This cartridge was produced by Remington. Not sure of the dates, but must have stopped making them in the late 60's.
Loads were; 86 grn lead, mv-1460ft/sec,me-405ft/lbs.. 86grn soft point,mv-1525ft/sec,me-405 ft/lbs.. 60 grn hollow point,mv-2250ft/sec, me-675 ft/sec.. These figures are using a 24in. barrel. Sorry , this is the only info i could find.