Anyone have any experience with this scope? I was wondering what load it is calibrated for in the BDC. I've tried Hornady SST and Remington coppor solid sabots and can't get them to hit the point of aim using the 100 yard bracket. Both group fine at 50 yards. Shotgun being used is Rem. 11-87 premier with fully rifled cantaliever barrel. Any help is appreciated.