Was it once fired commercial 30-06 brass or military brass ?
Make sure you have the de capping rod recessed into the die before using it.
Also get some Hornady one shot case lube and spray your cases liberally.
Under lubing is a major cause of stress and failure during the reloading process.
Hand priming is ok for small pistol, but for large rifle and magnum loads, you need to seat the primer with authority and a mounted press system is best suited for that.
Good luck and shoot safe.
SJC