heeled bullet
design of bullet where the internal diameter of the barrel is often, but not always, the same diameter as the cartridge case
en-US/ˈhild ˈbʊlɪt/
en-GB/ˈhiːld ˈbʊlɪt/
design of bullet where the internal diameter of the barrel is often, but not always, the same diameter as the cartridge case