Introducing Vectan AO Smokeless Gun Powder, the AO is a medium-burning powder with colored flakes. AO is known for its consistent performance and is suitable for a variety of shotshell loads. AO's performance range puts it in the area of Herco, 900-X. and Longshot. This does NOT mean it is a direct substitute. Warning About Smokeless Powder:Do not exceed the loads displayed in the reloaders guideNever mix any two powders regardless of type, brand, or source Never substitute any smokeless powder for Black Powder or any Black Powder substitute