rim In .45 Colt

by
posted on April 25, 2014
qanda2015_fs.jpg (2)

Q. Can you safely shoot a .45 Auto Rim cartridge in a revolver chambered for a .45 Colt? A buddy of mine gave me some the cartridges, but I don’t have a gun in .45 Auto Rim. I do have a .45 Colt, though, and it looks like it should work.

A. I would not encourage anyone to attempt to fire a .45 Auto Rim cartridge in a cylinder chambered for .45 Colt. Aside from differences in the dimensions of the cartridge case, the Auto Rim round has a significantly thicker rim, approximately 0.090" versus approximately 0.060". This could certainly cause headspace and functioning problems. If the revolver in question is supplied with a separate cylinder specifically for the Auto Rim cartridge, there should be no problem. A number of firearm manufacturers have over the years offered .45 revolvers with dual cylinders, one for .45 Auto Rim or .45 ACP cartridges and one for .45 Colt.

-Reid Coffield

Originally published September, 2006

Latest

Burnside Carbine Ihtog 1
Burnside Carbine Ihtog 1

I Have This Old Gun: Burnside Carbine

In the American Civil War, there was an incredible variety of small arms used, particularly within cavalry units. One of the most popular cavalry carbines used throughout the war was the Burnside carbine.

New For 2024: Mossberg Patriot 400 Legend

Mossberg expanded its Patriot bolt-action rifle line to encompass one of the newest straight-wall hunting cartridges on the market: 400 Legend.

I Have This Old Gun: Norinco 84S

The Norinco 84S presents the same general appearance as the Chinese-made 56S because it has the same overall length, is built around a stamped sheet-steel receiver and uses the same hooded front sight base, the same 45-degree gas block, the same fire-control components, the same wood furniture and the same high-polish blued finish.

Rifleman Q&A: Boattail Bullets And Barrel Erosion

In the recent spate of “long-range” boattail bullets presented to the market, I’ve observed the boattail’s degree of departure from the bullet’s cylindrical axis varies substantially from one design to another.

Quick Hits On 10 6.5 mm Cartridges

With so many 6.5 mm cartridges from which to choose, deciding on the one that’s right for you can be a challenge—so here’s a quick guide to help sort them out.

The Armed Citizen® Feb. 19, 2024

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Interests



Get the best of American Rifleman delivered to your inbox.