IMR powder production dates back more than 200 years, when E.I. DuPont founded the company. The IMR series of powder is trusted by reloaders all over the world and is suitable for a wide range of reloading applications.
IMR 4320 has short granulation, is easy to meter, and is ideal for cartridges with medium burn rates such as the 223 Remington, 22-250 Remington, 250 Savage, and others. Long regarded as a top choice for the vintage 300 Savage cartridge.