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you can reduce copper bore fouling measurably by dropping all your unloaded projectiles in a small plastic container and pouring in some MOLY powder lube, and shaking the contents for a few minutes, this will leave a micro coating on the projectile surfaces
repeated use of moly spray used by swabbing the rifling in the bore with moly before you put the rifle away after its cleaned and before you shoot the gun when you can do so also tends to reduce copper fouling
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