The bore on my recently acquired sporter Krag carbine looked like it had not been cleaned in 50 years.  Fortunately, the lands look good even if the grooves seem to have an accumulation of buildup.  I have worked in solvents and brushed a good amount with some little improvement.  The grooves seem almost lumpy rather than rough, but not smooth. Near the chamber, the grooves seem to have a stubborn buildup under "down hill" edge of the land and up to its top.  I detect no throat erosion.  At present the bore is soaking in Kroil.  I will brush again, but I wonder if some shooting might loosen up the junk in the grooves.  Can some of the junk be shot out?  Has anyone has success in cleaning up these old bores?  Is there a better way to do this?  I am really looking forward to shooting this dignified old rifle and am really pleased that I have it.  Thanks for your help and advice.