Before the model 12 16 gauge in post 20 came along my Brother-in-law gave me a 16 gauge single shot shotgun. Man that thing could kick. Got around to soaking the barrel with Hoppes overnight. Next day dropped the cord with a sinker on the end in the barrel and pulled a tight cotton cloth folded just right out the end of the barrel. What came out first was a round lead piece with a solid ring in the center with finger like extruded lead on front and back of it... Shot pretty good after that.