There is a guy that is making primers over at Cast Bollits with 2 toy caps used as the priming compound. He has shown single digit ES as compared to the same load with factory primers. However he says that there is a a 3/10s second longer lock time and has shown it with acoustic devices. I am sure there will be problems if trying to do this but it isn't rocket science. I am sure the gunsmiths at Kyber Pass do it all the time. Third worsd companies do it every day.