Well, there have been just SCADS of revolvers chambered for the .45 ACP cartridge, starting with the Model 1917 S&W's and Colts made during WWI to use the .45 ACP with a half-moon clip - the clips are needed to permit ejection of the empty cases, since the .45 ACP is a rimless round (not enough M1911's available in 1917!!). Otherwise, you'd have to eject the empties with a pencil or other "stick" There are a number of S&W Model 25 variants that are chambered for the .45 ACP, and you can even get Rugersingle actions that come with .45 ACP cylinders and.45 COLT cylinders which can be used intrechangeably. In addition, a great number of .455 Webley revolvers were made into .45 ACP guns by milling off a slice of the rear end of the cylinder so the .45 ACP could be used in them with the half-moon clips.

I believe that some ammo maker maystill making the .45 Auto-Rim case, which is the .45 ACP with a rim for use in .45 ACP revolvers instead of using the full-moon or half-moon clips.......