I know a little about batteries and capacitors, and understand the energy that they can store, but I cannot visualize how that energy could by itself be converted into a propulsive force.

Now, if you placed hydrogen and oxygen tanks in the buttstock of your shotgun, and fed the gasses into a mixing chamber, then your battery and capacitor could provide the spark to ignite the gas mixture.

You would still have to insert the shot charges somehow, which could be contained in capsules in the forearm magazine tube.

The beauty of this would be that there would be no shell or case to eject, so you could theoretically improve on lock time. You would not have the bolt slamming back and forth either. Might come up with a smooth operating automatic.

This being a double gun forum, where autos are not allowed, and pumps only grudgingly, I doubt that there would be much interest here.

Happy Trails,

HHH