Use Iron Jim Rackham's system involving only OS cards. He uses 4 in place of an OP wad, then his shot load, and then 2 OS cards on top of the shot. Each of the cards has a hole poked off center, and the cards are aligned so that none of the holes line up with a neighboring card's hole. I use 70 rains FFg for the charge, and 1 oz. of shot, which happens to be about 70 grains by volume setting on the same powder measure, more or less. Lube the barrel after seating the OS cards down on the shot. so fouling stays soft.
The advantage is that you only carry the one type of wad, rather than 3 different kinds. I don't have to lube up a wad to go between the powder and shot. The OS card is slick, so that it pushes against the back of the shot column evenly. That helps inprove patterns. The lube in the barrel helps the lead pellets slide down the barrel without leaving lead streaks in the bore, which ruins future patterns. The holes in the OS cards allows air to get between the cards, which makes them slow down as if they had air brakes, and fall away from the shot very quickly after leaving the barrel. Using other wads, the wads ride a vaccuum behind the column of shot for at least 10 feet before air begins to separate the shot and break apart the vaccuum. And, with that vaccuum, the lighter wadding is actually pulled into the shot column in mid air, in what auto racers described as " Drafting ". Physicists might suggest that the shot column is temporarily a heavier mass, and its gravity pulls the lighter wads toward the column of shot, through that vaccuum, but we don't have a lot of physicists here on the forum, so I will leave that analysis for another day.
All we shooters know is that thick wads travel a lot further than thin wads, and that patterns seem to " donut hole " on us when we use heavy cushion wads behind the shot, where using thin cards give a more evenly distributed pattern of shot on target. We think that ' donut " hole pattern is caused by wads pushing on the column of shot in mid-air, but for most of us, we just don't know for sure what is causing it. Its hard to believee that a light weight cushion wad, even wet with oil, or moose milk, can catch up to, much push the heavier column of shot in front of it, so as to create that donut hole pattern.