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The bluish streaks inside the muzzle are copper fouling, which oxidizes over time. Gunpowder residue and copper bullet jacket residue both periodically need to be removed from your rifle barrel. Very smooth bores with minimal machining and tool marks usually can be shot far more times before accuracy begins to drop off. Just how many rounds you can fire before degradation occurs depends on the quality of your rifle’s bore.

Typically, the faster the velocity of your cartridge/bullet combination, the faster fouling builds up (both carbon and copper) and the heavier it builds.Īt some point, accuracy begins to degrade, and to regain top performance you’ve got to clean all that fouling out. It’s copper residue that’s basically smeared off the bullet into the pores and microfractures of the steel barrel. It’s the soot-type residue left by the burning gunpowder.

The least detrimental to accuracy and the easiest to clean out is carbon fouling. Two types of fouling build up in rifling.

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