There was an attempt to restart the electric firing of shells back in the late 70's or early 80's. It failed for a number of reasons I was told. One was concern about possible shell instability with something as simple as static electricity I was told. Another was the firing was so fast, like milli second lock time that there was a problem with recoil being perceived as greater than conventional fired shells. Perhaps it was just an improvement that was not seen as an improvement and few are interested with new when tried and true are cheap and easily sold. After all unless you are looking at a government contract your research has to yield early profits or is quickly abandoned.