I have used water to hydraulically pop out Berdan primers. I tried to drill out some, but you can easily damage the anvil, then the new primers might not fire!! I had some excellent Swedish 6.5X55 ammo with Berdan primers, and decided the brass was too good to scrap. RCBS does sell a Berdan primer remover now, and decapping should be a lot easier than it once was. If you love to spend time in the loading room, which I do, then using Berdan primers isd no big deal!!