barrel groove pics

[fyrewall]

One for Frank

Here we have an actual photo of serious damage & I am inclined to believe it. The logic is all there - brush bristles loaded with hard abrasives of MOH 6-7. The brushes being threaded into a much heavier cleaning rod providing turning resistance. Seems likely the abrasive loaded bristles would skip over lands. A tight fitting patch should follow the rifling without skipping. Existing gouges would collect additional abrasive and become enlarged. Supplementary data suggests this is not a slow process.

I clean my nylon brushes every time with hot soapy water or Isopropyl alcohol. If I ran a mile of so of nylon monofilament across the outside of my barrel I probably would see a groove. I would probably also see a groove if I ran a 1/4 mile of bronze wire across the same barrel. Imagine, that stretchy nylon monofilament rubbing on a spinning steel prop shaft.

No more abrasive dipped brushes for me - limited amount of abrasive on tight fitting patch/jag screwed into easy turning cleaning rod to remove carboom.

 

[urbanrifleman]

Flitz........I'm a believer.!!!!

Have a 6.5 SAUM barrel that I recently setback cutting off the tenon and rechambering .100 short with a .100 short reamer. Nesika K in a 35# heavy gun .

The barrel had not been fired since 2011 and had 850 rounds on it......at the end of it's life but worth a try for another few hundred rounds. I had previously used JB during each cleaning session but did not have a bore scope then to examine the results .

The barrel now breathed fliers like a dragon.....free recoil. Chaotic load development, with flags at dusk, zero wind .......group in the 1's or 2's followed by one with fliers in 3's to 5's.

Decided to look at the bore after reading this post since I now have a Hawkeye. Yup carbon layer on first half......alligator skin type.

Let it sit overnite in Wipe Out And then began working on it . After threes hours of various cleaners and abrasives these are my findings .

1. Scrub with Butches and bronze brush several times. Little results.

2. Soak in Carbon Killer followed by scrub with bronze brush. Repeat several times . Little results.

3. Soak in CLR followed by scrub with Montana Copper Killer (I ran out of Butches). Repeat several times. Little results.

4. Short stroke JB on tight patch followed by Copper Killer and bronze brush . Repeat several times. Little results .

5. Short stroke Flitz on a tight patch followed by Copper Killer and bronze brush. IMMEDIATE results. The barrel felt smoother while cleaning out the Flitz and the brush started to squeak like new. I would guess 80%_90% of the carbon was gone .I repeated the Flitz application 3 more times. 100% of carbon now gone....or at least I can't see any .

Now if it shoots .

I saw similar results. Flitz was better than anything and most of the others did very little if nothing. Using patches anyway.