I got the same results, with my open gun, Kevin. I will use a bench rest to determine a particular loads group size but, other than that forgetaboutit.
Same for me, it's different, don't really care why, so I zero freestyle, no bench..................
Also sometimes naked, but that too much info.
TMI !!!!
POI I can change. But if I cannot get consistent results from the bench how can I tell if gun/ammo are performing well? Maybe if my off hand hits are ok then it does not matter?