44 40 began life as a lead bulleted pistol round. Do as norsk has says clean it is step 1. I would then fire one of those bullets into the dirt and recover it to see if theres rifling engagement. If you dont cast or know someone who does track down the local cowboy action club someone there will be able to help. Dont worry about a pitted bore, I have a snider carbine with a bore that looks like the surface of the moon but it shoots within 18 inch at 100 yards which is pretty ok for a snider.
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