I have a 280 Ackley with a 26" kreiger barrel that I have just started the break-in process. I am shooting a reduced load , mainly to get rid of some bullets that I do not intend on using. I decided to check some of the fired cases for stretch just out of curiosity and to my surprise they were shorter than the unfired Nosler brass. by .oo4 , anyone else ever encountered this? is this common? I thought cases always stretch when fired.