have you tried removing your bolt. thenput your gun in a gun vise or on sand bags where it will not move. look threw your barrel andaline the borepicture on an object out about100 yards.then go to your scope and see if you can aline your cross hairs to meet on the same object. if you can aline the two and it still hits 10 inch low at 25 yards it is usually the scope. if you can not aline the two then you must shim.but i have also seen where the mounting screws in the stock were not tighten evenly and this can make the gun shoot weird. good luck just my two cents