The only .357 I carry .38's in is a 12 oz snubby j-frame--and that's because I experimented with it long enough to decide that I give up too much control with any real .357 load in that gun.
In a 2.5" k-frame, I carry a 125 gr XTP over enough Blu Dot to push it about 1250 fps.
In a 4" Security Six, I carry a 158-170 gr HP or SP bullet (most often it's for field carry) over a heavy load of Lil Gun.
In a 6.5" Blackhawk, I--well, I don't carry it---but I shoot whatever I want from the beast ;-)
Handloading affords the luxury of finding that balance-point of power and controllability--for each gun--with a little more precision.