Coming Soon: New IMR 4955 Enduron Powder

IMR just announced its latest Enduron powder, IMR 4955, which features a medium-slow burn rate similar to Hodgdon H4831 or IMR 4831. The IMR Enduron powders are clean-burning, temp stable, and feature a proprietary coating that helps reduce copper fouling. We are looking forward to trying IMR 4955 based on our positive experience with IMR 4166. We have used Enduron 4166 and have seen excellent accuracy in .308 Winchester and 6mm BR rifles.

IMR 4955 lands between IMR 4451 and IMR 7977 on the burn rate chart. Hodgdon, which distributes IMR powders, says that IMR 4955 works very well for cartridges such as 25-06 Remington, .270 Winchester, and the .300 Winchester Magnum. Perhaps this will prove a good choice for the .284 Win and .300 WSM as well (F-Open shooters take note). If you are currently using H4831 or H4831sc you should probably give IMR 4955 a try.

Hodgdon says IMR 4955 offers some important advantages:

1. IMR 4955 has a small kernel size. This allows the powder to flow through powder measures easily and meter very accurately.
3. IMR 4955 is very insensitive to temperature changes, so shooters should see uniform velocities across a broad temp range.
3. IMR 4955 has very good load density for medium and big game hunting cartridges (such as the .270 Win and .300 Win Mag).
4. Like other Enduron powders, IMR 4955 boasts a special additive that helps reduce copper fouling as the rifle is fired.

IMR 4955 Should Be Available Early Next Year
— Load Data is Online Now
IMR 4955 will be available in early 2016 in one-pound and eight-pound containers. With the addition of IMR 4955 to the series of Enduron powders, reloaders have a new, advanced-formulation powder that should work for a wide variety of popular cartridges — from the .260 Rem up to big magnums. Reloading data for IMR 4955 is now available online in the Hodgdon Reloading Data Center. Below is a sample of Hodgdon/IMR load data for IMR 4955 as used in the .300 Win Mag cartridge.