I have a 340PD that I shot over 4000 rds before I ruined the cylinder face. I replaced it with a stainless and my father in law confiscated it and kept it. The round count on that one is nearing 5000 no problems. I estimate only 3 boxes of 38's were shot in that count. You will have to test 357 sd ammo, shoot 4 and look at the 5th round to see if its jumping crimp due to recoil. I have no problems with Speer or Hornady. I think the no less than 120 grn warning is only on the Ti cyl due to flame cutting the face. No warning on my 340SS or 360SS and I shoot 125's and 158's no trouble.