RE: 12ga. slug vs 30cal.
Oh sure, they can kill an animal, but I think the question is which would you pick.
I know all the deer I have shot at 100 yards, have very minimal damage with slug at 100 yards. If you hit them in the lungs, it will exit. Hit anything along the the way, I doubt it.
But a 30-06, with the correct bullet won't have nay