I am entertaining the thought of purchasing a new Savage dual port 6 mm Norma BR rifle and was wondering if I am going to be able to use the Lapua brass in this chamber. I heard somewhere that it might have to be run through a small base full length die first, if this is the case would that be a one time thing or would that have to be done after the initial time, also I am planning on shooting bullets in the 70 to 90 grain range and was wondering if this chamber with will be right with these bullets. The barrel is a 1 in 12 twist.