IMR Enduron® 4451
$49.99 - $357.99
IMR Enduron® 4451
IMR Enduron® 4451
IMR Enduron® 4451
IMR Enduron® 4451
IMR Enduron® 4451

IMR Enduron 4451 is a versatile, match-grade propellant with a mid-range burn speed in the Enduron line. It is an extruded powder and is perfect for cartridges like 270 Winchester, 30-06 or 300 Winchester Short Magnum, among others.

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

This propellant performs comparably to Hodgdon H4350 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

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

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Reviews and Ratings

Mike Sonderman
Most Accurate Powder with 123 -grain bullets in .260 Rem

Tried several powders while developing loads for a Remington 700 5R Milspec in .260 Remington. IMR-4451 gave the best accuracy, even over the vaunted H-4350, using 123-grain bullets. Happy with results!


This powder works great, vary reliable and consistent. This powder performs like a higher end powder. This will be my new go to powder for 6.5 creedmoor.


I loaded 200 cartridges in 6.5 Creedmoor using Lapua brass with small primers and 135 grain A-tip bullets. I used these at a 1000 yard training class and the powder performed excellently. The first morning was below freezing and the second day was 45 degrees. No change in trajectory from one day to the next, and I was getting 2775 fps with a 42.8 grain load which was mildly compressed in my once fired brass. I noticed excellent consistency with this powder and consider it as good as H4350.

IMR 4451 30-06 loads

This has become my go to when I can't find any 4895. Shoots super clean with good velocities. I use 54grs with the 168gr HPBT and 55grs with 150gr HPBT. Highly recommend if you usually load 4895 and can't find any.

4451,My rifle loves it.

I have played with a lot of powders and IMR 4451 keeps turning up as one of the best. My 6.5 CM just loves 41.3 grains under a 143gr ELD-X bullet. Set at 2.820 Coal. Great deer load and all the holes touch at the range. Tends to shoot best just a little under max.

very pleased

This seems to be a consistent and clean burning powder suitable for my 6.5 Creedmoor. Velocities are not the fastest available but here you dont have much soot and it meters well.

Imr 4451

Simply amazing!! Works well in many calibers! I am shooting almost hole for hole with 25 06 and 280, definitely my new go to powder

William Belcher
Accurate powder

Had difficult time getting a new Christiansen Arms Ridgeline to group. Was using STaBall with mixed results, mostly bad. Tried H4350, better, but not great. Had 2 cans of 4451,started at 46 grains, working up to 47.2 when I hit a very good node. 5 shots inside. .5 inches, best 3 shot group was .343, 5 shots at .567 inch. 139 SST, Lapua brass, federal LR match primers. Very pleased now.

IMR 4451

Great powder for 280AI.
143 grain Hammer Hunters, 55 and 55.5 IMR4451 produce consistent sub 1/2" 5 shot groups at 100 yards.

Love this powder

I use this powder for my 6.5 creedmoor shooting 123gr ELD. I tried what the book said but I wasn’t satisfied so I looked at burn rates and figured I’d try IMR4451 and at 70 yards I was shooting a nickel size group. 43.9gr worked great