try two things here;, if you are testing off the bench, make sure the front swivel, which is also the takedown screw, is totally loose, almost ready to twist out of its' threads. shoot several groups with diff rounds like this, and let cool at least 30 seconds between shots.
After you do that, put a little hard rubber pressure pad up front, or for the time being, fold up a little piece of paper, and put up front, under thebbl, just at the tip of the stock. leave the screw loose still. try several more diff ammo with 3 shot groups, still wait between 30 seconds, for shots.
then try that same pressure pad, but start to tighten the screw on the front swivel. once you feel tension, try some groups with it right there, then tightent 1/2 turn, try some more groups there, then another 1/2 turn, try some more groups.
Allways wait at least 30 seconds between shots. this will take some time, 2 or 3 hours, and lots of ammo. but you will find a sweet spot. mine was with not tension on the takedown swivel, pressure pad up front.