IMR 4320 is a medium-burn speed propellant with short granulation and easy metering characteristics. It is perfect for the 223 Remington, 22-250 Remington, 250 Savage, and other medium burn rate cartridges. 4320 has long been a top choice for the vintage 300 Savage cartridge as well. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data.
