I have a Savage 10fcp in 308. It has been glass bedded 1.5" infront of the Receiver to free float the barrel. I would like to order a Pacnor prefit barrel for this rifle in 6.5x47Lapua. Does the prefit barrel need to be the exact contour as the current barrel? Can I change the contour and still get a good fit in the stock, and current bedding or am I limited to this Barrel and contour?