Extruded flake powder is great for 12 and 16 gauge shotshells for clay target and light field loads. Also a fine choice for target loads in handgun cartridges such as the 9mm Luger, 357 Magnum, 38 Special, .44 Magnum, .45 ACP, and many others.
Brownells Christmas , Issue:5X, Page:018
Big Book Catalog, Issue:68, Page:545
Sinclair, Issue:5B, Page:093