I roll my own but for my factory .357 Mag stash is the Remington "scalloped bullet" 125gr JHP load. Good performer back in the day and still a "lightning bolt" round in my mind. Got a really good buy on PMC awhile ago and stocked up, on 158gr JHP that seems to be a good load for the standard 158gr bullet. With that said I think it would be hard to go wrong with most of the reputable manufacturers these days.
Stay safe people!