spelling error a corbon bullet,the shell sits in a sleeve that's inserted in another bigger sleeve then with a 1/4 inch of slide play the shell hits the primer versus the firing pin hitting the shell very simple.some rednecks here use a socket within another socket have seen it done that way with a 410.i have seen bang sticks in shotgun,223,357,44,50AE,any shell with a rim i would not go to big they get their name for a reason that explosion is close to you and even the 50AE,WILL SHOWER YOU WITH BONE FRAGMENTS ,best done when animal is under water.i have been hit with bone chunks before its not fun and in the eyes could be trouble.if interested could get pictures i guess tarawa is starting to build them soon.