Reloading 7.62X 54R
With IMR 4166 and 4451 Enduron Powder
New Powders - New Loads
IMR Enduron Family of Powder
IMR's three new Enduron powders, IMR 4166, IMR 4451, and IMR 7977, all feature small kernels for easy metering and a built-in copper fouling eliminator. More good news, Enduron powders are not sensitive to temperature changes. Even better yet, its IMR 4166 is nothing less than a versatile, match grade propellant?. So herein below we present load data for two of the three powders in a variety of bullet weights and powder charges.
| Powder | Bullet Weight | Bullet Diameter | COL | Primer | Charge (grains) | Velocity (fps) | Pressure | Charge (grains) | Velocity (fps) |
Pressure CUP |
|---|---|---|---|---|---|---|---|---|---|---|
| IMR 4166 | 125 | .308 | 2.715 | Remington Large Rifle | 48.8 | 2,922 | 38,600 | 52.5 | 3,126 | 46,200 |
| IMR 4166 | 150 | .308 | 2.875 | Remington Large Rifle | 45.1 | 2,708 | 40,900 | 48.6 | 2,881 | 46,500 |
| IMR 4166 | 150 | .308 | 2.875 | Remington Large Rifle | 45.1 | 2,708 | 40,900 | 48.6 | 2,881 | 46,500 |
| 57-N-323S Russian Military |
149 | .311 | 2.975 | 2,717 | ||||||
| IMR 4451 | 200 | .308 | 2.950 | Remington Large Rifle | 47.0 | 2,344 | 43,000 | 50.6C | 2518 | 46,900 |
| IMR 4451 | 220 | .308 | 2.830 | Remington Large Rifle | 45.0 | 2,182 | 38,900 | 48.4 | 2,350 | 45,800 |