The british called their break-action revolvers(enfields and webleys) from 30's to wwii ..380 or sometimes .38-200(for the bullet weight). This is same casing as usa .38 S&W(not special) and doesn't use a heeled bullet. If you have a black-powder era revolver you need to research or cast the chamber. Cartridges of world shows .380 revolver(1870's, a .375 heeled bullet), similar to and may accept .38 short colt. good luck