Ruger revolvers are designed and built a lot stronger than S&Ws so Ruger never complained about pressures being too high. However, it didn't take long to learn that Rugers would hold up much longer with reduced chamber pressure too. If you use the old reloading charts (rated in CUP) and load at the high end, it will not blow your gun up but it will certainly make it wear out faster. BTW, if you buy factory ammo made in Europe under their CIP pressure standards (Europe's version of SAAMI), they still maintain the higher pressure standards. Sellier & Beloit is one of the brands. Some of their 357 ammo is loaded to 43,500 psi and some of their 44 Mags are loaded to 40,600 psi. All US ammo manufacturers have changed to the lower SAAMI pressure ratings except a few like Corbon and Buffalo Bore. SAAMI still maintains the old CUP standards on the books but some day they will be phased out.
