Ditto on the crimped in primers, but also of the primers with lacquer or "superglue" will not come out with the hydraulic punch.
You can set the case on a proper size shell holder. I just can't get the hydraulic to work.
Try this, remove the primer punch from the sizing die. screw the die in yout press upside down. place the berdan case in it. the go to wood drill bits, the flat sided ones used to bore a half inch, 3/4" or 1" hole. The ones that have a sharp centering "punch" place the punch in the dimple from the firing pin on an angle and give it a wack. works great. I picked the upside cown die off a you tube video than pulled a wood bit out of my drawer, and bingo, primer out. with no damage to case. then either use an RCBS swager die to get ride of the tiny crimps.