I have a .270 medalion with Boss. I only had a few minutes so I took it to the pit to see if it was still on. I shot three times at 50 yard and 3 at 100. I was at least a foot high at 100. When I got home I noticed the Boss on the end was loose and the setting was off. Would a loose boss change my ballistics that much? Any one have any experience with BOSS?