Unknown bullet type posted on Facebook collector's page, .223/5.56mm?

Photo posted by Josh Michael: https://www.facebook.com/photo?fbid=3545837012143533&set=gm.1534629553410685.
Only the photo was available with no additonal information.

Unknown

Any information on these bullets? Short range training?

Thanks,

Brian

Self made?

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I’m guessing a machinist’s “gun show” loads since they’ve never crossed the collecting community’s awareness. Easily could be wrong. And if so, I want three. One full up. One for the projo. One for Paul to section 🤨

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Assuming real, could these be, super caveating?