The shoulder is long and sloping on the Hornet. The K-Hornet is like an Ackley Improved cartridge with an abrupt shoulder. The brass can't flow forward much at all. Kilbourn actually came up with the K before Ackley make his.
I had a hornet and still have a K-Hornet. More speed, better accuracy, longer brass life with the K.
The brass for the Hornet is very thin, more like a 32-20 than a cartridge like the Enfield.