as for casting 158 gr .357 bullet. rcbs, lyman, and or lee molds work well. i use them all, round nose/flat point/semi wad. for size go one size up on what your barrel slugs out to. as for powder coating i do the shake and bake powder coating. i size my powder coated pistol bullets after powder coating. my rifle bullets i size before powder coating, i put on the gas check while sizing then powder coat.