Well MM most muzzle loading shot gunners have their own preference.
I personally believe if you stick to a volume load you can not go wrong.my loading proceed er is as followers if a flinter plug the vent with a pricker for a percussion never remove the spent caps or lift the hammers from the previous shots.Next take the required charge of powder and pour it in the barrel take a 1/8 card wad and ram it onto the powder next take a volume charge of shot and pour it into the barrel and finish with a 1/16 overshot card wad.Some load powder ,card wad, felt wad ,card, shot, card wad,if you prefer this way always place a card on the felt wad ,if this is omitted then it will surly blow your patten.The reason for the pricker and not removing the spent caps is because when you ram home your card wad onto powder it blows the powder into the nipples,thus with the pricker in place and the hammers down reduces powder been blown out through the nipples and vent and thus reduces a hang fire.
Enclosed are a volume loads I use for different gages,here in the UK we measure in drms,27.5grains to 1dram
10 gage 3.1/2 drms to 1.1/2 oz shot
11 gage 3.1/4 drms to 1.3/8oz shot
12 gage 3drms to 1.1/4 oz shot
14 gage 2.3/4 drms to 1.1/8 oz shot
16 gage 2.1/2 drms to 1oz shot
Feltwad
------------------
A Flint Lock will not secure a chicken house door