I think that if the .30-30 is all you have to hunt with, then it would make sense to go with a heavier bullet for bigger game. But for elk, I think you want to keep shots at 100 yards or less with the .30-30. However, given a choice, I would prefer to go with something more along the lines of a .30-06 class or larger caliber rifle for hunting animals larger and/or tougher than deer or if you are hunting somewhere that generally requires longer shots.
