My approach is a merger of all the comments made so far:
I believe that, for the most part, traditional hunting is about 1 well placed shot - made under whatever conditions exist at the time & place. While I do practice shooting groups that is shooting practice - my hunting practice (in prep for a 2010 elk hunt) is done while wearing hunting clothes/boots including a fully loaded pack while running a circuit through 4 (or so) different targets. The ground is rough - including ditches, grades, heavy brush, etc. I run (at different paces) from target to target, stop at an unknown distance from each target and shoot a single arrow. The shot is made in different positions (kneeling, bending over, leaning around a bush/tree, standing in a ditch, etc while shooting.
I won't pretend I shoot as well as I would like - but - I will say that my hunting shooting is much better than it was before I started using this approach. I can also say that my pack is much more effectively loaded now.