Variation in the amount of liquid loaded, from 20 to 100 ml, had little effect on the performance. Changing the inductor to a 100 mH unit, or using no inductor, had no discernible affect.
After the shots described above, the gun was disassembled and inspected. The tungsten center electrode and the inside of the stainless steel breech were both severely eroded. The polycarbonate breech closure and the alumina barrel were unaffected.
Given the poor performance and lack of durability of this design, I have no further plans for it.