Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Nosler Partition 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% | 54,694 psi | 86% | 3123 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,550 psi | 89% | 3287 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 86% | 57,580 psi | 90% | 3297 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 55,680 psi | 87% | 3215 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 54,172 psi | 85% | 3228 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 57,087 psi | 89% | 3268 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 53,708 psi | 84% | 3314 fps | 97.7% |
| ADI AR 2225 | <<locked>> | 98% | 56,202 psi | 88% | 3287 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,303 psi | 87% | 3202 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,708 psi | 86% | 3222 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,695 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,203 psi | 90% | 3264 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,522 psi | 90% | 3278 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,564 psi | 87% | 3294 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3281 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,853 psi | 86% | 3182 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 54,273 psi | 85% | 3215 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 56,985 psi | 89% | 3281 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,708 psi | 86% | 3222 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 54,505 psi | 85% | 3222 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 57,043 psi | 89% | 3222 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,898 psi | 88% | 3202 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,985 psi | 88% | 3120 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,347 psi | 88% | 3356 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 59% | 2093 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,725 psi | 90% | 3189 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,174 psi | 90% | 3196 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 56,565 psi | 89% | 3274 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,187 psi | 86% | 3264 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,492 psi | 89% | 3150 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3287 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,882 psi | 86% | 3241 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 53,838 psi | 84% | 3232 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 56,449 psi | 88% | 3219 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 61% | 2139 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,464 psi | 90% | 3340 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,797 psi | 89% | 3304 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 56,057 psi | 88% | 3182 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,114 psi | 86% | 3196 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,737 psi | 86% | 3192 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,566 psi | 90% | 3169 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 55,376 psi | 87% | 3159 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,521 psi | 87% | 3150 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,781 psi | 86% | 3163 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 54,752 psi | 86% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,317 psi | 85% | 3238 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,376 psi | 87% | 3232 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 57,246 psi | 90% | 3307 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 54,534 psi | 85% | 3304 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,087 psi | 89% | 3281 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,230 psi | 87% | 3156 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,556 psi | 70% | 2943 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 49,037 psi | 77% | 3150 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,441 psi | 73% | 3084 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 48,559 psi | 76% | 3087 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 43,830 psi | 69% | 3018 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 35,027 psi | 55% | 2799 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 46,253 psi | 72% | 3150 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 30,052 psi | 47% | 2690 fps | 96% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,457 psi | 76% | 3077 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,614 psi | 70% | 3028 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,308 psi | 68% | 2959 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,594 psi | 59% | 2894 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,516 psi | 78% | 3146 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,645 psi | 75% | 3143 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,543 psi | 75% | 3127 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,078 psi | 71% | 2989 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 41,481 psi | 65% | 2956 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 35,114 psi | 55% | 2815 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 44,614 psi | 70% | 3028 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 35,549 psi | 56% | 2815 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 46,412 psi | 73% | 3022 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,585 psi | 71% | 3002 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,301 psi | 82% | 3064 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,709 psi | 58% | 2933 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1877 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,114 psi | 85% | 3130 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,224 psi | 74% | 3009 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 42,598 psi | 67% | 3002 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,492 psi | 57% | 2867 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 38,450 psi | 60% | 2812 fps | 99.3% |
| Norma 217 | <<locked>> | 84% | 31,966 psi | 50% | 2762 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 47,558 psi | 75% | 3107 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 42,844 psi | 67% | 3015 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 80% | 38,696 psi | 61% | 2877 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1919 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,216 psi | 57% | 2907 fps | 98.6% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,667 psi | 61% | 2930 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 49,226 psi | 77% | 3058 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 48,124 psi | 75% | 3068 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,776 psi | 75% | 3061 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 50,430 psi | 79% | 3045 fps | 98.6% |
| Somchem S385 | <<locked>> | 80% | 48,515 psi | 76% | 3041 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,438 psi | 67% | 2904 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 51,140 psi | 80% | 3094 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 47,993 psi | 75% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,152 psi | 74% | 3100 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 39,247 psi | 62% | 2897 fps | 96.1% |
| Vihtavuori N568 | <<locked>> | 86% | 42,844 psi | 67% | 3022 fps | 96% |
| Vihtavuori N570 | <<locked>> | 90% | 47,036 psi | 74% | 3153 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,018 psi | 66% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,817 psi | 70% | 2966 fps | 98.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Nosler Partition. Hodgdon Retumbo delivers the highest muzzle velocity at 3,356 fps; across all powders the maximum-charge window runs from 2,093 fps to 3,356 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 165.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.