The only problem with Mountain Guns is that they do not seem to make them now, according to the current catalog, unless you count the limited run 629 MGs made for Cabelas last year, and the odd 6 shot 686 MG made for Lipsey's a couple of years ago.
The best of the series is the 629 (all advantages of the Model 24, but in stainless steel and 44 Magnum) and the 686+ (7 shots, stainless, tapered barrel and the standard ejector shroud). The 686+ Mountain Gun should be a standard production item for another reason. It is the ideal medium frame Magnum, no heavier than a Model 19 or 66, but much stronger, with the round butt L frame and the offset locking notches making the cylinder much stronger.
Are you listening S&W?