With fiber wads I was able to obtain consistent velocities due to seating the wads with at least 60 lbs. pressure. I concluded that it wasn't powder compaction, but the downward pressure on the wad causing it to bulge against the walls of the hull effecting a more consistent seal against the gases bypassing the wad. I also used honey bee wax to coat one of two nitro cards used in my recipe for 2" 12 ga. loads. While the the velocities were consistent for my purposes they weren't as consistent as plastic wads. The old rule of thumb regarding switching from plastic to fiber was that 10-15% more powder was needed to offset the relative inefficiency of fiber compared with plastic. Gil
