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Hello all - I recently found a 30.06 cartridge on my property in northern Minnesota with a metal detector. It's very old, has a full metal jacket and the base is stamped with STM4. I haven't been able to identify the manufacturer online. Any ideas?
 

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Most likely foreign. My best guess is French. (France)
 

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Did a Startpage search and found this: cartridgecollectors.org/headstampcodes

Good luck.
 
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