New guy here, Brad from Colorado.
I spoke with FA earlier this year about what load they used to test their .454's. I was told they use the Hornady 300 gr. XTP factory load. My load is 31.1 gr H110, just a few tenths of a grain less than that factory load but my gun shoots it a little more accurately than the 31.4 max load my Hodgden manual lists. I have yet to shoot anything big with this load but it's been hell on the marmots this fall. Last year I shot an elk with the 250 gr. Barnes factory load. It worked quite well. I used to shoot a .44 mag with 325 hard cast and they gave tremendous penetration on an almost 600 lb black bear.