Any gun store can sell you a commercial preparation which retards
barrel fowling in black powder weapons (I gather this is what is
meant by "antique guns").  I hope you aren't planning to fire an
antique without having it thouroughly checked out by a compentent
gunsmith!  This could be very dangerous ....
 
Otherwise, in my black powder shooting days I used to use Crisco (or
equivalent) on patches.  This worked fine but smelled a tad peculiar!
 
Stan Copp
Anthropology
Langara College
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