Best advice I can give is only "second hand". I do not own, nor regularly shoot, a rifle chambered for 7 mm Rem. Mag. But I have 4 hunting buddies that do, and I have helped each one of them along the way over the years sight in their rifles at the range. And have hunted along side most of them for 20+ years ... mule deer, white tail and feral hogs.

As you probably know, every rifle is unique when it comes to which bullet and "load" groups the best. From my experience, unless you are good at hand-loading, the best route to go would be one of the so called "premium" loads. The guys I hunt with almost to the person use factory ammo loaded with bullets in the 150-175 gr. weight. Unless you plan to hand load, I'd try at least 3 different factory loads. Remember that the muzzle velocity of a 7 mm Rem. Mag. is blistering fast, so any close range shots will truly test a bullet's ability to hold together. Though a "bonded" bullet or something like a Partition might seem "too tough" for white tail, these sorts of bullets will at least mitigate fragmenting a on short range shots and almost always result in a pass though shot with a tremendous wound channel.