IMR Releases New Enduron Powders

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Re-loaders out there, take note, IMG powders has released a new line of powers for rifle. Notable is the built-in anti-copper fouling compound and insensitivity to temperature (ie more consistent velocities).

intermediate caliber guys may be disappointed. The first releases in the line are for .308 and larger cartridges.

Full Press Release Below:

IMR® Introduces Three New Enduron™ Technology Rifle 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 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 imrpowder.com or check the 2015 Hodgdon® Annual Manual.



Nathan S.

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

Nathan can be reached at Nathan.S@TheFirearmBlog.com

The above post is my opinion and does not reflect the views of any company or organization.


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  • JD

    Given the powder shortages, if a powder company releases a new product, but we can’t buy it, have they really released anything?

    • M1911

      Exactly. What is the point? You can’t get any of their current powders and I’m sure you can’t buy these powders either.

    • sadlerbw

      Well, the press release does state they aren’t expected to be available until early 2015, so it’s not like they have over-promised yet. More than likely, they have a production run scheduled for this stuff around that time, the powder will be available for a little while until everyone panics and snaps it all up, and then it will be out of stock until the next run…just like every other powder right now. At least powders seem to be lasting a little bit longer at the online stores before they sell out. Not long enough to span production runs, but they seem to last more than a day at least!

    • david

      Agreed. How about getting some stock of existing product on the shelves first?

    • JumpIf NotZero

      Correction: PISTOL powder shortage!

  • Lance

    You mean IMR there is no IMG powders Nathan. But good news I prefer IMR powders to Ball powders they burn alot cleaner.

  • Chemiker

    Will they have loads for the Garand? It is important to choose the right prowder to get the right pressure curve for the Garand. Yes, there are devices available to alleviate this problem, but I prefer to use the right powder.

    • Brian Fulmer

      The IMR 4166 is listed with cartridges that do best with powder in the right burn rate range that is safe for the Garand. H380 for 22-250, for example. I can’t imagine using it over Varget, but it should be safe.

  • woooo

    hooray, new powder that i don’t have any data for, will be more expensive, and even harder to find than the other powders out there, with almost no benefits.

    woo.