Oh yes they will , we've had disscutions about this very thing . With a normal cracker gun the charge is about 7 grains .
What I really like about this design is that it is scalable , you could keep the rotating bolt realitivly small and use it as the booster charge for a bag gun .
The projo goes in and up the tube a 'bagged charge' (nitrited paper)goes in behind it the cap and small charge in the bolt will fire the bag .....
Gary
when the Krupp is loaded it will be no toy ! ....... it is .312" dia and could kill with a ball .