As I understand it, American Pioneer was invented to be a substitute powder for Black Powder Cartridge guns for SASS shooting. Velocities have to be kept low to prevent injuries from ricochettes off the steel bang plates. AP is bulky, so it fills the cases of the large caliber pistol and revolver cartridges better than do most smokeless powder. The company is trying to push it as another powder to use in percussion ML rifles and shotguns, but everything I have heard indicates its an expensive alternative, that gives slower velocities compared to similar volume measured black powder charges. If you are CAS shooter, use the stuff. The primers in the pistol casings are hot enough to set it off and you will get the desired results. If you are shooting traditional BP guns, either percussion or flint, then stick with Black Powder. If they don't want to carry Black Powder, then by it from Powder, Inc. of Graf & sons, and have it shipped to your house. Save money by going together with some shooting buddies to order a larger quantity of powder, so you can divide the HazMat fee of $20.00 per shipment among all who order. The HazMat fee is the same if you order 1 pound, or 50 pounds of powder. You do the math. Why pay twice as much for a substitute powder that is not as good, deteriorates with age, and has a narrower range of application than black powder????