Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Barnes MRX BT 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% | 54,940 psi | 86% | 3018 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,072 psi | 89% | 3189 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 54,070 psi | 85% | 3130 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 56,246 psi | 88% | 3114 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,940 psi | 86% | 3130 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 53,911 psi | 84% | 3107 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,389 psi | 85% | 3228 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 57,116 psi | 90% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,825 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,332 psi | 87% | 3123 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,305 psi | 90% | 3081 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,157 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,027 psi | 85% | 3110 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,188 psi | 88% | 3205 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3192 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,506 psi | 87% | 3091 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 54,723 psi | 86% | 3114 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,711 psi | 90% | 3186 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,332 psi | 87% | 3123 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,347 psi | 87% | 3130 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,595 psi | 90% | 3120 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,579 psi | 89% | 3104 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,536 psi | 89% | 3012 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,406 psi | 90% | 3258 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 2001 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,186 psi | 85% | 3038 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 57,290 psi | 90% | 3176 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3169 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,811 psi | 89% | 3048 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3192 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,448 psi | 87% | 3136 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,607 psi | 86% | 3136 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 57,087 psi | 89% | 3120 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,667 psi | 61% | 2047 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,012 psi | 85% | 3176 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,493 psi | 90% | 3212 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 56,652 psi | 89% | 3081 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 55,550 psi | 87% | 3094 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,187 psi | 86% | 3087 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,418 psi | 85% | 3012 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 55,927 psi | 88% | 3061 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,014 psi | 88% | 3048 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,216 psi | 87% | 3074 fps | 97% |
| Vihtavuori N555 | <<locked>> | 84% | 55,143 psi | 86% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,868 psi | 86% | 3143 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 55,825 psi | 87% | 3136 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 53,751 psi | 84% | 3143 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 55,187 psi | 86% | 3212 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,853 psi | 84% | 3117 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,695 psi | 87% | 3058 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,614 psi | 70% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,545 psi | 78% | 3054 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 46,833 psi | 73% | 2992 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 49,110 psi | 77% | 2989 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,382 psi | 70% | 2933 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 32,764 psi | 51% | 2648 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 92% | 43,337 psi | 68% | 2989 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 30,081 psi | 47% | 2612 fps | 97.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,936 psi | 77% | 2982 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,034 psi | 71% | 2936 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,743 psi | 69% | 2864 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,913 psi | 59% | 2802 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,038 psi | 78% | 3048 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,643 psi | 70% | 2982 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,353 psi | 70% | 2966 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,540 psi | 67% | 2838 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 41,771 psi | 65% | 2864 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 35,273 psi | 55% | 2726 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 45,034 psi | 71% | 2936 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 35,795 psi | 56% | 2733 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 80% | 46,905 psi | 74% | 2933 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,035 psi | 72% | 2913 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,852 psi | 83% | 2959 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,072 psi | 58% | 2851 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1791 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,616 psi | 75% | 2917 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,091 psi | 68% | 2913 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,156 psi | 54% | 2717 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 38,348 psi | 60% | 2713 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 29,747 psi | 47% | 2608 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 48,051 psi | 75% | 3012 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,410 psi | 68% | 2927 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 80% | 38,914 psi | 61% | 2789 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,037 psi | 46% | 1834 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,448 psi | 57% | 2822 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,015 psi | 61% | 2848 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,806 psi | 78% | 2963 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,515 psi | 76% | 2972 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,182 psi | 76% | 2966 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 50,763 psi | 80% | 2953 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 48,892 psi | 77% | 2943 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,743 psi | 67% | 2815 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 47,964 psi | 75% | 2940 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 48,341 psi | 76% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,659 psi | 75% | 3009 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 39,363 psi | 62% | 2808 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 40,103 psi | 63% | 2864 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 88% | 44,135 psi | 69% | 2989 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,598 psi | 67% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,107 psi | 71% | 2871 fps | 99.4% |
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 | 180gr | Barnes MRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,258 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 180.0 gr projectile in 0.308" calls for a 1:11.5 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.