[snowman]

I am shooting them in a Marlin 1895ss, a modern lever action rifle. 300g Hornady jacketed HP bullets. THe explosion happened after two rounds were completed, everything was full and progressing and then one of the primers was inserted in the case sideways. When the tray was turned to the next position, the powder dispensing one, the primer detonated. This set off a chain reaction and all of 55 large rifle primers went off, all at once. Note that I was being very careful to fully push the lever forward to fully seat the primers. All four shells with primers installed were correct, ie primer seated about 0.004" below flush. The entire primer system is history, including the steel case that protects the user. THe next post shows photos of whats left, the larger pieces.