They are all good choices. You can't go wrong with any of them, comments about .41 and .45 being better for the handloaders being correct, IF you don't mind the round-butt frame. That is where the 624 4" comes in for those of us who prefer the square-butt frame and like 44-caliber. I think it beats the Mountain Guns at their own game.

Of the three N-frame calibers, I like the .45 best. I find 44 difficult to shoot accurately with magnum loads. It can be done, but I don't enjoy it. The .41 is noticeably easier, but still a handful. The .45 seemed to handle "reduced" loads (i.e., normal .45 Colt factory loads) better than the other two and I thought it more than adequate for my needs with upper-level handloads (a 260-270 gr Keith bullet at 900-1000 FPS). But in the end, I preferred the square-butt gun and the 624 is the only one I have left. JMHO.