Between plastic wads, and fiber wads, which would produce more pressure? I ask because I recently started reloading, and the only way to make it worth my while for standard weight/load shells is to make my own wads. My wads are stacked 3/4" paper discs cut from empty cartridge boxes. I put 5 on top of the powder, a measure of fine sawdust as a filler, then 3 on top of the sawdust, followed by the shot. Does the amount of pressure I apply to the powder change the pressure too?