After season is over for good, I plan on cleaning my barrel with boiling water. How do you guys seal your barrel off so the water dont run out of it? I used to use bore butter, do you think some of it might still be in my bore? Any tips or pointers will eb reatly appreciated.. I have a CVA Optima 50 Cal.

Also a rumor I heard that I would like to get cleared up, I heard that shooting Sabots wold leave a plastic coating on the inside of my barrel, is that true? I been shooting them and my barrel shines better than new.