Been awhile since I shot it,but IIRC with a 300 gr SAF it is around 1-1/4" at 100 yards. Good enough for jackrabbits.
Nice, and I'll bet those lightweight Weavers have never thought about slipping that scope.
It isn't an issue in this case. Ken's so damned skinny he absorbs all of the recoil, much like a pole vaulter's pole bending. That way, there is no real recoil impulse to bother the scope mounts.
Ed