Thanks, guys. Yes, it's an original 1869 Sporter, so it takes the cases with the thicker rim. It's in beautiful condition and I sure would lke to shoot it a few times just to see what it does. I've picked up a few bits of information along the way that y'all have contributed greatly to. Thanks!
That's Chambersburg, PA, about 25 mi. west of Gettysburg, and yes, I love the battlefield.