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Discussion Starter · #1 ·
I have a Colt MK IV Series 70. I have found a few rounds that have 2 marks from the firing pin in the primer.

Any ideas about what might be causing this?

TIA
 

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I have the same gun, over 30 years old, and after throating and releaving the ejection port, I have never had a problem with any ammo. Tell us more about the load, reload, case, etc. describe the marks from the pin strike, as I am curious.
Jim
 

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Discussion Starter · #3 ·
Not much to tell. It was store bought RP, 45acp. I donot remember the weight of the slug, but nothing out of the normal.

I loaded it, pulled the trigger, it went bang, left a sad looking group. I swept the area before shooting. I recovered 100 cases out of 100 fired. so I doubt that they are someone else's cases. And only two of them have the double marks.

The markes are side-by-side and overlap each other by abou 1/4 of the diameter. They both seem to be the same depth.

I just can't figure what would do that on 2 out of 100.
 

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The gun was designed to shoot 230g fmj ammo (ball). I would get some new ball ammo and shoot it and check after each clip was fired and note any irregularities.
Jim
 
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