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I just looked at your photo and then took a second look at my case. Something interesting I noticed. In your photo the area you call "the belt" and measured at .4 compared to a "normal" of .385 (I assume that's roughly at the top of the web) on my blown case it's all the way out to .42 +/- . My guess is that this area is analogous to unsupported area between the chamber face and bolt face rim/wall.
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"Everyone speaks gun."--Robert O'Neill
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!
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