I shoot groups mainly to make sure my arrows are all shooting the same, looking for all arrows to be within a 4-6" circle at 15 yards. Any "fliers" are marked, to see if they shoot differently from the rest, or if it was just me.
For hunting practice, I'll put judo points on a couple and go roving. I just walk woods trails and shoot at leaves, sticks, mushrooms, or anything else that catches my eye, all at random distances from 5 to 45 yards. You learn quickly how far you can shoot and make a killing shot, and in the context of a hunting scene.