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Question about Brass

I run a 125gr. LRN on top of 4gr. of Trail Boss out of the W-W - A middle of the road plinking load.
The one on the left failed in the cylinder. The one on the right I caught while I was belling the case mouth.

I usually just crimp very, very, very slightly into the cannelure (see left bullet).

I do not see a failure so soon with other nickel brass such as RAI, R/P or Hornady all things being equal.
 
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