[fxdrider]

I was just given a Springfield Hawken .50 cal. rifle. The exterior metal surfaces were coated with some rust - I was able to make short work of it with some steel wool and Hoppe's oil. However, the bore is coated with a bit heavier layer of rust. This is my first BP gun, so please pardon my ignorance - but how does one get rust out of the bore?

Thanks.