I have a .257 Weatherby Magnum that appears to have some serious layer fouling, especially in the first 4-5 inches of the barrel. I have tried lots of methods to remove it, and up until recently thought I was getting it out. I have tried mild abrasives (Bon Ami, JB's), but all they appeared to do was "polish" what seems to be almost bonded to my barrel. Then I would go shoot the gun, but within a few rounds I would be back to square one with this thing.

The other night I resigned myself to either removing everything in there, or ruining the barrel trying...what do I have to lose at this point

Anyway, I went and purchased two new bronze brushes (6.5mm caliber to get a little more "scratch") a bag full off patches and some Hoppes powder solvent.

I put a brush wet with powder solvent in and went 30 revolutions and then pushed the black gunk out with wet patches followed by dry. I have been doing this since and the crud finally appears to be dissapearing but it is a lot of elbow grease.

I'm starting to think that when it comes to hard carbon deposits there is no easy fix, just lots of brushing and elbow grease.

To Really get a bbl clean I like JB.

It is a "pain" to use.

However i learned a little trick from Aleko.

He mixes Pro-Lix with JB, then dips the brush directly into it and clean away, 10 to 15 strokes, clean the brush with gunscrubber, etc, patch out the bbl and repeat if necessary.

When you are done with the JB mixture, just be sure to get it all out of the bbl and chamber.

If you do not have Pro Lix any non copper removing cleaner will do. You do not want to dissolve your bush.

Repeated soakings and bronze brush work..

try some Marvel mystry oil, soak for several hours or per day then scrub with bronze and patch out the crud , repeat next day and so on, switch to some kroil, let soak , etc, Through some JB in there a few times, then some MMO again to soak etc..... Make a week project out of scrubin and soakin

300 try some snot! Some snot worked for me

A few days ago I bought a Blaser R 93 Tracker bbl in 357 H&H from a friend.

Like many people he did not ever clean it "totally clean".

Three applications of Aleko's technique have got it "clean".

I am going to shoot it around 60 rounds or so this weekend, sighting it in, getting it ready as my "all round thumper".

Well, I have tried a few things since my last post on this topic. The first thing I did was get the ingredients to make some "Snot". I couldn't find any Kroil so I settled for the Marvels Mystery Oil. I then got some of the Knights concentrate for muzzle loaders and mixed it up.

Then I went and bought some M-Pro-7 carbon cutter.

I already had some JB's bore paste on hand.

I went to work on my barrel that wouldn't show anything on a patch without any of these aggresive concoctions.

I started with M-Pro-7. I would soak the barrel with it really good for anywhere from 15 minutes to 2 hours and then hit it with a slightly oversize bronze brush. Afterward I would run a dry patch through and it would always come out brownish/black. After doing this for about 6 cycles I decided it was time for the Snot.

I applied it as noted in other threads by putting a healthy amount down the tube and letting it sit for a bit. Then I hit it with the oversized bronze brush for a number of strokes and then left it...overnight. When I pushed the next patch through it the thing "looked like a bird had crapped on it", just like smedley's experience. Mine didn't have quite as much "crap" on it as his, but the same stuff for sure. I tried this procedure again and no more crap, just a discoloring of the patch from the reddish/pink of the Snot to more of a brownish/black color. This indicates to me there is still carbon there.

Next I hit it with an overnight dose of Wipeout again. Patches that had come out white before were now colored pale blue. Once again indicating a layering of deposits.

I am going to back home tonight and give it the one, two, three punch treatment and see what comes out:

1. Snot
2. Wipe out
3. M-Pro-7

Hopefully I'm not getting any more out of it...I want to go shoot it.