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More Black with Bronze Phosphor Brush


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Old 01-10-2014, 01:46 PM   #31
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Originally Posted by dexntex View Post
Brushes are normal phosphor bronze. The cleaning rod is a high-quality Dewy rod, black-nylon-coated single-piece steel. Since the pesky black problem was observed with a new barrel and brush, I'm beginning to wonder if the black is coming from the nylon on the rod after years of use, but why just after brushing and not with a patch, I don't know. I do use a bore guide. I too would love to have the patches analyzed. I'm starting to accept though that the black is not coming from a dirty barrel.
I have no doubt the bronze is normal. Look at the braided metal shaft the bronze bristles are attached to. Is it aluminum. Over.
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Old 01-10-2014, 09:57 PM   #32
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It is a Hoppe's (or Outers?) phosphor bronze brush. The shaft is silver-colored but I believe it is not aluminum and is probably steel because it is strongly attracted to a magnet (and not just the base part).
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Old 01-10-2014, 10:47 PM   #33
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My experience is this is more likely to happen with a dark

bore. I would worry about the crown on the muzzle with

excessive cleaning.

Try this; use a jag with a rag instead of the brush with the solvent.

Then take a worn brush, cut a patch to cover the brush, and use it

to swab out the solvent. Don't forget to swab out with oil, when

you are done.
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Old 01-10-2014, 11:28 PM   #34
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It is a Hoppe's (or Outers?) phosphor bronze brush. The shaft is silver-colored but I believe it is not aluminum and is probably steel because it is strongly attracted to a magnet (and not just the base part).
Then I simply don't know. A mirror shiny bore and sharp rifling is where I stop cleaning and call it a day, like most owners. I would guess that there is always a layer of oxidation, which, once removed, quickly builds up again. Good luck with your research.
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Old 01-11-2014, 05:41 AM   #35
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Thanks Mercator. Thanks for sticking with the topic. It's still a bit unresolved but more observation may eventually resolve the problem. But one thing I will change is not getting so upset with black patches when I think the bore is clean. Thanks for your help.
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Old 02-05-2017, 06:40 AM   #36
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I might have overlooked this already, but I was having the same issue with my Weatherby mark v stainless 300wtb. The reason Im concerned is because my accuracy has went to crap and as you all probably know, the first thing to look at when accuracy becomes an issue is a clean bore. So one thing I did once I had suspicions on the brush causing it to become black, was to take a copper brush and scrub the outside of the barrel (which was clean and had no powder residue or fowling). After scrubbing it I ran a patch over it and it was the same color as the patch going through the bore. I think the copper brush is causing the barrel to appear dirty when it is already clean.
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Old 02-05-2017, 11:41 AM   #37
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Resurrecting a thread that's 3 years old? It happens.

If your accuracy was good and has recently gone to crap, thorough cleaning is a good idea. Another area to look at is the crown of the barrel. Is there any scratching or other damage there?

Imperfections at the exit of the barrel allow the hot gases to leak out unevenly around the bullet at the moment the bullet is leaving the barrel. This can cause the bullet to wobble slightly in flight. Like a football pass with an imperfect spiral, accuracy is compromised.
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Old 02-10-2017, 04:35 AM   #38
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So one thing I did once I had suspicions on the brush causing it to become black, was to take a copper brush and scrub the outside of the barrel (which was clean and had no powder residue or fowling). After scrubbing it I ran a patch over it and it was the same color as the patch going through the bore. I think the copper brush is causing the barrel to appear dirty when it is already clean.
havener78, thanks for the additional info. It is very helpful. That was a good idea to run a copper brush on the outside of the bore. It further supports the idea that the copper brush is the problem with the dark patches and not a dirty bore. Nylon brushes don't cause the blackening. I believe the copper brush is abrading into tiny particles which appear black, like colloidal silver which appears black because of tiny, nanometer-size particles. Your accuracy problems appear to be something other than a dirty bore. Thanks for contributing to understanding this blackening problem.
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Old 02-16-2017, 06:58 AM   #39
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Yeah google searches have no preference if it was posted yesterday or 3 years ago : ) Looks like the crown is in good shape. Im leaning towards the pressure bedding. I took the stock off after a Kodiak goat hunt to clean the salt water spray off of everything and since then it hasn't shot right. Basically groups were well under a MOA to 3" groups. I'll be messing around with the torque on my receiver screws. I also checked the scope and sent it into Leupold to have them look it over so Im certain the scopes ok. I did get a some copper fouling to come out of the barrel (didnt seem like much). I will be shooting some hand loads to mess around with the pressure bedding as soon as it warms up enough Thanks for the info. Any and all ideas are welcome at this point.
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Old 02-16-2017, 01:07 PM   #40
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No mention has been made of the condition of the rifle or bore, before you got it.

IME, it's a lot easier to keep a clean bore clean, than to clean it, once it's gotten

out of control. Calibers with shouldered cartridges generally take more work.


Case in point:

I got a Garand used, and at some point somebody rode it hard, and put it away

wet(dirty). The barrel "sewer piped", probably corrosion from old ammo, possibly

even during the war, as it is a '43 manufacture date. I've spent all nighters trying

to get that barrel close to clean, not happening.

OTOH, a 44MAG (straight walled cartridge) with a new barrel cleans up pretty fast.

Get a bore light, if you don't already have one.
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