H322 is a good powder but you should consider H4895 or Varget (I use both for 30-30 Win model 94 using Sierra 150 and 170gr FN). These powders, unlike H322, are designed to fire more consistently at extreme temperatures. I hunt primarily in PA where a good deer hunting morning may be 10 degrees. I think Hodgdon calls them the "extreme" line of powders, or something like that.