>>nitwit+m1
There are plenty of guns running around that are over 100 years old that are surely an antique by anyone's definition, but are safe and reasonable to show with modern ammo. Pretty much any gun of that age, unless it was some kind of commemorative thing from the start, is going to have plenty of rounds through it already.
For example - an M1903 is an antique by any definition, and you'd be hard pressed to buy one today that's unfired.