RE: AccuBond 180 for 300winmag
Well, RL22 is long and that is a seriously compressed load. I suggest IMR4350 myself or 4831sc. You won't have a problem so much with compression I think. Only problem with 4831 is it compressed too at 74gr.
Several techniques for compressed loads. pour your powder in very slowly in a swirling fashion. Might gain you some room.