Esteemed Board
Bill Skora, a gunsmith friend, is making hydraulic berdan deprimers. He just made me one for my 7.62 Nagant revolver.
He can be contacted through Bill Garner, e-mail billg@The-Armory.com
If your case is an unusual one he will probably want a couple of them to ensure that it fits and works.
Oh, my cost was $35.00.