Ron - now I feel a little better and not worried about your health (at least from a bad barrel). If the rifle was unfired as you said it looked I guess it wasn't coated with a preservative at the factory well enough. Either that or the previous owner swabbed the bore and didn't adequately apply a protective rust inhibitor in it.
I bet some fire lapping using a full bore conical will clean that up pretty good.
You got yourself a real shooter there. Congratulations.