i understand that. but that does not help with smoothing out some bugs in the bolt throw and working in some magazines. the bolt is silk with nothing in it. but feeding rounds does odd things from time to time. ever so often ill get a round that the back of the case want to jump up above the bolt face and bind in the shoulder in the chamber. relese the forward presser on the bolt handle and it drops down and goes right in. ive only ever had this issue with the 6.5cm. so that is part of my reason for dummy rounds.