Buy IMR 4955 Smokeless Powder IMR 4955 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 the big games. As with all Enduron powder, it is temperature insensitive, clean-burning, minimizes copper fouling and is totally safe for the environment. Adding this propellant to the Enduron powder line filled in an important place in the chart. IMR Reloading Smokeless Powder, plus the original three, provides top-loading for cartridges from 223 Remington to the massive 500 Nitro Express Magnum.
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