I lean towards heavier bullets for deer with the .30-30. No good reason really, other than I like them.
I'll hazard a guess that probably more attention has been given to .30-30 bullet development over the course of the last century than most any other. Stands to reason- the last thing a bullet/ammo company wants is word getting around that their .30-30 ammo sucks. Pick one that suits your fancy.
Not really relevant to this discussion, but my personal all-time favorite is a cast bullet- 190gr. flat nosed, cast soft (bhn 10 or so), gas checked, and driven by 28 grains 3031. It is universally very accurate in every .30-30 (and .303 Savage) rifle I've subjected it to- so much so that I largely have quit experimenting along those lines- and it knocks deer for a loop.
