Moon Clips for Revolver Rounds

by
posted on August 19, 2014
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
wiley-clapp.jpg (2)

Most experienced handgunners know about the WWI half-moon (three-round) clips developed to adapt S&W and Colt revolvers to the rimless .45 ACP cartridge. In more modern times, Ranch Products came up with a full moon clip that holds six rounds in a circular unit which goes into the revolver cylinder as a unit. Originally, these clips were an expedient to permit service ammunition to be used in both 1917 revolvers and 1911 autos. There are some other advantages to this practice, particularly with the full moon types. Shooters have discovered speedier loading when they have only to fit one object—a loaded clip—into the cylinder. It’s better yet at the other end of the cycle when you push the ejector rod to dump the empties. If anything comes out of the cylinder, everything comes out—positive ejection. In recent years, the full moon clip idea has been applied to other auto calibers—9mm, .40 S&W and 10mm. It works very well.

But some unknown handgunner who liked the moon clip concept looked at some of the typical revolver cases. He had an idea that has really taken off. Look at a round of .38 Special ammo and consider how it fits in the revolver’s chamber. It has a rim that extends slightly beyond the diameter of the case body and which must fit perfectly flat against rear face of the cylinder. If there is any radius to the rim-to-body diameter transition, you may get misfires. Therefore, most cartridge manufacturers use a tiny little square cutter to cut a slight groove in the case body where it abuts the rim. This relief cut ensures a proper indexing of the case rim against the cylinder.

It is possible to use this groove to take a moon clip, made expressly for this purpose. A revolver thus equipped can be used with revolver cartridges for all the loading and ejecting advantages we have already described. The cylinder itself must be irreversibly modified, but you can get a bit more speed in loading and unloading. It’s an edge and sometimes “edge be everything.”

Latest

Chiappa 86 Wildlands AE TD 01
Chiappa 86 Wildlands AE TD 01

The Chiappa 86 Wildlands: A Modern Take On The Winchester 1886 Lever-Action

Chiappa has updated the nearly 150-year-old Winchester Model 1886 lever-action design with the 86 Wildlands Angle Ejection Takedown, giving it added versatility in the way of accessory-attachment points and optics-mounting.

Preview: White River Knife & Tool Ursus 45

The White River Knife & Tool Ursus 45 offers plenty of hand-filling area that is made all the more comfortable by way of well-shaped, replaceable burlap Micarta scales.

Gun Of The Week: Tisas PX-57 FO Raptor

Chambered for the unique 5.7x28 mm FN cartridge, the Tisas PX-57 FO Raptor is a polymer-frame handgun that provides a lot of capability in an affordable package.

The Armed Citizen® Oct. 10, 2025

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

Review: Smith & Wesson Spec Series V M&P 9 Metal HD

This latest enhancement from Smith & Wesson proves that good things can come from heavier, steel-framed packages.

Old Glory Bank, NRA Partner To Provide Banking Benefits To Members

Old Glory Bank and the National Rifle Association (NRA) recently entered into a joint marketing relationship to provide banking benefits to members of the NRA Business Alliance and NRA-affiliated clubs and associations.

Interests



Get the best of American Rifleman delivered to your inbox.