Check out the Hill People gear Kit Bag as a hunting holster.  After trying pretty much everything ie. Safepacker, OWB, thigh rig, etc, I have determined they are the only way to go.  Thigh rig moves too much.  OWB means no backpack with a belt, safepacker was ok but quickly drawing is impossible. 
http://www.hillpeoplegear.com/Products/tabid/762/CategoryID/1/Default.aspx