Is Blackhorn 209 powder ok for traditional percussion cap rifles? I've used only Pyrodex. And then there's Triple 7, which I've never used either. If BH and T7 are both ok, is it correct that pretty much the same number of grains in my powder measure (by volume) are equivalent for all three? So, the 70 grains of Pyrodex I often shoot is equivalent to 70 grains of the other two, or not? Want to try the other two. And I mean here the loose pouring version of these powders. Thanks.