Agree w/ Chas, check the action screws, scope mount and ring screws. But really, if your close to aiming point at 25 yds; you can move out to 100 yds now. I've personally noticed some TERRIBLE parallax at close distances with alot of scopes. Kinda hard to shoot a good group with bad parallax issues. Hopefully the brand new scope isn't the issue, but occasionally scopes are bad, even the high dollar ones. If you cant shoot a decent group at 100 yds, and you have a spare scope; try the other scope just to see if the new scope is the issue...............hopefully you find the fix to be simple. Good Luck.