Darreld Walton, Nor have I have experienced problems with LC brass that has been fired in a machine gun. I am the fan of measuring before sizing and again after sizing. And then there is measuring the diameter of the case before firing, after firing and again after sizing. I have never been a fan of sizing a case three time between firing and full length sizing, in my opinion that would be too much work on the case.
If I am going to work that hard I will form 30/06 cases to 308 W. There is an advantage to using 30/06 cases. There are 308 W chambers that are generous. When tightening the case neck in the chamber it is not possible to make the 308 W case neck thicker, again when that happens I use 30/06 cases.
F. Guffey