An interesting thread. I was not aware that guys were punching out their original m31, to 32 HR magnum, but maybe its a thing, somewhere.
Maybe little different, than shooting Plus P 38 loads, in an old non Plus P frame?
Most of us have done that, and still have the 5 issued fingers, each hand, and two eyes.
Guys way back punched Colt 38 special I frames to 357 I was pretty young then, but that is comparing an already way heavier frame, to a pocket size frame, any heat treating and metallurgy differences, unknown, to most.
I doubt Smith uses the same heat treat, on their Plus P guns, as they did on the older J frame models, but maybe?
I studied the Lee book, comparing max pressures, for the 32 long compared to the 32 HR mag.
Heck, the 32 mag pressure, behind a 90 gr, is ONLY 11,180 CUP HIGHER, than the Long....
I have little doubt, Keith and Sharpe, both took some guns apart, in their early days, making "magnums".
As my old compadre used to note, "until you have pierced a few primers, ya dont really know what the max load is"....
In life, we pays our money, and takes our chances.
Yeah, I wouldn't ream any old revolver from the early 20th century, but I wouldn't be afraid to ream one that is new enough to be marked with a model number - as long as it was a garden variety shooter and not something rare or pristine.