Actually, the much more crucial "bit" is a way to reliably dump all the stored power into the various coils and the like. At the power outputs required, a "simple switch" acts like a resistor in the circuit, as does all the "return" wiring to complete the circuit. Primers and centerfire cartridges are open-ended, and only need simple actions at the closed end. Adding relays to close proper dimension conductors is not going to improve "lock time" very much, either. Oh, there are scads of other electrical issues that would want fixing, too. Like how capacitors will "bleed down" id left unattended (but can retain ginormous voltages despite). Keeping them from overheating is an issue, too. Along with the lag time for them to reach charge.