I'd not worry too much about it. Even if a deer runs 50 yards, at most, 99% of the time whether from a solid lung/heart hit you'll be in great shape with any of your current rifles. If you can take out bone, so much the better, but I'll take a rifle over a slug anyday of the week as far as shorter blood trails and closer to instant deaths. Like a few have mentioned, I haven't seen anything wallop deer dead with lung hits everytime, but quick expanding bullets tend to make the trails shorter.
