Hey brian,
I use .430 when reloading my 444 with jacketed bullets.On loadswap, there are a couple of good loads with 265gr. and 300gr. Hdy. and Speer bullets. Both shoot very well out of my guns. You'll see a bunch of Hardcast loads that shoot as good if not better than jacketed bullets and are easier on the barrel. Always reduce data 10% and work up slowly watching for signs of too much pressure. Take care.
Walt