I thought at first it was pitting then noticed it was built up in the grooves. Reminds me of the old varnished/burnt oil under the intake manifold on an old runout V8 engine.
I have tried sweet's, JB bore paste and Hoppes #9 and my arms and brushes are about worn out. So any good ideas to cut through this stuff. I thought maybe plugging the muzzle and filling barrel full of safety clean or some other solvent or maybe heating the barrel and then scrubbing the dog out of it.
Anybody been down this road before?
Thanks,
RJS
I went to a barrel cleaning seminar that Kenny Jarrett put on in January, 2001 at the SCI Convention.
Kenny says you are looking at a combination of powder fouling and jacket metal fouling in layers. He showed some interesting videos of barrel exams with a microscopic lens and a fiber optic feed back to his videocam
He recommends cleaning with Shooters Choice, followed with Sweets 7.62 to go after the powder adn the metal.
Your other alternative would be to use one of the electrolytic bore cleaners.
I used t do a lot of load development for friends using their rifles. I asked them to buy the dies, and I kept them for payment. I had some pretty dirty barrels, fortunately I have not had a barrel that badly fouled!
jim dodd
------------------
"if you are to busy to
hunt, you are too busy."
If JB paste won't get it out, it must be very hard. If it is glazed powder fouling try Ed's Red. (Equal parts K1 kerosene, transmission fluid, low odour mineral spirits and acetone.) Or just try the acetone. Use in an open area away from flame. If Ed's Red won't shift it, it's not powder fouling.
I suspect it's not powder fouling, but it's in a weird place for pitting.
Don
Another thing that may help is Outboard Moter combustion chamber cleaner in a spray can. It is sold at most boat shops. It is petroleum based and foamy. You can spray it in the bore and leave it over night. Possibly this would help soften it. I'll bet a warm bore and Ed's Red will probably do as well though.
Scott