I notice that many cite overpenetration as a reason not to use 158gr .357 Magnum ammo. While this may be a problem with
some 158gr loadings (Federal 158gr Hydrashok and Speer 158gr Gold Dot come to mind) it isn't necessarily with others. Take, for example, this video:
http://www.youtube.com/watch?v=iqS3ixj-NtQ&list=PL858978D90283EA35&index=15
Just over 13" penetration and slightly over .65" expanded diameter seems just about perfect to me. The thing about powerful cartridges like .357 Magnum, 10mm Auto, .41 Magnum, and .44 Magnum is that for defense, you really don't need the latest high tech bullet. These cartridges have enough horsepower to throw a heavy enough bullet fast enough to reliably expand even with very dated JHP designs.
The reason that I like the Remington loading from that video (it's my .357 Magnum load of choice) is that the combination of a dead soft lead nose a reasonably high velocity makes it expand very reliably. In my own informal testing, I've gotten that same loading to expand to the point of jacket separation in a box of bone dry tool catalogs.
The reason that newer bullet designs often aren't preferable in a .357 Magnum is that, IMHO, they're
too tough (they're engineered this way to avoid fragmentation) and thus don't expand as aggressively as we'd like. What has been overlooked when designing these bullets is that a .357 Magnum has enough raw power that moderate fragmentation really isn't a problem so long as a heavy enough bullet is used. A 158gr .357" bullet has enough weight and cross-sectional density to penetrate adequately even after some moderate fragmentation and a full power Magnum loading provides it with enough velocity to expand very reliably.