Not a good thing. Previous cracking along pattern, moisture build-up, excessive powder charge, etc. It would be nice to know what he loaded or was trying to load.

As for being a double drop of powder, not in a progressive machine, brother Drew stated Mec 900, I believe he meant Mec 9000 which is usually set up for automatic operation except for new shell placement and wad placement. Every time it indexes, it moves to another station and the charge bar does the same. The bushing will hold just one charge of powder, and one charge of shot. So I do not believe a double charge from a Mec 9000 or any other progressive Mec.

The wall thickness looks good, the recipe is what is needed.

David