Mike, I found this discussion on the Cast Boolits discussion board just this morning. http://castboolits.gunloads.com/showthread.php?75108-9-3x72R&s=1c8d7bfae4fd492f551a47597ee3e683. It appears that some Austrian gun makers made their guns 9.3x72R with a 2-taper chamber so that they could sell proprietary dies and ammo. Based on this and the fact my full length resized rounds won't fully chamber I suspect my gun may be one of these. Regards, Doug K