Some where I read where the steel mod 49 was designed to fire 10,000 (158gr) rounds, half which could be at 900fps velosity, befor it had to go back to the factory to be checked out.
I do not have this data on record any more or do I remember the source where it came from...............sorry.

I fire a few 158 FBI loads in mine but they are reloads that chrony at 812fps..........not the hot 850fps plus Remington factory loads. However with the new bullet designs out,I have switched over to the 135gr Gold Dot that has less recoil and is a little easier on the J frame with a better expansion record and it meets the FBI requirements.

As for a Non+p SD load, I am still working on a 125 Jhp at 900fps or a 148 BBwc at 775fps that meets my requirments in accuracy,poa, expanion,penetration, recoil and follow up shots.

I don't have this problem with the 686.