I put a Leupold vx-6 6x24mm-30mm-multicoated on mine!
Seriously though, the only scopes I have used on 30-30s have been straight 2.5 or 3X power. Had a 1.5-4.5 on one for a while, but never needed the high range, so went back to a fixed 3X.
I have several 2-7 Leupolds on rifles, and can see how one would be handy for judging deer in poor light, but never worried about that, and pretty sure anyone hunting trophy animals probably isn't hunting with a 30-30.
Having said all that, most of this is personal preference, and preferences change with experience. The important thing is to enjoy the experience!
Best,
Ted