I have one box (25 shells) of this stuff. The outside of the box (it was packaged in a 10 gauge Winchester steel shot box!) has a label that says CAW OOO BUCK LOAD FOR DEMONSTRATIONS IN 18" or 27" bbls. 35.4 gr. WC440S This was ammo made for the HK CAW.. and the cartridges are entirely made out of brass, it's a belted 12 gauge proprietary shell. The top wad is clear plastic that you can plainly see the buffered 000 Buck through it. I'll add a pic as soon as the camera makes it back home!