IMR Enduron® 8133

(6 reviews) Write a Review
$49.99 - $357.99

Smokeless Powder

Product Overview

IMR Enduron 8133 is the slowest burn rate in the Enduron family. Loading density is perfect for magnums, contributing to superb uniformity. This is a true magnum propellant yielding outstanding performance in 6.5-300 Weatherby, 264 Win Mag, 28 Nosler and 300 Rem Ultra Mag, among other cartridges. Loading density is perfect for magnums, nicely filling the case at maximum charges, contributing to superb uniformity and accuracy.

The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly.

IMR 8133 performs comparably to Hodgdon Retumbo but charge weights are materially different.

Made in Canada. 

Available in 1-LB and 8-LB containers.

Product Videos


(6 reviews) Write a Review

6 Reviews

  • 5
    Enduron IMR 8133

    Posted by tony d willIiams on Sep 9th 2023

    This was suggested by Holbrooks. I purchased a pound, experimented and found the proper grains for 338LM, 300gn Bergers. It makes repetitive holes at extra long distance. The occasional fliers are my fault, squeezing during the heartbeat stroke. Only problem is it is hard to find. When I receive emails, the stores are sold out, again.

  • 3
    8133 loads in a 28 Nosler

    Posted by Matthew McLearn on Sep 20th 2022

    I started with a load a full grain less than max. It stuck the case and jammed my ejector into the bolt! Obviously way too hot. I tried another load 3 grains under max, still way too much pressure.

  • 3
    30-378 with IMR8133

    Posted by Justin Wise on Nov 30th 2021

    Start at their starting load! Their max load is way too much. I loaded some 212 grain eld-x with 107 grains of IMR8133 and it stuck the bolt in my accumark. I can't even imagine what would happen if you put their suggested max load of 109 grains behind a 220 grain bullet. Hodgdon needs to rethink some of these numbers as I have noticed other calibers with max loads that are way too hot. I noticed their Retumbo load is way to hot as well.

  • 5
    6.5 PRC

    Posted by Bob on Jun 29th 2021

    Finally found a great powder for my 6.5 PRC Browning LR X-bolt. Dialed scope in at 100 yards using 143 ELD-X and 59.0 grains of IMR8133. Results were night and day compared to other powders. 4 shot groups at 100 covered with a dime! 200 yards nickel size groups. Amazing!!!

  • 5
    IMR 8133

    Posted by Doug Herold on Apr 16th 2021

    Been loading my 7Rem Mag with 8133 for the last two years. Have found it to be very accurate and consistent: sub 0.05 moa with es <20. Very happy with this product.

  • 4
    Ballistics for the above caliber is very impressive using IMR 8133 reloading powder!!

    Posted by Harry McManamon Sr on Nov 25th 2020