Borescope

[7mmweatherby]

Kmoore

Have you tried soaking with  kroil and leave for days I do this to my S&W 686 after fired bunch 38spl get stubborn carbon loosen up in front of case mouth …..if left go no longer chamber 357mag gets hung up in carbon could cause extreme pressure if try forcing round in cylinder

[kmoore]

I have not tried it but read about that oil. I looked to get some last week but local hardware was out.

[Grouchy]

Kroil is a lot more than gun related. It's a great penetrating oil for a bunch of uses. Unlike WD-40, it is a real lubricant.

[zoniezonie]

some bench rest shooters use a combo of JB paste and Kroil to clean their barrels .  I use it all the time kind of a light lubricant / penetrating oil.   normally I order several 8 oz cans and keep it around for other things also.  Sometimes I will use JB Bore bright it's more of a polishing paste it's another one of those I had to try out.  Kano Kroil is one of those I keep on hand.

[Dino82520]

I've been using Ballistol with J B paste. It does a good job as well. Anyone else tried Ballistol, compared?

[PARA45]

Have you tried Bore Tech carbon remover?  I swear by Bore Tech products and have been using Bore Tech bore cleaner and copper remover with great success. 

[PARA45]

Received borescope (teslong) unpackaged to my surprise was how sharp and clear images is .I borescoped my r700 30-06 that going be sending to Jim Hart for barrel replacement that accuracy fell off last spring and summer got much worse to point after few rounds falls completely off anyways after scoping told the tail rifling chipped all up right out from chamber …..borescoped my terramark 6.5 -300 very sharp and smooth ……..very pleased with teslong borescope

Looks like you like this borescope.  Is it worth the money?  I've been kicking the idea of buying one.  Thanks.

[7mmweatherby]

This first one I have owned……was recommended here on nation and does show what’s going on inside your bore and not hard to setup just follow the directions that comes with it and not all that expensive…….. very knowledgeable folks on weatherby nation forum I don’t post that much but I do check out what’s going on from time to time and read up on lot interesting topics that has help me out in the past

[PARA45]

Cool, thanks!!

[kmoore]

Update, I have inspected 14 of my rifle's barrels with my teslong borescope. Searching the web, I found what I described in the chamber is commonly called "fire cracking" a friend who owns a rifle building gun shop said its "Heat cracking".   
Someone posted a good photo of it on here. My buddy said it's actually damage to the metal and cannot be removed without a reamer.
My Mark V in 7mm wby, has a blackened burned wood type look and texture. My 7mm rem mag has it as does a FN Mauser action in .358 Norma Mag. Some newer rifles just have a small narrow ring of it that appears only as a blacken area. The 3 rifles I listed all look like blacken burned wood.
My buddy also said this, after scoping thousands of barrels looks can be deceiving. Some look like crap and preform outstanding while others are bright and smooth that don't shoot worth a hoot. Clean the barrel when needed, but if it shoots accurately don't mess with it.
All of my rifles either shoot well or I sell/fix them. The 7mm wby shoots 3 shot groups at 100 yds some at about .50 of an inch, all loads I have used shoot around or under 1 inch. At 300 yds the 3 shot groups vary plus or minus 3 inchs. Not match grade gun but fine for hunting. At 65 years old I am not sure my eyes will let me shoot any rifle much better.