If you shoot a lot of old surplus ammo, you need Sweets 7.62. The ammonia in this cleaner will dissolve salts deposited in your barrel by old, corrosive-priming. Sweet's easily removes powder residue and stubborn copper fouling. It's a non-acid formula with 5 percent ammonia. Sweet's is also recommended by Dillon for cleaning carbide sizing dies where nickel or brass is sticking to the insert.