you can deprime berdan primers by hydrolic decapping,a close fitting rod(A piston) fill the shell part way full set the shell on a couple of washers,insert the rod struck with hammer,or you can make a chisel out of ice pick,invert the seating die in the press and drop the case with the primer exposed,you can force the chisel point of the dent of the primer and pry it out,being carefull not to gouge the anvil or the pocket wall,you can buy berdan primers from old western scrounger,type in on the search in old western scrouger,when find ows type in berdan primers on the search site,the primers cost about .05 each in lots of 250.it is best to stay with berdan primers if you are going reload them as they are larger the most .210 boxer