I have to agree with the guys that you need better patch material. I have been shooting some drapery material for years with good success...but you definitely need something with a close weave. Given your rough bore, you might need a better lube than spit, but there are many options out there. None of the options are wrong, just different. The suggestion of more powder is probably right also...and you might try some 3f black.
Even with a so so rough barrel, it should shoot a respectable group.
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