158 gr cast in .357 Maximum rifle

Anybody have a recommendation using WC820? I would like a load capable of taking deer or hogs. The rifle is an H&R SB2 Ultra with a factory chamber. I measured the twist at about 16" but may be slightly off. The only reason for picking 158 over 180 grains is that I've got a lot more 158 grain molds. Also have a bunch of WC820 - and this lot seems to burn right with AA9.

Reloader's Reference show a 13 grain load in the 357 Mag, but 20 grains of 2400 in the 357 Max - and 2400 should be just a tad slower than WC820, right? So start with 16 grains and work up? :confused: