Hey fella's, I've got a buddy who is new to rifle shooting and he wants to get into long range shooting and hunting. We're talking 300-1000 yards. He's dead set on getting a 300 win mag. I've been trying to explain that he doesn't NEED a magnum of any flavor and that it'll be harder to learn (recoil & muzzle blast), and more expensive. I said if he absolutely needs a mag to look into a 7 rem mag or even 264 win mag but from people he's talked to at work the 7 kicks more than a 300 and the 300 won't be affected by wind as much as a 7 mag will. I tend to disagree with both statements. Im also new to long range shooting which is why i need your help! What would be ideal for shooting and hunting (whitetail & elk) at long ranges, say 400+ yard's? And between the 300 win mag and 7 rem mag, which is better overall and has the best selection of high BC bullets?

Thanks!
Cory