This solvent is specially formulated to effectively clean and neutralize the harmful fouling left in the bore from Triple Se7en and other black powder substitutes. T-17 also helps to remove plastic, copper and lead deposits that could effect 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 help to restore the bore of your rifle to factory condition.