Save yourself some time, money and components - go to Amazon and buy a Teslong borescope for $50 and take a look at the inside of the barrel. You will be able to see how bad the throat is cratered, how much build-up of carbon and copper fouling you have, that will at least give you an idea of what you are up against otherwise it is all guess-work.
drover
+1
I bought the Teslong. I also have the Lyman bore scope. The Teslong is a better bore scope by a good bit.
