the mother of the 6x70R is the good old german 6,5x70R called Bleistiftpatrone means pencilcartridge because you can good writing on paper wth a softpoint. this was an old one for making small drillings. when they need a new one for insert barrels in 20 bore shotgun barrels the stupids make it from the old. they have to stay with the oldtimer but allways believe they sell more guns with a new cartridge.