Recieved a Mossberg 4x4 300 win mag and a Leupold VXII 3-9x50 for Christmas. The problem is, I am having a booger of a time mounting this scope. First off tried using med. hight Leupold rings on the stock mounts...too short in hieght and bases were too far apart. Then used chart supplied by Cheaper than dirt and bought 1" Dual Dovetail Rings, high and Dual Dovetail 2-Piece Base Matte Finish - Remington 40X, 700 (LA & SA); 721/725 (RH & LH, LA & SA); Weatherby Vanguard 700 (RH, LA) part #50044...supposed to work by their calculations. Paid as much in shipping as I did for the rings to get them here in time for a hunt. I mounted the bases, locked on the rings and low and behold... the bases were set about 1/2" too short, the rings are hitting the bell. Scope nearly reached 350 fps across shop, or would have if wifey wouldnt have been standing there. . If anyone cane please advise me in the right direction, it would be greatly appreciated......I am at a loss, neither Cheaper than dirt nor Leupold will reply to my e-mails.