PC bullets are pretty much the only stuff fired down here, my club banned copper washed bullets (that many of us used) b/c someone thought they over penetrated the barriers....I've shot thousands.... they can lead a barrel, only when poorly used, Winchester re-manufacture 9mm down here and had been crimping the projectiles too hard, scraping/pinching the coating, that would leave a mess behind, these projectiles were also a tad too small....I had a heap of them, and figured out if I shot 30 or 40 of them at the start of a session and then finished with my PC coated loads it would clean the lead the crape ones had left behind...the ones I shoot are red and I never find a trace in the barrel....