A short-cut that often works is to seat 50 thou off the lands, then load a pressure series of one cartridge per grain and shoot through those until you find what seems to be your working maximum. Load 5 or 6 of those and see how they group; you might already be done. Hunting ammo is mostly about getting around the velocity that you expect, and shooting good enough. You could play with seating depths from there is you want, make big changes of 30 thou or so and see if something jumps out at you.
Barnes used to suggest something very similar if not exactly the same. Then there’s the millions of hunters hope that their factory ammo has somewhere around the expected velocity and shoots good enough. There actually is such a thing as good enough.