Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 175gr | Sierra Tipped MatchKing bullet and 50 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% | 55,434 psi | 87% | 3058 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,435 psi | 90% | 3228 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 54,433 psi | 85% | 3169 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 56,492 psi | 89% | 3153 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,129 psi | 86% | 3166 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 54,085 psi | 85% | 3143 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,491 psi | 85% | 3261 fps | 98.3% |
| ADI AR 2225 | <<locked>> | 98% | 57,217 psi | 90% | 3228 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,057 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,666 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,479 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,201 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,288 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,405 psi | 88% | 3245 fps | 98.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 3232 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,593 psi | 87% | 3127 fps | 98.4% |
| Bofors RP15 | <<locked>> | 88% | 55,056 psi | 86% | 3153 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,128 psi | 85% | 3159 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,666 psi | 87% | 3163 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,477 psi | 87% | 3166 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 53,983 psi | 85% | 3094 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,797 psi | 89% | 3140 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,753 psi | 89% | 3051 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,508 psi | 90% | 3297 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,433 psi | 85% | 3074 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 57,464 psi | 90% | 3212 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,086 psi | 88% | 3209 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,261 psi | 90% | 3087 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3228 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,767 psi | 87% | 3179 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,839 psi | 86% | 3176 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 57,392 psi | 90% | 3159 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,754 psi | 61% | 2073 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,201 psi | 85% | 3215 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,592 psi | 84% | 3179 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 56,913 psi | 89% | 3120 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 55,898 psi | 88% | 3133 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,521 psi | 87% | 3130 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,549 psi | 85% | 3048 fps | 99.4% |
| Somchem S385 | <<locked>> | 84% | 56,173 psi | 88% | 3097 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,173 psi | 88% | 3084 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,593 psi | 87% | 3107 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 84% | 55,666 psi | 87% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,158 psi | 86% | 3182 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 56,289 psi | 88% | 3176 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 54,085 psi | 85% | 3182 fps | 99% |
| Vihtavuori N570 | <<locked>> | 94% | 55,463 psi | 87% | 3248 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,940 psi | 85% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,028 psi | 88% | 3097 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,281 psi | 71% | 2887 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,850 psi | 78% | 3094 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 80% | 47,282 psi | 74% | 3031 fps | 98% |
| ADI AR 2209 | <<locked>> | 80% | 49,400 psi | 77% | 3028 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 44,585 psi | 70% | 2969 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 33,286 psi | 52% | 2690 fps | 95% |
| ADI AR 2218 | <<locked>> | 92% | 43,685 psi | 68% | 3028 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 30,589 psi | 48% | 2654 fps | 97% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,139 psi | 77% | 3018 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,368 psi | 71% | 2972 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,106 psi | 69% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,377 psi | 60% | 2844 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,372 psi | 79% | 3087 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,034 psi | 71% | 3022 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,991 psi | 71% | 3009 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,815 psi | 67% | 2874 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 42,264 psi | 66% | 2907 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 35,766 psi | 56% | 2769 fps | 96.2% |
| Bofors RP5 | <<locked>> | 80% | 45,368 psi | 71% | 2972 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 36,172 psi | 57% | 2772 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 47,108 psi | 74% | 2966 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,282 psi | 73% | 2949 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,098 psi | 83% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,405 psi | 59% | 2890 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,950 psi | 75% | 2953 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 80% | 43,337 psi | 68% | 2949 fps | 98.1% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,650 psi | 54% | 2759 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 39,044 psi | 61% | 2759 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 30,472 psi | 48% | 2657 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 48,327 psi | 76% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,642 psi | 68% | 2963 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 80% | 39,450 psi | 62% | 2831 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1860 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,840 psi | 58% | 2864 fps | 99.2% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,450 psi | 62% | 2887 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 49,995 psi | 78% | 2999 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 48,936 psi | 77% | 3009 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,588 psi | 76% | 3005 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 51,126 psi | 80% | 2986 fps | 99% |
| Somchem S385 | <<locked>> | 80% | 49,240 psi | 77% | 2979 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,091 psi | 68% | 2848 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 48,457 psi | 76% | 2976 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 48,820 psi | 77% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,877 psi | 75% | 3045 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 80% | 40,001 psi | 63% | 2851 fps | 96.9% |
| Vihtavuori N568 | <<locked>> | 84% | 40,596 psi | 64% | 2907 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 88% | 44,541 psi | 70% | 3031 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,960 psi | 67% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,542 psi | 71% | 2910 fps | 99.3% |
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 | 175gr | Sierra Tipped MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,297 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,297 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 175.0 gr projectile in 0.308" calls for a 1:12.0 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, Hodgdon US 869, Lovex D100, Ramshot LRT 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.