Been shooting a model 70 Winchester ultralight, and the gun has been very accurate using Remington accutip ammo. Going to any other ammo and the gun will not hold any type of group. This evening I took the scope and pulled the bases off. Come to find out the bases are not the same height the rear base is higher than the front base. Would this case my point of impact to be off? The base screws and scope ring all felt snug when I took everything off?