I agree with Sven re the 629MG - the X-frame Hogue monogrips really transformed it. I did like the sights and hammer & trigger of the standard production 4" 629, so I replaced my 629MG with a new production 4" 629 - fitted with the X-frame Hogues for Magnums.
In 9/02, my wife shocked me with a gift - a new 625-7 MG in .45 Colt - my first-ever own S&W! I loved it - and added another such MG - a 625-6 - as a backup/user, preserving the sentimental favorite. Both have had minor trigger jobs - and lighter Wolff springs installed, the latter marrying them to my Federal-primed homebrews. Both are fine at my power levels, 255gr LSWC and Speer 250 gr Gold Dots - tickling 900 fps max, sporting Ahrends square conversion or the S&W Dymondwood rounded fg-ed Combats, the latter making a great all-weather grip. I may, as I have done on some of my other plinkers, try a HiViz sight on one of them.
The 625MG was an evil purchase... it chased away the other .45 Colts in my collection (Rugers) - the last actually getting traded for it's sibling MG. Bliss. They are just fun! You have to make your own ammo - that's how I got started reloading, just two months after getting that original .45 Colt MG.
About moonclip conversions. Unlike a true .45 ACP-only cylinder, like my 625JM, a 'converted' .45 Colt cylinder must keep a vestige of the original thickness, a ring at the cylinder's outer edge, to catch the .45 Colt rim. Thus, a .45 Auto Rim, with it's thicker rim, will not fit. It will, of course, fit a standard .45 ACP cylindered revolver, like the 625JM. I load .45 Auto Rims with .45 Colt lead - and those GDJHPs mentioned earlier - at .45 Colt levels - so I can shoot no clip .45 Auto Rim .45 Colt-ish loads in a .45 ACP revolver.
I shoot lighter loads in .45 Colt cases to full loads - using a case volume/position insensitive propellant - Titegroup. It's greatest problem - you can easily overload that cavernous case! Be careful with Titegroup. I find this a better way - for me - than switching to shorter cases, like the .45 Schofields and .45 Colt Special, as it doesn't leave a potentially dangerous, with full .45 Colt loads, ring of carbon and lead. You must clean that from your chambers before loading .45 Colt loads - especially hotter loads. YMMV.
As far as woods-stomping... here in the southeast, if a 255gr LSWC at 870+ fps won't stop a thick skinned - or that 250gr Gold Dot at the same velocity stop a thin skinned - predator, you've obviously climbed over a safety fence at the zoo - get out quickly!
Stainz