I was at the range a few months ago sighting in my 50 cal. Hawken, when the range master took notice. He was an old boy that loves smoke poles and is the regional president of the National Muzzleloaders Association. After some heavy recruiting, he brought out a spray bottle of simply green cleaner. Wetted a cut patch, and told me to use it after each shot to swab out the barrel. Once with the wet patch with the simply green, twice with a dry patch...for increased accuracy and less barrel fowling. He looked at my tube of bore butter and told me to throw it away, then with a wink went back to the range hut. I still use the tube of bore butter, and will until it is gone, and haven't noticed anything different in shooting after swabbing with simply green...but hey...he believes in it and he had some impressive target groups he showed me to prove it...