I second you robert. It's one thing to want some extra punch for elk and or extra flat trajectory for deer. My problem with the big mags for deer... if you hit a shoulder on a broadside, you may take out both shoulders on the carry through and lose half your deer. And since for deer, ostensibly, the reason you use a mag is because you want to shoot waaaay out there, you have significantly increased the risk that you ARE going to hit a shoulder. That vitals shot off the shoulder is not all that big to begin with and if you start shooting 4+ inch groups at 400 yards or pull the shot even slightly......
Anyhow, I won't shoot 400 yards at deer in any event and I'm unashamed to say I don't shoot anywhere near enough to make it an ethical deal. Two years ago a guy in my party lost the whole front half of his doe he shot with a 7 mag, jellied both shoulders. He would have with an 06 too as it was an aweful shot, but the damage of the mags is awesome and I think uneccessary for deer. I also am of the opinion that there are but a handful of hunters in every 100 that have any business taking 300+ yard shots to begin with, and almost none of them are working from "factory ammo" . I don't discourage the ownership of any gun, I love em all. I'd go .270 for flat shooting deer round if you hunt at long distances and I'd leave the mag for the elk and bear.
Colville