try this
take some 2F and put in plastic container like film canister with some lead shot as stated and then add some pure alcohol and some extra charcoal ( 1/12th -1/20th the ammount of powder) and tumble ( dont shake )
leave for a hour to tumble
then empty and add a tad more alcohol and roll into a ball
then get a fine as possible brass seive and rub against the seive the powder that results is course, but, when dry rub between two sheets of paper and this is ultra fine
the alchohol allows the grains to seperate but keep thier chemical composition in fact add's a touch of "woof" ( heat) so it ignites easier and ingnites the main charge better
it will make a tad more smoke ( white) than usual touch hole powder but you get a far better spark
cheers
jack