I have a Remington 700 in 300 RUM, and added the Wyatts Extended Mag Box. The back of the action was machined for the extended box and I am now able to comfortable extend out those nice long bullets. Issue now is the first round in the box when fed almost always "jumps" out of the action and creates a stove pipe??? Jam, has anyone had any experience similar with this? Rifle is really coming together, stock, Trigger Tech Trigger, One piece pic rail, threaded for brake and it is shooting very accurate. It likes RETUMBO but I need this feeding fixed. (MBE-3 kit)