Hey guys, I'm shooting a T/c Bone collector with Barnes t ez 250 grain and harvester crush rib sabots(black), 100 grain of Pyrodex pellets and a Leupold ultimate slam scope.I'm having a hell of a time getting this thing sighted in. At 50 yards I'm dead center (3 shots) at 100 yards I'm all over the place high, low, left, right, everywhere! And I'm not talking by 2 or 3 inches I'm talking 6 or more! I'm using a lead sled so I know it's not me. Any suggestions what is going on? Scope and mounts are tight.