This solvent is specially formulated to effectively clean and neutralize the harmful fouling left in the bore from Triple Seven and other black powder substitutes. T17 also helps to remove plastic, copper and lead deposits that could affect the accuracy of your rifle. A micro thin layer of protectant is left in the bore to prevent rust and corrosion and aid in easy loading. The active ingredients of this solvent penetrate even the most caked on fouling and helps to restore the bore of your rifle to factory condition. T-17 Products are specially formulated for use in cleaning away fouling from Pyrodex(R), Blackhorn 209(R) & Triple Seven.