Sig P239 vs. CZ P01

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TMann said:
Pardon my ignorance, but in what way does aluminum ammo behave differently than brass? I ask this question, because my 75b has been having FTEs with some aluminum cased Blazer 9mm.
So did my PCR compact. I can only speculate, but it may be the lighter weight of the case, clinging excessively to the chamber walls at the moment of firing, or the extractor groove shape.
 
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