Some type of bullet?

[J.Cohoon04]

Found this in the same field as the mystery "E" button. It mic'd out at .450 across the base, but looks odd to be a bullet. Any help is greatly appreciated!!

 

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[Beeps in my sleep]

That could be a wad cutter from a muzzle loader

 

[J.Cohoon04]

That could be a wad cutter from a muzzle loader

It's almost completely cylindrical, and the "tip" where its mushroomed a little has a little hollow in it.