Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 175gr | Nosler RDF bullet and 51 powders. The key underlying parameters are shown in the table above.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 55,767 psi | 87% | 3064 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 53,766 psi | 84% | 3166 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 84% | 54,766 psi | 86% | 3176 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 56,782 psi | 89% | 3156 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,448 psi | 87% | 3173 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 54,404 psi | 85% | 3150 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,897 psi | 86% | 3271 fps | 98.4% |
| ADI AR 2225 | <<locked>> | 98% | 57,508 psi | 90% | 3235 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,985 psi | 89% | 3153 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,391 psi | 88% | 3146 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,999 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,143 psi | 85% | 3071 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,578 psi | 86% | 3146 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,636 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,855 psi | 89% | 3251 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3238 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,825 psi | 87% | 3130 fps | 98.4% |
| Bofors RP15 | <<locked>> | 88% | 55,376 psi | 87% | 3159 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,418 psi | 85% | 3163 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,999 psi | 88% | 3169 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,825 psi | 87% | 3169 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,273 psi | 85% | 3100 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,101 psi | 89% | 3146 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,927 psi | 89% | 3054 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 53,766 psi | 84% | 3235 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 59% | 2031 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,694 psi | 86% | 3077 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 86% | 53,853 psi | 84% | 3153 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,420 psi | 88% | 3212 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,580 psi | 90% | 3094 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,099 psi | 85% | 3176 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,101 psi | 88% | 3182 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,187 psi | 86% | 3179 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 53,621 psi | 84% | 3100 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,783 psi | 61% | 2077 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,723 psi | 86% | 3225 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,012 psi | 85% | 3186 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 57,043 psi | 89% | 3123 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,231 psi | 88% | 3140 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,854 psi | 88% | 3133 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,824 psi | 86% | 3051 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 56,492 psi | 89% | 3104 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,623 psi | 89% | 3091 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,825 psi | 87% | 3114 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 84% | 55,869 psi | 88% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,477 psi | 87% | 3186 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 56,594 psi | 89% | 3179 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 54,549 psi | 85% | 3189 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 55,753 psi | 87% | 3255 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,563 psi | 86% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,318 psi | 88% | 3100 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,556 psi | 71% | 2894 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 50,169 psi | 79% | 3100 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 47,442 psi | 74% | 3035 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 49,588 psi | 78% | 3031 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 44,889 psi | 70% | 2976 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 33,417 psi | 52% | 2690 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 92% | 43,903 psi | 69% | 3031 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,821 psi | 48% | 2661 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,908 psi | 78% | 3031 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,429 psi | 77% | 3022 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,658 psi | 72% | 2979 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,440 psi | 70% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,566 psi | 60% | 2848 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,705 psi | 79% | 3091 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,324 psi | 71% | 3028 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,252 psi | 71% | 3015 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,047 psi | 67% | 2877 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 42,438 psi | 67% | 2907 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 36,042 psi | 56% | 2776 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 45,658 psi | 72% | 2979 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 36,434 psi | 57% | 2776 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 80% | 47,413 psi | 74% | 2972 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,572 psi | 73% | 2956 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,447 psi | 84% | 3002 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,710 psi | 59% | 2897 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1821 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,109 psi | 75% | 2959 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 43,642 psi | 68% | 2956 fps | 98.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,940 psi | 55% | 2762 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 39,218 psi | 61% | 2762 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 30,618 psi | 48% | 2661 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 48,675 psi | 76% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,005 psi | 69% | 2972 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 80% | 39,726 psi | 62% | 2838 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1860 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,130 psi | 58% | 2871 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,711 psi | 62% | 2890 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,154 psi | 79% | 3002 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 49,139 psi | 77% | 3015 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,805 psi | 76% | 3009 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 51,256 psi | 80% | 2989 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 49,559 psi | 78% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,381 psi | 68% | 2854 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 48,689 psi | 76% | 2979 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,153 psi | 77% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,211 psi | 76% | 3051 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 40,161 psi | 63% | 2854 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 40,872 psi | 64% | 2913 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 88% | 44,860 psi | 70% | 3038 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,294 psi | 68% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,701 psi | 72% | 2913 fps | 99.3% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 51 powders for .30-378 Weath. Mag. loaded with the .308 | 175gr | Nosler RDF. ADI AR 2218 delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 2,031 fps to 3,271 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.