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Author Topic: Is there a name for this type of breechface?  (Read 1735 times)

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Offline Mike Beddow

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Re: Is there a name for this type of breechface?
« Reply #15 on: September 22, 2022, 01:30:11 PM »
If I were looking at the breechface on the firearm itself then I would call them overlapping milling marks as that is what they are and looking at the machined breechface this can be determined.  If I were to only have the fired cartridge case and were looking at the breechface impression it would depend on the quality of the impression as to how I would describe them.  In the case of describing the breechface impression only many of the suggestions could work - overlapping arches, cross hatching, overlapping circles etc.  However if the impression was good enough I would not hesitate to state in my notes that they were consistent with being produced by overlapping milling marks.


Mike

Offline Chris Monturo

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Re: Is there a name for this type of breechface?
« Reply #16 on: September 22, 2022, 01:58:10 PM »
Christi,
I would use the machining method for 2 reasons. 

1) There is no other way those marks would be produced during a manufacturing method.
2) We need to be more technical in our descriptions (when we know them) to align with other disciplines (outside of the forensic community). This aligns us with the machining community and their observations. 

Chris



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