it would be safe to say the top choices in calibers are between 6mm and 30 cal. I personally would favor boattail bullets but have used flat base bullets too.

my meat getters are a 6mm rem , 308 win and 30-06. but looking at getting a 300 win mag. with my 308's I generally use 150 - 165 grain bullets same with the '06 I use a 85 grain sierra BTHP gameking in the 6mm but recently started playing with 58 grain v-max's for yotes and varmints.