Bullet - .45 ACP?

[jliller]

Surface find on a riverfront area that had World War II activity. Appears to be a fired .45 ACP bullet, although my calipers give a diameter of about .43 (it's not quite round, presumably from being fired).

Any significance of the double neck grooves? Does that narrow down the year or manufacturer?

 

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[RobRieman]

Double grooves are sometimes used on military ammo so the crimp of the casing holds tight during rough handling keeping the bullet in place.

 

[against the wind]

Cool find