Vihtavuori?s 3N38 powder is designed especially for competitive handgun shooting with high-velocity loads in 9 mm and .40 S&W cartridges. It?s a single-based tubular powder type and one of our small granule powders (06 mm length x 06 mm diameter). The 3N38 is a popular powder for practical shooting especially among IPSC and USPSA shooters. A relatively slow-burning powder 3N38 is a perfect choice for making Major loads with good accuracy and clean-burning characteristics for which Vihtavuori is renowned.