Patches still coming out black after bronze brush...

A fouled barrel has layers of carbon and copper. They react to different cleaners.

I suggest a patch with a mild abrasive, like RemClean or JB paste. It will take out carbon. Then leave barrel wet over night (muzzle down) with a good copper solvent (Sweets). I have bought used milsurps that took a week of this treatment to get clean.

I leave rifle muzzle down on a piece of paper towel. Muzzle down so the gunge runs out of the barrel, not abck into the bedding and trigger. The amount of gunge on the towel the next day tells me if another treatment is required (abrasive plus wet patch). Here is a towel form a rifle that needed 4 treatments.

CLEANINGPAD.jpg
 
I think I've got through two layers of copper fouling! Finally went from blue to yellowish brown back to blue twice. My vfg felt patches are coming today so hopefully them coupled with wipe out, kroil and jb will make Short work of it.
 
Turns out I had an almost clean bore.

now after 20 minutes after the wipeout, the patch comes out WHITE! Even on the VFG pellets, tried the brass infused pellet with ballistol scrubbed the bore 6 pulls some black came off on it, put a felt one with ballistol it came out a little dirty. Scrubbed again with the brass pellet another 5 pulls, another felt pellet dry this time and comes out a little black but not much.

Switched back to the jag and patch, put some accelerator on it zero colour, put some wipeout zero colour change. Waited 20 minutes tried again with a dry patch, came out CLEAN!!! Tried again with the bronze brush and patch CLEAN AGAIN!!! I think I will finally have a clean cold bore on this rifle.

Is there anything I should do prior to firing to prevent foulling? Should I be breaking it in again?
 
Next time out, bring ALOT of extra ammo... you may find that accuracy has absolutely tanked and groups have grown substantially.

Maybe you need 3rds to refoul.. maybe you need 13rds. Given the state of the bore AND that you had accuracy, there are plenty of deep pits and valley in the bore. That is not bad onto themself but you may need to fill them in before your bore condition stabilizes.

With that many rds in the bore, I would suspect the throat is getting a schnick long for your bullet which is showing up as an expanding group. You obviously take good data of your groups and shoot consistently enough to notice. Tweak the seating depth a bit and/or tweak your powder charge and see if that improves things.

Also, try an long bearing surface bullet. PM or email me...

If not, start putting aside money for another barrel as yours is going to drop in accuracy from this point onwards. Rem barrels usually come with very long throats so seeing groups opening up around 2000rds is not uncommon.

That is still very good accuracy from a Rem pipe. I wouldn't get hung up about a dirty bore... some barrels need it that way.

Jerry
 
Took it out today, I totally brain fartted and realized after the fact that I had to re-zero my scope. Which was removed to clean it during the last week. Took around 20 rounds until it was foulled, I started with middle target then top right in clockwise order. Loads were 41.7 gr 4064, 175 smk, FC brass g210m primers loaded to COAL of 2.820".


 
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