Stuck primers with disc extreme

I had the same problems with my DISC extreme bolt/bare breech plug shooting the Federal 209A primers. Always got stuck. I switched back to W209's, used sabotloaders advice and put a shim in the breech plug. Get great ignition, the spent primers falls out when the rifle is tipped sideways and the primer itself is CLEAN, no black residue, showing me that the flame is all directed down into the flash channel. Also shows that the primer is fully seated against the base of the breech plug, allowing that flame to do it's job.