I got my second 4" 625-8 - the very JM you referred to - in early 2/05, when they were released. In '07, the JM listed for $40 more, MSRP, than the 5" standard model. That's a steal, just for the easily changed front sight (I have the fiber 'HiViz optic front sight in mine today.). It also came with chamfered charge holes, for faster reloading moonclipped RN bullets, and the JM grip which I like. Mine came with an improved 'action', which I found basically to be just a ground strain screw, and hard-chromed hammer and grooved trigger. That latter attribute took DNA samples every time I shot it - until I 'eased' them with some emery cloth. The front sight is a gold-beaded Patridge, another nice touch vs the usual ramp. A versatile firearm. Google 'Ranch products' - 100 blued steel moonclips are ~$30 delivered. Imagine - all loaded up, you'd be ready for those stinking Zombies - 600 rounds! Do you know anyone with a bottom-feeder with that many rounds in magazines?
Pure big bore fun, with a frugal round. And, if you reload, or order from the likes of Georgia Arms, you can load up spme no-clips-required .45 Auto Rims. I load 255gr LSWCs, actually from my .45 Colt bullet stash, in those .45 ARs at ~880 fps - hotter than my .45 Colts from a similar 4" 625MG. Fun revolver. Don't like the recoil? Order some .500 Magnum grips from S&W Accessories ($35 + s/h).
Stainz