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I found these at the range today. The shoulder is some sort of plastic material, and the web/head is like some type of insert that can slide up and down. I can't physically slide them down, but they will move. I did find one that was slid all the way into the case. If it helps any they're made out of aluminum. I haven't stuck my dial calipers to them yet but visually they seem like they are 223/5.56.
 

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Military blanks. I found some like that once, but in .308 at an old army range in QLD.
 
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What insert Trav? More pics?
 

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Disregard my last transmissions, never seen anything like that.
 

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They kinda remind me of some reduced recoil loads a guy had his wife shooting in an old Argentine Mauser. They were all blue and had a plastic coating covering the whole cartridge except for the bullet. The end did not press inward though.
 

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Sub-caliber inserts, maybe? They used to make those so you could load a .32ACP into a 30-30, and shoot it out of your rifle as a small game load, that kind of thing. Miking the case mouth might tell you more. But I do think they're made to fit a .223/5.56 chamber.

What about tranquilizer darts?

The lack of a headstamp or other markings is confounding.
 

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I have no idea what they are but my wife was sitting next to me while I was viewing your pics and she said you need a manicure. :hmmmm:

FWIW. :biggrin:

Jack
 

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Dunno:hmmmm: I reckon they're pretty good for welder's hands.
 
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