shooting my Knight disc extreme the other day and had trouble getting the spent primer out of the bolt. .50 cal, 110 gr.blackhorn powder, cci 209 magnum primer, 300 gr thor .502 dia bullet, 209 conversion breechplug. when i fired a primer without powder the primer fell right out as usual, but when i fired with a load the rear of the primer would swell and not drop out, had to remove the bolt and dig it out with a pick. have not noticed this with this load before, and i have shot alot of them. any thoughts?