It have been around already for awhile. Have thought about the .308 Winch, it must be the real short 300 magnum cartridge. Came in the 50´s, burns little powder but gives energy like that long 100 year´s old cartridge. Can be loaded with many different powders and with bullet weights from 100 to 220 grains. Good ballistics, very accurate. Not bad or what you say?