With more than 30 years in the business, people trust Accurate Powder 4350 Rifle Powder. As with other powders manufactured by the company, this smokeless option undergoes intense engineering and lab testing to ensure precision and performance are optimal. The 4350 formula is a single-base, short-cut, extruded powder used for rifle shooting. Specifications and Features: Warnings from the Manufacturer: Do not exceed the loads displayed in the reloaders guide. Never mix any two powders regardless of type, brand, or source. Never substitute any smokeless powder for Black Powder or any Black Powder substitute.