Yeah this is important. MAKE SURE THE BULLET LEAVES THE BARREL THE FIRST ROUND, IF NOT CHECK THE BARREL. I had a vintage .22lr that was given to me and upon inspection you could feel a bulge on the outside about 2" from the muzzle where someone either tried to shoot it out or was rapid firing and didn't realize one didn't quite make it out, it grenaded inside the barrel enough to remove a ring inside the steel barrel. I still shot it with the ring in it and it still shot surprisingly well for conditions, but I removed that section anyway.DO NOT attempt to "shoot it out".
It's a bad idea. Trust me.
If I'm not mistaken, "golden bullets" where plated. Maybe early 60's(?).