30 grains of 4198 or RL 7, will make about any rifle that's been around for a long time, into an equivalent of the good old 30/30, but with spitzer bullets....
30 grains in a 260, using any bullet weight, will equal my 6.5 Grendal using ANY bullet with a charge of 29 grains of W 748.
you can pick a round... OR pick a caliber and bullet weight, and then the appropriate powder. and get the same velocity with your powder choice....
ya don't need an 06 with a full power load to take down a deer.
