I was wondering if someone could tell me the best set up for sighting in a rifle. I was using a vice today (with both the front and rear of the stock locked into a solid position). I zeroed it in with this set up, and then I took the front end of the vise off and replaced it with a rest which kept the barrel free but solid. With this set up I shot my groups 2" higher than when in the vise. Does having the barrel free have something to do with this? When shooting in the field, obviously the barrel is more free than it would be in a vise. Should I zero it in from this style?