Looking thru a scope for the first time can be very confusing. You're looking at things on a scale most are just not used to seeing. I have a small angled scope that won't reach the middle of a rifle barrel but does the two most important parts, the muzzle & chamber/throat area very nicely. Being trained with scopes helps a lot, as I used them at work quite often as an aircraft inspector, usually in the engines. Taking your time is key plus you should insert the scope and do the inspection on the way out. It's easier to move the scope around that way. Having picture capability is also nice as you can post the pictures and ask! I've found a badly fire checked throat on my CHeetah (no real surprise there) and radial cracks just forward of the forcing cone on my Ruger Redhawk (twice! Ruger ultimately replaced the pistol) so they are definitely worth having. Cleaning can bit of a bear to deal with since just about anything short of bare metal can be confusing. I complicate things even more by moly coating most of the bullets I use in the guns I actually need the scope on. Not much visual difference between carbon & moly!
Old Rooster says he's not going to change the way he does things so he really doesn't need a scope... that's kind of the point, isn't it, to show you potential mistakes in cleaning methods?
A scope can be a great tool. It can show you a lot of things but you still need to put in the time to learn to know what you're seeing and then figure out the potential causes so you can fix them. Or just to tell you the throat is erroded enough it's time for a set back or new barrel. Of course, the accuracy should have shown you that without the scope. No matter what the scope shows if it's still shooting well, it's perhaps not as critical as you thought! My buddies WWII 8mm is proof of that... it shoots just fine for his purposes (iron sights for deer, which he seems to have no trouble killing). After shooting at my range, I offered to clean it for him. The first patch I ran down the barrel literally came out shredded to pieces! The scope showed the barrel was badly corroded, pitted and just generally ate up! But it still shoots as well as he can with iron sights, so why worry about it? There are definitely ups and downs in the scope world and it's not a cure-all for anything. It's just another tool in box that can help, if you learn to use it properly & learn to interpret the the things it shows you correctly.
Cheers,
crkckr