I shot a large bodied 8 pt whitetail at 258 yds in an open corn feild (Close as I could get, he poped up from a drainage ditch) with my Steyr L 6mm Rem. Bullet whent clear though rib cage and dropped him in his tracks. I dont think he would have dropped any faster with a 300 mag. Now could I pull that shot off with a heavy recoiling magnum ? probaly, but I shoot alot, I think if you can shoot a lighter caliber rifle much better than a larger caliber Magnum you should stick to the lighter caliber.