Has anybody determined the difference in pressures between 40sw, 9mm +P and 357 sig. How does that correspond to tolerances in the same pistol. I know a mid sized PD that had problems with 357 sig in Glocks made for 357 sig. Glock replaced pistols with 9mm para. The department lost faith in the 357 in the Glocks. Very likely it was an ammo problem, as the problem surfaced in range shooting. I didn't hear what quality of ammo was being used for the range. Makes some wonder in all of this high power ammo especially in polymer frames. I don't know the answer but some very well known pistol smiths have a problem with some of the existing ammo. I'm not familiar enough to make a statement but hope somebody a lot smarter than me has some info on the over all subject. Some pretty hot ammo out there now could be good. but how is it treating both older (not ancient) and some of the newer pistols???? A cracked frame is not good what ever the reason...