[marktwain]

http://www.ar15.com/forums/t_6_42/362609_Hydraulic_Decapper_for_Berdan__Home_Built_.html

Check this one out. It is not a video, and has detailed still photos of the apparatus made. Should work for your 8X57.

Not certain where you would get the berdan primers for those cases, but you could recharge them.

[rickomatic]

http://www.ar15.com/forums/t_6_42/362609_Hydraulic_Decapper_for_Berdan__Home_Built_.html Check this one out. It is not a video, and has detailed still photos of the apparatus made. Should work for your 8X57. Not certain where you would get the berdan primers You can also buy berdan hydraulic hand de primers on eBay. They work pretty good, although are a bit messy. You can also buy berdan primers online. I bought some Tula berdan primers. I can't remember who had them. I'm thinking Natchez, but am not sure. The hard part is seating them. They are slightly different size than boxer primers and need a modified primer seating cup. I haven't done that part yet. I did try a Lee reloaded with spotty results. They go boom pretty easily because of the size as compared to the tool.