First thing is give this bullet a whirl. It drastically out runs the 400,405,410 and 420 grains. The bearing surface is matched perfectly for the 480. The slightly shorter over all length lets it take the powder charges perfectly for the 370 CPB which is no longer made. Use Hodgdon's starting load and work up.
H110 or 296 will work fine but not with a reduced load. With about a grain off of max I use 155 Primers. I don't think you can get it cold enough for a problem as long as you are close to max and use a magnum primer. My SRH (new model) is shooting 1.5" 5 shot groups at 100 yards with the "little gun" load. I am very careful about shooting little gun. It is a matter of check the scope and hunt with it.