What type of bullet and how old?

[kingpotatoman]

I found this on the shoreline of Maine. What type and age would be appreciated

 

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[kingpotatoman]

It’s also half the size of a penny for size, or .22 ammo

 

[DCMatt]

I'm not much of a bullet guy so I won't venture a guess.

There are several guys who frequent this forum with lots of knowledge on the subject, however they will likely need precise measurements to have any chance to ID your bullet.

 

[Tony in SC]

Half the size of a penny in diameter or length ways?

 

[HuntinDog]

Without any accurate measurements with calipers or even something in the picture to give it a size reference it's really hard to tell....
all of that said, My best guess by the picture is a spent 22 long rifle slug.