Question on Magtech Brass 12 gauge Berdan primers in SASS Wire Posted 1 hour ago 55 minutes ago, Lead Monger said: Berdan primers are larger in diameter than Boxer primers. Thanks. As I understand it, depriming is the issue with Berdan primers because of the blockage created by the barred primer pocket. Can the pocket be modified to allow normal depriming die to be used? The primers ARE available.