I'd take a 500yd shot with my .270win before I would with my .300 win mag. reason being my .270 shoots far sub moa accuracy. and still woul dhave plenty of power at 500 for a deer, both shoot well, but that .270 would do the trick on a deer no prob.

Get a 7mm WSM then....

really a 7mm rem mag, .300 wm, .300 wsm any would do the trick.

.338 win mag...?