Semolina for me. Have used it in my Rogers and Spencer for about 8 years and now use it the Ruger old army as well. A full 7cc scoop on top of the powder in the Rogers and 2 leval scoops in the Ruger bring the ball to where i want it and top it off with a coating of wonder lube. The 7cc lee scoop is just the right size for getting the stuff in the chamber without loosing too much but i have also used a small vile cut down to size to give the right measure which was fine till the handle broke off for the 3rd time. The lee scoops are cheap, very strong and dont clog up like a flask.
Theres lots of scope for personal preference when loading muzzle loaders and im sure there probably is a definative way of doing it, i just like the way i do it. I dont care about the cleaning or a few particles of spilt filler. The wonderlube keeps the fouling soft till i clean my guns, our range is not the sort of place where you nead to worry about a bit of spilt filler and i like the smell of burning semolina. Tim