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I know its an old thread. Today, I brought out a box of once fired, full length sized, then loaded with 168 Sierra match kings. .308 Winchester, Federal Gold Medal match brass. The ammo has been stored 7 or 8 years in an ammo can with several boxes loaded on Winchester brass. The Win brass loads are all fine. In the box of Federals, 17 out of 20 case necks are split. What is even more odd is that 4 of the cracks go all the way back to the back of the shoulder and start running around the case.
What in the world caused this?
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