My success, or lack of success, loading fiber and nitro cards showed erratic velocities which gave me concerns about my chronograph. I ruled out the chronograph as being the source of inconsistent velocities by firing factory shells which had consistent velocities. My wads are Alcan Blue Streak that are bone dry, but still compressible. I've tried recipes published by BP in their short hulls brochure. Using their nitro cards and cork wads, I still had inconsistent velocities. For the time being, I'll rely on the small gas seal and Blue Streak wads which give consistent velocities. The plastic gas seal was the solution. I spoke to a tech at BP and he advised I needed at least 30 lbs. seating pressure to compress the powder. I haven't tried that suggestion. Gil