I am have some difficulty getting my Medalion dialed in. I have switched ammunition to a 180 Accubond by Winchester from 150 grain Remington CoreLOKT. I have the BOSS. I have never had this much difficulty sighting in a firearm. I am shooting about 2 inch group at 60 yards slightly to the right. When I move back to about 125 yards I am shooting a six inch group low and to the left. I am using a Nikon Buckmaster scope 4.5-14X40 adjustable scope. Any advice would be greatly appreciated.