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. sep 2 / 7:02pm
from my books and reading, i've never seen any recommendation to use "filler" (like corn meal, cream o wheat, etc.) - just the opposite.
there's a photo of an original 1850 advertisement for "colt's patent repeating pistols, army, navy and pocket sizes (beware of counterfeits and patent infringments)" showing what loooks like a dragoon or walker with loading instructions to wit: "...without wadding or patch,...."
you can see it on page 56 of "percussion pistols and revolvers: history, performance and practical use" by bates and cumpston.. in short, it's not recommended..
conspicously missing, however, is the advice to seal each chamber with any "grease" to prevent frontal chain firing, so perhaps a little common sense should prevail regardless.
personally i use felt wads as filler only when the space between the round and barrel is greater than 1/4" and always put some bore butter for "grease" on each chamber.. do what's best for yourself.
~d~