I was wondering if anyone has tried hogden hybrid 100v in a 375 Rum, 416 Rigby or Wby. It seems looking at the burn rate charts that it would be quite suitable for these cals. I guess that it isn't cost efficient, because of low volume, but manuals don't seem to have as much data on big bores. Since I want to spend some quality time with my big guns. I thought I would play with some different loads to create some of my own data. So if anyone has input on these cals. I would love to hear it. Also what powders are least sensitive to temp changes.