These days I found this pinfire cartridge cal. .450 (12 mm). It is my first of that kind. Obviously, the customer (perhaps, not manufacturer) was The Ottoman Empire. I wish to ask is that round rare? What was the approximate time period of manufacture? I’ll be very gratefull, if someone posts some ballistic data about that particular caliber, because I’m absolutely unaware on pinfires (approximate weight of the bullet, muzzle velocity, etc.).