IMR 4451 1lb Powder IMR Enduron 4451 is a versatile, match‐grade propellant with a mid‐range burn speed in the Enduron line. It is an extruded powder and is perfect for cartridges like 270 Winchester, 30‐06 or 300 Winchester Short Magnum, among others. 1lb IMR 4451 Powder,
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