Andy,

Did you get a lot of lead splatter with that extra 45 acp cylinder? If not I think I could locate an older large frame 45 Colt easier than an older large frame convertible.

I thought that the extra cylinder would have to be fitted to the specific Ruger revolver that you wanted to use it in. If I was gunsmith then that would be the thing to do. Unfortunately I'm at best a backyard mechanic, which means I would have the extra cost of having a smith fit the cylinder. This would probably not be cost effective for a shooter unless the cylinder doesn't have to be fitted.