SinterFire ammo is specifically designed for safety when shooting at indoor ranges or at steel targets. The company makes ammunition loaded with frangible, lead-free bullets and lead-free primers, making it ideal for indoor range training. They utilize bullets made of a copper and tin composite produced using a proprietary heat treatment process. Loaded in the United States and engineered for indoor shooting and for preserving the life of steel targets, SinterFire is among the most consistent, reliable brands for indoor shooting. Choose the best for indoor training, choose the originator and the innovator, trusted by government, law enforcement, and military personnel since 1998.