Primer symptom - MP-Pistol Forum

Primer symptom

This is a discussion on Primer symptom within the MP Reloading forums, part of the Smith & Wesson MP Forum category; primer sypmtom.jpg The attached pic shows a fired round that appears to show the firing pin impression in the primer dragging to the left side ...


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Old September 27th, 2016, 10:00 PM   #1
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Primer symptom

primer sypmtom.jpg

The attached pic shows a fired round that appears to show the firing pin impression in the primer dragging to the left side as the brass is ejected and some primer cup material being displaced out of the indentation...at least that's my interpretation. Please comment on what might be causing this. The ammo was near max to max loads so over-pressure could be involved but it's the drag mark that has me concerned. I didn't have any other ammo with reduced loads to compare. I didn't notice the symptom until they were inspected later.
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Old September 28th, 2016, 08:53 AM   #2
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That's caused by the way the breech face is made on the M&P, its perfectly normal, nothing to worry about. See attached photo.

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File Type: jpg breachface.jpg (49.8 KB, 18 views)
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