I was very disappointed tonight when I discovered this while re-arranging my collection. This is one of the first nice old shells that I ever got, a Winchester Leader loaded with Infalliable powder. You can’t tell that now! The shell was stored flat, inside a tool drawer. It’s the only shell I have found this way.
It appears that some kind of insect has chewed up the top wad and used it to make what I assume is an egg case, which is now glued to the wad.
Here’s your chance Ron to indulge in your ‘other’ expertise! How would you prevent this from happening again?