New IMR enduron powders???

Discussion in 'Reloading' started by jaybic, Apr 12, 2015.

Help Support Long Range Hunting by donating:

  1. jaybic

    jaybic Well-Known Member

    Apr 8, 2009
    Hello all,

    I am getting some load data together for a couple rifles and was wondering if anyone has any ideas on the new IMR "enduron" powders.

    I will be loading for a 243ai 8 twist 26inch tube with 87vmax and 105 Amax and 105 vlds as well as loading for a pair of new 22-250ai rifles. The first one is a 26in 12 twist Savage factory tube punched out to 22-259AI (essentially a fire-forming tube to save wear on the next rifle), the other being a 27 inch 12 twist Brux tube in 22-250AI. I intend to shoot either the 55NBT or the 53gr Vmax(might try 40s in the factory gun for PDs) and have no idea where to begin or which of the three might be best in the AI versions of theses cases, the bullets I indend to use and the twist rates. I am just going to follow the info on the jug for the regular .223, .243 and .308 I have but just not sure about the AI rifles above. These are my main tournament coyote rifles and i want the 22-250ai to run fast and flat and the .243 running heavies for those bad ND wind days and longer shots.

    Any experience, ideas or insight and/or pros and cons would be most welcome and thanks for your time,

  2. Charters

    Charters Active Member

    Dec 6, 2008
    The Hodgdon reloading page has the new powders listed in their data. I've just started messing with the IMR 7977 in my 25-06, looks promising
  3. crazyhorse

    crazyhorse Well-Known Member

    Oct 31, 2004
    Used the 4166 for the first time yesterday in my 7-08. Showed promising accuracy but is EXTREMELY dirty. First patch through looked like it came out of a muzzleloader!
  4. 556

    556 Well-Known Member

    Feb 26, 2014
    I just tried IMR 4166 in my 308 today. The results are very promising. Below is my first load. Weather conditions were terrible. A storm blew in creating very difficlut shooting conditions. We had wind gust ranging 20-30 mph. So for I like this powder. The rifle I was shooting is a factory Savage 10 T with a Sightorn SIII 8 x 32 scope.

    4/12/2015-175 Gr.Nosler Comeptition
    41 Grains IMR 4166-CCI BR 2 Primer-Norma Case
    Seating Depth 2.800"
    Series1 Shots:5 Min 2539 Max 2561
    Avg 2553
    S-D 8
    ES 22
    100 Yard Group: 5 Shots .586 Edge to Edge.
    200 Yard Group: 5 shot 1.287 Edge to Edge.