The K+S full length insert barrel on my Krieghoff combination gun, 12 ga./7X75SE vom Hofe, is in caliber 6X52R Bretschneider, which propels a 95 grain bullet at 2950 fps. I'm still waiting for a chance to try it out on a whitetail.

The cartridge is either a 5.6X52R (.22 Savage High Power) necked up or a 6.5X52R (.25-35) necked down. Either way, it's a one stroke of the loading press operation.