I was thinking some neck reaming would have to be done, but after seating the bullet the diameter of the neck and the base were not that far off. I will ream the chamber +.001 over the neck diameter and fire form the cases most likely and set the headspacing off the case mouth. I will let you know how it goes. I have the 23 inch barrel so if I screw up I have some room to cut and re ream. First I will thread the barrel and then go for the reaming and see how it goes. Stand by for updates soon.