AAC 9mm brass

Tonyqt

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Can anyone give an opinion on this brass? I came home from a range trip with more brass than I shot. I only shoot my reloads and have never seen or used AAC stamped brass. I don’t know if this was once fired or someone else reloaded them and I was able to pick them up. These 3 are pretty badly cracked as seen in the picture. I checked the others I picked up and had about 35 more that were not cracked and fine. In all the years I’ve been reloading I’ve never come across this many of the same headstamp cracked in one group. Has anyone else see this problem before?
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I also haven’t seen that, those are some pretty bad cracks. BUT I wouldn’t make any conclusions about AAC brass without knowing more about the load (factory or reload) and gun they were shot in.
 
AAC is Palmetto State Armory's own brand of ammo. They load it on Dillion 1050's with motorized actuators at the Dunbar Rd plant in W. Columbia SC. Since it's stamped with their own personal logo I'm assuming it was new brass when they loaded it. Who or what happened to it before you picked it up at the range is anyone's guess.
 
I'm thinking bad batch of brass, as in brittle. Even if you accidentally fire a 9 in a 40 it looks like this...

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Off-topic a bit. I saw a bunch of this on the ground at the range yesterday. WTF? Did someone get 45ACP to fire in a 45GAP chamber?
I'm guessing it was something like a full-auto Thompson that doesn't have a firing pin, just a nub on the breech face. Possibly a dirty chamber, or a piece of brass stuck in the chamber preventing the round from going fully into battery. The case stops moving, the firing pin nub hits the primer and fires it anyway.
 
I’m if it is uniform around the case I would say weak recoils spring or worn barrel link allowing the pistol to unlock prematurely
 
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