Any Idea What Caused This?

Maybe take some time reading the Hatcher's Notebook.... the Chapter VIII covers "The Strenght Of Military Rifles" which end with "Some Reasons for Cartridge Failure"....

His illustration of the defective military case is very similar to the two 44 cases in question, isn't it?
Thanks for mentioning Hatcher's Notebook, a person forgets just how much true information is stashed away in it.
 
This case was shot with the same load out of the same type of firearm, what would be the problem here?

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I'm suspecting faulty brass here. In this case, it looks suspiciously like the punches for the brass (at the factory) were set too close together, and one punch nicked the other, causing the brass to be thinner along the point where it was nicked when the brass is drawn from the first punched cup to full-length. Hatcher's Notebook (as already mentioned) has some excellent photos and material on exactly how this can happen, and the end result.
 
His illustration of the defective military case is very similar to the two 44 cases in question, isn't it?
Thanks for mentioning Hatcher's Notebook, a person forgets just how much true information is stashed away in it.

Well, you know, Internet have made a lot of theories, sometimes with elaborated - and often "strange" - answers by "experts", while, in fact, most of these questions were already dissected years ago and forgotten in hard things of the past, called books... you remember, those things made out of trees!? ;)
 
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