The Lead Sled, particularly when a lot of weight is used and with heavy kickers, has been known to destroy scopes. No movement of the rifle equals all the force being absorbed by the scope. In other words, when a rifle recoils against your shoulder, you act as a shock absorber. Less shock absorber equals more stress on the rifle and everything on it.
You can take the second scope off and test it on another rifle to be sure, but give it a good test with several rounds and by dialing the square. Even if it's broken, a few rounds may go in the right place.
If it's not your scope, ammo, or barrel clogged with copper, check the gun and stock itself very well. Look at the bolt face. Look at the locking lugs. Look around inside the chamber. Check the action screws and make sure your stock isn't cracked at the screws or the tang.
