Originally this was a wildcat cartridge made by necking down the .250-3000 savage to .22 caliber. It is not known exactly when or by whom it was made first, but most sources credits the US gunmaker J.E. Gebby as being first, calling his design .22 Varminter. This was in 1937, but since the parent case has been around since 1915 it is quite possible that some anonymous wildcatters were way ahead of the well-known gunmakers. In 1965 Remington decided to put out a commercial version of this very well-balanced high-velocity small game cartridge that is effective on varmints up to 400 yards due to its flat trajectory.