My father was given a plastic box of 6mm BB Cap's their made by Flobert-Patronen made in Germany i have a picture but i now see that i can't post it the're case is almost the same length as a beer bottle cap is tall and there accurate out of a 22. Does annyone know what these are for,their purpose or annything abought them neither of us has seen them before or seen them for sale or know annything of them their real quiet and there's less powder in them than in a short annyone seen these?