View Full Version : What is this stuff lining the barrel
About 200 rounds down the barrel.
https://imgur.com/a/MnWe4Is
Copper fouling from the copper bullet jacket. Normal. When you clean it the patches may come out a little green looking
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Thunderpigeon
09-29-21, 14:45
You are seeing copper fouling. It can be removed with a copper remover such as Sweet's.
Deadman William
09-29-21, 17:08
You are seeing copper fouling. It can be removed with a copper remover such as Sweet's.
keeping in mind it's pretty hard and time consuming to remove, and likely has no impact on your guns performance
keeping in mind it's pretty hard and time consuming to remove, and likely has no impact on your guns performance
He will get to a point where he reaches copper equilibrium (blasting it out almost as fast as it deposits).
Sometimes that can be an accuracy 'sweet spot' that is consistent and lasts for quite a few rounds before a deep cleaning is needed.
If accuracy hasn't suffered, I would not worry about copper fouling.
What kind of barrel? Chrome lined? Stainless Steel?
FWIW, Sweets sucks at copper removal. I will, every so often, knock down the copper fouling in my Bolt gun 308. I used to use Sweets... then one time I followed up with Bore Tech copper remover, and there was a mess of green nasty left in the bore that sweets had left behind.
The barrel is a Faxon pencil profile nitrided barrel.
pointblank4445
09-30-21, 13:51
Unless your barrel has taken a sudden performance dump, put the borescope away and don't fret on what you see.
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