The latest IMR Legendary Powder, IMR 8133, is an Enduron Technology
powder. It was designed to provide optimum performance in the large overbored cartridges
like the 300 Remington Ultra Magnum, 6.5mm-300 Weatherby Magnum, 28 Nosler and a
host of other fine magnum cartridges. It provides excellent loading density, copper fouling
eliminator, insensitivity to extreme temperature changes and is environmentally friendly. It is,
without equal, the consummate big game cartridge propellant.
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.
IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data.
Available in 1-LB and 8-LB containers.
Experience on IMR 8133
I tried it in my 30-338 rum imp. I lost 30-40 fps. compared to rl-33 and it is a little bulkier than rl-33 so ran out of room in case. it dose burn a lot cleaner than 33 and the copper fouling was reduced just like the IMR7977 that I used in my 300 win mag.
in my 6.5-300 win mag I had no problem getting 26 nosler velocities but never could find an accurate load and gave up in that gun.