Oh, sure, it's a cliche scene in movies. Gunfight breaks out, a character checks the fresh date on his bullets and chucks them over his shoulder. "Damn. No good any more."

If your question was serious, I think it would be a few millennia before bullets go out of date.

>Serious question (idle curiosity) for the gun types.
>
>Does ammunition have a sell by/ use by date ?
>
>Never seems to crop up in movies/tv so is it good forever.