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I am trying to figure out if shell casings of different brands could have different breechface impressions. If an expert says that the breechface and firing pin impressions on the shell casings are a match, how can he tell that for sure if the gun wasn't recovered when the shell casings are different brands and some are FMJ and some are not?
Thank you! And again, I am willing to retain an expert in this matter as well. I am looking for someone with experience in firearm examining as well as gunshot residue who has worked with both prosecution and defense.
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