Bobpa,
I use H4350 in the 300 WSM for my best load. It is listed in Hodgdons data for the 270, 300, and 325 WSM. Pretty sure it can be a good powder in a 358 WSM too but I am not sure where to start. A starting charge for the 325 wsm with a 220gr is probably a safe with 200/225gr bullets in the 358 and I may try that. I have no doubt RL 15 is a good powder too. It is great in my wildcat 375 B&M which is a 300 ultra case shortened to fit in a Win Mod 70 short action with a slightly larger case capacity. Wish I could give better recommendation on those 2 powders but since it is wildcat we have to figure it out on own.
I second hoytcanon's recommendation to visit .35cal.com!!
J
