After a shot is discharged, red residue/ little drops are formed at the muzzle and tip of the cleaning rod- any idea what causes those? It was a "regular" load of 70gr 3F in a 20ga x42" smooth barrel, regular weather, no humidity, no wind, beautiful sunny day. Powder is from the same batch I have used before on this and other guns and did not get any red droplets at the muzzle. It cleans easy, clean barrel is in perfect condition.