Ok, I will admit I hunt deer with "Elephant" guns!!!! Four have gone down to my .366DGW and this fall if all goes well and I finish my new rifle I will try to pop one with a .450 #2 Nitro express double I am building. The truth is I do not need that much power but I like hunting with those rifles. Believe it or not they do not do as much damage as you might think. Back to bullet construction again, the bullets for those big guys are rather tough and do not expand violently like smaller, faster bullets do. I will have more blood shot meat from my .308 Norma mag then from my .366 DGW even though it is pushing nearly twice the energy.
As for these "Super Mags", unless you need the longer range you might as well go for a big gun, there is a lot to be said for bigger frontal area of a bullet. If you think a 7mm or .30 super mag that has 4000 to 5000 foot pounds of energy kicks less then a .375 or .416 you are mistaken. Bottom line is if you have the energy you have the recoil and you would be suprised how flat shooting the big guys are. Besides the looks you get from people when they find out you hunt deer with a .416 Rigby are worth it. Pluss they usually want to hunt some where else so you have the woods to your self!