That should be a no brainer. According to you, the N-frames aren't designed for it. #2, the .454, .480 and .475 shoot larger caliber, heavier bullets, which in my experience, is an upgrade in performance. All I've ever seen an increase in pistol bullet velocity do is flatten the trajectory slightly.
I humbly ask u to get out more and explore terminal ballistics. If u dont think theres a difference in wound channel bw a 280gr aframe at 1500 fps out if a 44 mag and a 300gr xtp at 1100fps out if a smith then u may need to do a little more hunting and experimenting. There are gunsmiths that will open up a 45 colt redhawk to a 454 casull and view it as safe. Theres nooooo gunsmith in the world thatll turn a smith 29 into a 454 and thats not because of cylinder length. Its the smith is in no way shape
Or form up to the task. The smith is one of the nicer actioned cheaper guns (i.e. removing FA from the equation) but its just not in the running for the podium in strength. One can easily beat a smith loose and use
Nothing but saami spec cartridges. I havent beat up a ruger enough in srh form to notice cramming whatever powder will fit i to the case thus far. Smiths are nice and rugers are strong and jack huntington can make the rugers just as nice but he, nor can anygunsmith make the smith 629 stronger!