IMR 4320 8lb Powder 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. 8lb IMR 4320 Powder,
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