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Much depends on the exact wording of the report.
Take another look at the firearms examiner's report. If the conclusion is made solely on the basis of comparison of two (or more) fired cartridge cases, the examiner likely looked at three items: The breechface markings on the base and primer, the firing pin impressions on the primers, and the extractor marks on the "rims" of the cases. It may be difficult to reach a conclusion based on only one of these factors, but easier using two or three.
Johnny
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