Federal brass? I have Federal brass, before FC was Federal it was TW, Federal ran the Twin City Arsenal during WW11, before Federal ran the Twin city Arsenal they only manufactured shot gun ammo.
jagged edge? I have fired different cases by different manufacturer in receivers when testing questionable receivers, as in being warned the receivers were suspect. As always it was not the receiver that failed, it was the case. When testing the receiver and choosing the case I measure the length of the chamber, then choose a case, again, I am not testing cases, I am testing receivers. When it comes to reducing case travel I form cases to fit the chamber. Even then at the ragged edge, case head separation can occur, again, when the rifle fails it starts with the case.
Then there was Ackely, and the Japanese receivers, “Strongest receiver in the world!!”, and, I am quoted saying “Forget the receiver, I want the cases, the cases did not fail? so I want the cases, the strongest cases in the world”.
I have Japanese receivers, I have 5, not fair, all of my Japanese receivers have a cut down the right side, in all appearance they all look like they are cut more than half way through the receiver for the length of the receiver, the cut was necessary for the extractor. Again, case failure happens before receiver failure and I have wondered about that big cut down the receiver on the right side, and thought? if the case failed, that big hole could be used for gas escape, then there are the smoke holes in the top of the receiver, when testing the Japanese receiver I cover the top of the receiver with a white towel, when there is not enough pressure to seal the chamber with the case the smoke holes will cause black dots on the white towel.
I have Norma 6.5mm50 brass, my favorite brass for the strongest receiver in the world is 30.06 brass formed to 6.5 Japanese/257 Roberts. If the FC case is soft, it has to be easier to form, When forming I prefer new brass, when a case has more resistance to sizing than my press has ability to overcome come it does not take me long to figure I am working with brass that has been fired many times or loaded once with a very stout load.
F. Guffey