Having loaded for both I have found no real problems loading for 7 Mag vs the 06. But I have noted the following:
Brass cost more, or a little harder to beg off others.(One thing about reloading is trying to save a few cents here and there.)
Burns 10 to 24 more powder to achieve results.
Case life seems to be shorter.
Reguires Magnum primers.
=====================Results in higher overall cost.
Now here is an excuse to buy another rifle. I bought a .243 years ago to fight of attacking jackrabbits, coyotes, and groundhogs. This little sub-caliber
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is plesant to shot, and requires less powder, standard primers, and cases do not seem to be a problem. Of course I told my wife that I was spending the money to reduce ammo cost. I am sure she believed me. Practice with the .243 and the .22 rimfire helps tune me up for hunting season. Then when hunting season comes around use the 06 that you have also been getting some practice with.
Siskiyou