I don't think I can get sufficient lighting to give you a good look down it. The problem with cleaning it is that I've spent hours working on it and have gotten nowhere. I ran patches down it and when they came out clean I put a wire brush through it and that scraped off a ton of rust. This process continues to repeat itself over and over.
Does the rifling look to be in at least serviceable shape?
I've salvaged barrels that were in fairly rough shape and turned them into fairly decent shooters.
Try this: Plug up the touch hole/nipple, and then fill the barrel up full with a penetrating oil like Kroil or PB Blaster. Lean it up in a corner and let it soak 24 hours or better. Then use some of the green brillo pad or just regular steel wool around a cleaning jag, and set to work scouring that barrel. It may take a bit of elbow grease, but it'll get much better results than the wire brush. Keep the steel wool fresh and keep it well oiled. Let the gun tell you how much scrubbing it needs. Every once in a while flush out with more oil and run patches down to see if you're making progress.
Once you've got it cleaned up to your satisfaction, clean it as normal, then go shoot it! You may be surprised.
Edit: longcaribiner beat me to the punch. His method is more hi-tech than mine, but mine has worked for me. I'm sure that either method will be better than pulling your hair out trying to clean with a wire brush.