Can someone please tell me if it is possible to swap the cylinder off of my 25-5 in 45 Colt, and install a 25-2 or 625 45acp cylinder, and be able to shoot acp's. I know you can't shoot 45acp in a 45colt cylinder.

I asked the same question a couple of weeks back. I was told, it is possible but probably cheaper to have the original cylinder machined to accept both 45 Colt and 45 ACP. You can watch the video @ TK Custom.com. Another is pinnacle-guns.com. I have yet to send mine, but I am planning to, soon!!
Good Luck!!

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NRA Life Member
AF&AM #129

The biggest problem (if it bothers you) is the side lug. If it's originally fit for .45LC, then a .45ACP cylinder will have lots of forward/aft slop when open. That said, I have successfully fitted both to the same gun.

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Chris
SWCA #2243 SWHF #292

The frame lug allowing the extractor to push the 25-2 cylinder so far back that the rear ends of cartridges would be behind the rear of the frame window isn't the worst problem. 25-5 cylinders are ".44 magnum length". 25-2 cylinders are shorter, being ".44 special length" on the front end and of course shorter on the back for head spacing with moon clips. Your 25-5's barrel would have to be set back to reach the 25-2 cylinder and after wards the 25-5 cylinder couldn't be reinstalled.

While some members are enthusiastic about machining the rear of .45 Colt cylinders so they can also fire .45 ACP in moon clips, creating long bullet jump is exactly the opposite of what you would do if your goal was to create an accurate .45 ACP. The conversion costs money and the converted revolver losses its entire collector value, so all in all, I think it's better to save your money until you can buy a second revolver.

I went the other way. Sent my 625 .45 ACP 3" to C&S and had them fit a .45 Colt cylinder to it (I think they still have some of the .45 Colt SS cylinders). It works out fine, and the cylinder swap is quick and easy. The only drawback (which I knew in advance) is that the cut down .45 Colt cylinder can accept any factory .45 Colt round, but if you load or get some of the boutique ammo, the LOA may be too long for the cylinder. The work was typical C&S, excellent, with any problems worked out before the gun was returned.
Of course as soon as I got the gun back I found a pair of 625 3" in .45 Colt, consecutive serial numbers no less! SO, now I have three.....

Thanks guys. It sounds like the best way to make it work is to buy another 45 colt cylinder and have it machined to use 45acp with moon clips.