There really isn't any issue with compressing ball powders--unless, like many did with the first .458 Winchester factory ammo, you're going to store it in hot places for quite a while.
You shouldn't have to compress any of the ball powders mentioned much. I've used 65-66 grains of Big Game with 286's for several years, and among the bullets has been the 286-grain Barnes TSX, probably the longest 9.3 286 made. Never had any problems.
