A couple of 50 BMG projectiles, help ID

What is this one? Steel body with a brass bearing band?

This one I presume is one of the experimental Anthena rounds


Scrap that came from Lake City I had (have) quite a few pieces but when I came to SLICS from a de-miller Bill Woodin ended up with any and all he didn’t have (one would be honored to give Bill anything he didn’t have. I still had three of the aft ends (@ SLICS 21) of the “assumed” explosive projo as the front steel tip slides down into the aft end with assumed room for stuff to go bang

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The Anthena looks like the standard type.