IMR Enduron Technology Rifle Powders

IMR Legendary Powders


Shawnee KS, IMR Legendary Powders has created a new line of sophisticated extruded powders that are loaded with more features than any other brand of powder available today.  Enduron™ Technology features a built in copper fouling eliminator, insensitivity to temperature extremes, small sized grains for easy flow with an ideal loading density, and there are no ingredients considered harmful to the environment.

IMR Enduron Technology Rifle Powders
IMR Enduron Technology Rifle Powders

IMR 4166™ is the first in the series of Enduron™ propellants.  It’s a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington, 257 Roberts and dozens more.  IMR 4166™ is a positively versatile, match grade propellant.

IMR 4451TM  Another new Enduron ™powder that gives top performance in the venerable 30-06, 270 Winchester and 300 Winchester Short Magnum, to name just a few.  This propellant is ideally suited for many mid-range burn speed cartridges.

IMR 7977TM   is the slowest burn rate Enduron™ Technology powder.  It is a true magnum cartridge propellant with outstanding performance in such cartridges as the 300 Winchester Magnum, 7mm Remington Magnum, 338 Lapua and more.

The new IMR Enduron™ Technology powders will be available at dealers everywhere in early 2015 in 1lb and 8lb containers. For more information and data visit or check the 2015 Hodgdon® Annual Manual.