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

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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