So I'm basically just looking for a rough estimation of what sort of velocities I can use them at without leading. For instance will full power 38 and 44 special loads generally cause leading with this sort of projectile and what about full house 357 and 44 magnum loads?
Elmer Keith (ever hear of him?), used his famous cast lead bullet (plain base, no gas check) load of 22 grains of 2400, under Elmer's 250 grain bullet. That is a full house .44 magnum load.