I had a uncle that had a Arcade in a Amusement park in Canton
Ohio. In the late 60s the park was closed down and a subdivision
was built there. Uncle kept several of the old mechanical arcade
games, and all the Win Gallery guns, loading tubes, parts and
ammo. Being a tight old coot couldn't get a gun off him. He did
give me a couple cases of same Krumble Ball just like OPs. That
was 35 yrs ago. Have still got ammo left and it still fires, as new.
I've got bricks of ammo from 50s, still good. Ammo is only as
good as it is stored.