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Internet digging indicates that few commercial products do much for copper fouling in the barrel from shooting jacketed ammo. www.frfrogspad.com indicates only a product called KG12 or a homemade ammonia solution did much good. Others, including Hoppe's 9, apparently did very little good. However, is copper fouling a problem with pistols, or mostly with rifles? Seems to me I read somewhere that at pistol caliber velocities, copper fouling was inconsequential. Any advice? Thanks, John