I'm looking for a 7mm-08rem take off barrel from a model Seven. I'm looking for a 20" not the 18 1/2". I would prefer one with fewer than 500 rounds through it. I know that a 700 barrel will fit on the model seven action, but I'm concerned about the contour. I don't want to let out the barrel channel on the stock. So, model seven take off barrels only.