Interesting idea
Okay, THAT's an idea worth research. Let me put that one on the pile.
My 625 was made in '89, so I KNOW the S&W boys would just
barf if they got this question, but there's very little engineering difference between my 625 and my 629 (44mag). I'll have to go check to see if the cylinder stops are in the same place and all that. I know that some boys with .45LC in their N-frames push way harder than factory loads, though I don't know of anybody foolish enough to try to pretend they're shooting Rugers or Contenders when they do that
(all of them still have all of their fingers). Caution is advised here.... big time....
Stay safe and don't do anything foolish....PLEASE.
I know my 625 will eat the hottest factory .45ACP without a belch, no surprise there. I'm not sure how far I'd want to tempt fate since we're talking way different pressures here, but the N-framed Smith was designed to deal with a whole lot more than the moderate pressures the ACP round generates. Whenever I load hot .45 ammo, I go ahead and stack it into the moon clips for the 625 so it doesn't get mixed up with what I'm feeding my M1911.
I'll go check my Smiths and my pressure tables and come back - meanwhile I'll watch this thread with interest....