Hey guys, I hope you’re all doing great. So basically, I just made the harlot and I used .22 LR blanks. After I fired, the cartridge case cracked on the side and there are now tiny residues in the barrel. I just glued the air rifle slugs on the front off the blank. Can anyone tell me what these are? I used .304 stainless steel, 8mm OD, 6mm ID.

https://imgur.com/a/pFlayjb

Cheers (: