What is a good target load for 357 pistol?

If you are asking for factory loaded ammunition recommendations then any generic loaded lead bullet will work for your needs. Any specific gun will have a preference for one brand / type or cartridge and this will vary with each gun.

If you are asking for a handload recommendation a 158 grain Lead Semi Wadcutter bullet that you load to a muzzle velocity of around 800-900 FPS is both economical and pleasant to shoot.