I don't know why but I believe brass hardens with age .I recently fired some 243 Winchester rounds that were loaded in 1978/79 . I used new Winchester cases , IMR 4895 powder and Sierra 85 grain HPBT bullets when I loaded them about a third of them split the necks when I fired them. A few split in the shoulder area. I used the same bolt action rifle that I've used all this years and haven't had any problems with newer ammo either before or after I fired this old ammo.


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