What kind of accuracy would be expected from a model 12 in 223 rem. With a durramax stock. Printing about .750 inch with 52 grain hornady match bthp seated to 2.312 and 25 gr. of imr 4895. Shoots 1.5 plus with factory ammo. Shot off bench with bags at 100 yards. Scope is a bushnell banner 6x18. Suspect scope is the problem but wanted to know what kind of accuracy to expect before changing scope.