Buy Vihtavuori N320 Smokeless Powder for Handguns (1 lb or 4 lbs) is a fast-burning powder for use in light to mid-range target loads. The preferred handgun calibers for which N320 is used are 9mm and 38 Special. It has applications for using in calibers up to 44 Special and 45 ACP. N320 is one of the most popular handgun powders and can be used for a wide range of pistol calibers from 32 ACP to 45 ACP. It has become a favorite for many Cowboy Action shooters over the past several years. All Vihtavuori powders contain a decoppering agent to reduce fowling and keep your gun cleaner longer.