I have a Tauras M454 in .454 Casull and the M617 7 shot .38/.357.

I've had the .454 since like the year after it came out, and the .357 about thre years now. Never a problem with either one.

The .454 is built like a tank.. I believe a few years ago They went to the same type of design for the .44 mag also.

I would agree for the most part about the .357, Should be "enough"
I would also second the .45 Colt if you felt "bigger is better". Loaded properly, it can approch low end .454 levels. (been there,, done that.)