Re: H870
That's a powder for the overbore mega-magnums such as the .300 RUM, .300-378 Wby, 7mm RUM, the various long-action Lazzeroni rounds, etc.
Might also work in the slightly more sane bore/case capaticy cartridges such as the .338 RUM, .338 Lapua, and maybe .50 BMG.