I bought one a while ago and I kept forgetting to use it to clean out the powder barrel and bottom of the barrel before a match! Well Saturday night I finally remembered to shoot into my long rifle and boy was there some goop and tar and who knows what that came out! The gun had been well cleaned (I thought) a month ago after our monthly match? No so well I guess and NO hang fires or other issues at the start of the match!
To night I hooked it up again and the sludge came out again and I steamed it very well until the stuff coming out of the barrel was clear. I had to remember to wear gloves as the barrel gets really hot! I wiped it and oiled it slightly before it cooled off. I am a happy boy for sure.