dakine999
You wll not find many people supporting the use of Bore Butter - but I am one of them... I use it in everyone one my barrels including my trap gun barrels. It really does reduce plastic fouling.
However, I would not use it the way you are - the barrel, for sabots, really needs to be clean and dry (you actually might be increasing your possibilities of fouling the barrel) - the sabots will lubricate themselves. Clean the barrel with a good solvent and a scrubbing - then lightly oil with a quality product. When you get ready to shoot it - dry swab and get it as clean and smooth as you can. Then try sighting in your gun - you may need to damp swab in between shots, there is a ton of different solutions for this including old fashion spit. Sighting in or recreational shooting I use a zip lock bag of prepared patches treated with windex - then a dry patch, hunting, just an old fashion spit patch.
good luck - there will a ton ofother people that will add lots of ideas...
I am sureCayugad will jump in here he has a Black Diamond and is quite fond of it...