IMR Enduron® 7977
$47.99 - $324.99
IMR Enduron® 7977
IMR Enduron® 7977
IMR Enduron® 7977
IMR Enduron® 7977
IMR Enduron® 7977
IMR Enduron® 7977

IMR Enduron 7977 is a slower 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 300 Winchester Magnum, 7mm Remington Magnum and 338 Lapua, 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 7977 performs comparably to Hodgdon H1000 but charge weights are materially different.

IMR recommends always consulting for the most accurate, up-to-date data.

Available in 1-LB and 8-LB containers.


Warnings for California Residents

Exclamation point centered in a triangle icon.

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

For more information, go to

Reviews and Ratings

338 lapua

Very fast flat shooting powder. Consistent performance . 338 lapua 250 grain BTHP.

marcus john tweddell
IMR 7977 enduron reloading powder

have used this powder in a .270 wsm useing the Hornady 150 grain SSTwith the exact load as HODGDON recomends and found it accurate and takeing large red deer out to 500 meters with ease.


56.0 grns behind a 100gr NBT got me 0.5" at 100 with 3156 f.p.s.

Terry Wolford
IMR 7977

Works great in a 7mm Remington Magnum cartridge out of a Winchester Stainless Model 70 using 136 gn Hammer (sledge hammer) bullets. Really consistently accurate results.