IMR Powder

Rifle Powders

  Reduces copper fouling and insensitive to temperature change
4166 This fine, extruded propellant is the first in the series of Enduron Technology powders. IMR-4166 is the perfect burn speed for cartridges like the 308 Win, 22-250 Rem, and dozens more. Similar burn rate as Hodgdon Varget.
4451 Another new Enduron extruded powder, IMR-4451, gives top performance in the venerable 30-06, 270 Win and 300 WSM.

A top performer with such great cartridges as the 25-06, 270 Winchester, 280 Remington and 300 Win Mag. Falls directly between IMR4451 and IMR7977 in burn speed, providing top performance for all big game cartridges. 


The slowest burn rate Enduron® Technology powder. A true magnum propellant yielding outstanding performance in the 300 Win Mag, 7mm Rem Mag, and 338 Lapua. Loading density is perfect for magnums, contributing to superb uniformity. 

8133 True magnum propellant yielding outstanding performance in:
• 6.5-300 Weatherby
• 264 Winchester Magnum
• 28 Nosler
• 300 Remington Ultra Magnum
Slowest burn rate
Enduron® Technology powder Performs comparably to Hodgdon Retumbo

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