@Mag Wheel Man- This is what I was getting at. I dont have any shot berden primed stuff around to look at right now. I have the machine shop and I was thinking that the berden primer could be removed by drilling a center hole like a boxer has. The berden primer could be pushed out then the pocket could be bored to accept a modern primer. I am certain Im not the first to think of it. I was contemplating why its not done regularly? Primer dimensions are to far apart? Not enough brass to bore out? Etc....
Concentrated power is not rendered harmless by the good intentions of those who create it.