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https://www.brownells.com/search/index.htm?k=Lyman+bore+scope&ksubmit=y
Foamers work well on copper, not so good on carbon, if at all. Foamers and liquid form of foamers work very well used in combination with good Bronze bristle brushes. Repeated soaking with foamers or liquid form of foam, time and time again did little to remove carbon from calibers like 6 Dashers(R#15, 32g), 6.5x47 (37g), 6.5 Creed (42g), with top quality SS barrels with only 40 rounds on the barrel, not shot real hot. Then the 7 mag working up loads with 25 shots in between cleanings(66g of powder).
Cartridges like the 22/250 AI, 22-243 AI carbon foul so hard that it is necessary to scrub around 25 shots to keep the bore clean, and powder choices do have an impact on frequency. A 22-243 AI fired a hundred times without a thorough cleaning is a serious sack of hell to deal with.
From these posts, it is obvious some of the nice people contributing that do not have a bore scope. I can not say enough good about that $200 lyman bore scope. The Lyman is a digital image, while the Hawkeye is a true optical image. The lyman is more than adequate for a shooter to determine if the carbon has been removed.
Copper is easily removed, but often it is in layers of carbon, then copper, then carbon, etc.
It does not take many shots to cook the carbon so hard that it will not show black on tight fitting patches using punch type jags.
I have been duped into buying more "Snake Oil" types of cleaners than most because I want and hope that I will find a product that will in deed do what it claims.
Ed's Red is a darn good concoction to put together, and a product called Witches Brew is sold by a world class machinist/gunsmith. Good brushes carry the heavy load on cleaning. I would challenge you to measure a new brush with a caliper, plastic or Bronze bristle, put 50 strokes down the barrel, measure the brush again...get ready for a shock!
For guys that have to clean on the kitchen table using non stinky types of cleaners, Bore Tec has been some of the best I have used in conjunction with Bronze Bristle brushes. JB, Issio, and easy to use Montana Extreme non stinking Copper cream dig out the hard carbon. Calibers like 7 Rem Mag & 300 Win mag will humble a guy in his thinking when he has a bore scope. The most experienced of us that have been using a bore scope for 25+ years are often humbled by our Mind Set with some calibers in carbon fouling removal.
Again, go in with a shooting buddy, cousin, or brother. Split the cost, and get a Lyman bore scope. Ignorance is Bliss up to a point.