I am very familiar with the Skychief load as it is a hot topic on the M/L Forum. Everyone that tries it expecting the wad to blow the pattern is surprised when their load tightens up.
I had Caywood jug choke two 12ga barrels for me, I gave one to a friend and kept one. My friend's barrels choke was cut perfectly and shoots a great, tight pattern, mine was apparently poorly done and never shot a pattern better than modified with any wad/powder combo.
My first attempt at a Skychief load was disappointing but I put a dry cushion wad over the shot. I tried 2 1/8" hard cards and got a little better success but not what I had hoped for.
Just before turkey season I gave it another try, lubing the 1/2" wad this time. First I put the wads in a bowl of olive oil and heated them in the microwave to saturate them, too much oil, they were a mess to load.
For my last few shots I just rolled the wad in the olive oil quickly, it still absorbed the oil like a sponge and loaded without the oil dripping down the sides of my barrel.
OK, here it is, from a barrel that never shot a tight pattern; 90 gr of 1F, 4 thin cereal box wads (wheaties) 1 1/2 oz #6 shot and a 1/2" oiled cushion wad over the shot, 27 yards, the total pattern is about 18" in diameter at that distance. I edited the picture, the one I initially put up was not the one I shot the other day and might have been shot twice.
My buddie's gun with the perfect jug choke will shoot about the same pattern at 35-40 yards with the Skychief load.
Here is the printable turkey target I use;
http://www.guncustomizing.com/targprt.htmHere is my pattern at 25 yards before the Skychief load, probably copper plated #4s, still pretty thin. I didn't have the camera's date set correctly;