This new Enduron extruded powder is a top PERFORMER with such great
cartridges as the 270 Winchester, 25-06 Remington, 280 Remington and 300 Winchester
Magnum, and many, many more. It falls directly between IMR 4451 and IMR 7977 in burn
speed, providing top performance for all cartridges used for big game. As with all Enduron
powders, it is temperature insensitive, clean burning, minimizes coper fouling and is totally
safe for the environment. Adding this propellant to the Enduron line filled in an important place
in the chart. IMR 4955, plus the original three, provides top loading for cartidges from 223
Remington to the massive 500 Nitro Express Magnum.