For firearms, I only use a rest for sighting in. After that I work on 5 shooting positions (prone, kneeling, standing, sitting, and hunker). Shoot them all from both sides. I think it's easy to get spoiled by the rest. So far, I don't use a rest for the Vixen, I sighted in using the sitting position and probably do 60% of my practice from there since it's the most likely position I'll be in in the field.