jesse - have your buddy sight that 30-30 in, dead-on at 50 yards... he'll be fine to about 120 or. Ideally, sight in so it is about 1/2 high at fifty, you'll be 'on' at around 140ish (depending upon bullet weight). How far do you expect to shoot?
for generally in-the-woods apps... a zero of fifty yards, or just a little high (<1" high) at fifty will do just fine.
check out
http://www.handloads.com/calc/