The 6.5×54 Mannlicher–Schönauer (6.5x54 MS, 6.5x54 MS Greek) was developed by Austria's Mannlicher in 1900 and adopted by Greece in 1903. It remained the Greek military cartridge until 1941. It is similar to many late 19th Century 6.5mm military cartridges, using a heavy-for-caliber 156-grain bullet at a mild 2460 fps. Both the 6.5x54 and its rotary magazine Mannlicher rifle became popular with hunters in the early 20th Century. The heavy 6.5mm bullets at moderate velocity were famous for penetration; it was used by early African hunters for game up to elephant, and Ernest Hemingway had a 6.5x54 Mannlicher on his 1933 "Green Hills" safari. The 6.5x54 was loaded by all U.S. ammunition manufacturers until WWII and remains readily available in Europe. -- Craig Boddington