Take the scope off the rifle and take the mount off as well. Make sure that all the mating surfaces are clean. Remount everything making sure that you have solid metal to metal contact. You can add a few drops of Loctite under the base if you want. When you remount the rings make sure you get full and solid contact between the base and the bottom of the rings. Same when you put the scope in the rings.

If you have another scope that you know is good, give it a try once you've confirmed that the base and rings are good to go. If that fixes the problem, send your 4200 to Bushnell to get fixed. If that doesn't solve the problem try a different base and/or different rings (or swap the rings front to back) or lap the rings. If it demonstrates the same problem with different scope, rings and base, the rifle needs to go back to Savage because the receiver is bored crooked.