Stone Cold(good handle),I expect to take some flak for this, but I say if you have doubts about hitting a deer at 400-500 yards with your 7mm Rem Mag(my 7 Rem Mag launches a 140 ballistic Tip at 3300 fps)an Ultra Mag isn't going to help much.Adding 200-300 fps to a given bullet isn't likely to make it a "whole" lot easier,but every little bit helps.