I don't believe the .357 Magnum puts that much more stress on the frame than the .45 Colt, this just from my observations and experience.
The .357 Magnum is a high pressure round, to be sure. But I don't believe pressure, within reason, is that much of a culprit in revolvers. Certainly pressures can be elevated to the point that cylinders bulge or rupture, but pressures that are within the working limits of the cartridge are safely contained by the chamber walls.
From my experience, recoil is the greater adversary. Recoil causes battering of the internal parts and of the cylinder within the frame's "window" for the cylinder. All parts mush ahve some clearance, or "slack" for smooth operation. This slack results in battering of the components under recoil. And, heavy bullets contribute far greater recoil, such as the 255 gr. slug ov the .45 compared to the 158 gr. bullet of the .36 calibers.
Of the guns that I have had break down, most have been the big .44s and .45s. The only failures I have had with .357 Magnums were the stretched frame of my Colt SAA and the sheared off ejector rod housing screw of my Ruger Blackhawk. Most of my .44s have had the ejector rod housing screw shear off, not once but several times. Also, the ratchett has imprinted itself into the standing breech, requiring some stoning down of these parts. Bear in mind most of my guns have been fired in excess of 10,000~15,000 rounds.
AQnd, the Colt that failed had been customized to the point the topstrap had been weakened, and I had been shooting hot .357 Magnum ammmunition built around 175~180gr bullet weights.
Again I say, shoot that .357 Magnum SAA.