T O'Heir, what problem did you have? Let us know and we can probably help you out.
Berdans take a little longer to decap, but not much. I don't have any special equipment. The GP11 ammo is good to shoot, and great brass also, a shame to waste it. If you want my method let me know, its pretty simple.
I use the Lee Auto prime to prime them, everything else is the same. I have been loading with Varget and Remington 165 PSP bullets, it shoots real well.