I am interested with the PB platinum's as the claim is that they are harder than the copper jacketed and will likely give them a try on first the accuracy department and then if the accuracy is acceptable (to me), then try them in a hunting situation.
I was under the impression that Powerbelts tend to fragment at higher load levels because they are harder to begin with. This would make sense, as a softer bullet pushed at a higher load would tend to spread more, or at least common sense would say so. If the fragmentation is actually caused by hardness, I wouldn't bother using them. Something that claims to be harder than the original to begin with seems to offer itself up to more problems and more fragmentation issues.
Granted, my experience is not over the top with firearms, especially those used for hunting. So, if any of you guys with more experience can enlighten me and elaborate or disprove my theory please do so.