I have slugged both barrels. I am thrown off a bit as to how to measure. There is a groove directly across from a land. So I can't get the true bore (or don't know how). Either way if someone here can advise, I would appreciate it.

There are 8 ways to do it; here is an article that explains them. What I do is get the bore diameter using gauge pins, and then you can add twice the rifling depth to that. From your slug, you get the bore diameter plus one half of the rifling depth.
http://www.texas-mac.com/Measu...dd_Groove_Bores.html