The Mk.7 bullet was a flat-based 174gn compound type, with, at various times, a GM, GMCS or CN envelope. Nominal mv was 2440 fps, propellant could have been cordite or NC. There is no identical commercial equivalent currently made. Most commercial producers use a BT bullet, which may not set up properly in worn bores. FNM of Portugal make a FB bullet, though it weighs about 185gns.