Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 178gr | Hornady BTHP Match 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% | 56,202 psi | 88% | 3051 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,215 psi | 85% | 3153 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 55,245 psi | 87% | 3159 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 57,188 psi | 90% | 3140 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,927 psi | 88% | 3159 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 54,955 psi | 86% | 3136 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,434 psi | 87% | 3261 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 54,128 psi | 85% | 3159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,782 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,434 psi | 88% | 3153 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,563 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,056 psi | 86% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,172 psi | 86% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,377 psi | 90% | 3238 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3228 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,260 psi | 88% | 3114 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 55,825 psi | 87% | 3143 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,984 psi | 86% | 3150 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 56,434 psi | 88% | 3153 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,376 psi | 88% | 3156 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,679 psi | 86% | 3084 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,537 psi | 90% | 3133 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,435 psi | 90% | 3038 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,360 psi | 85% | 3222 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2011 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,071 psi | 86% | 3064 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 54,331 psi | 85% | 3140 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,014 psi | 89% | 3202 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,520 psi | 85% | 3025 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,534 psi | 85% | 3163 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,594 psi | 89% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,564 psi | 87% | 3163 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,143 psi | 85% | 3087 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,899 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,201 psi | 87% | 3209 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,520 psi | 85% | 3176 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 57,609 psi | 90% | 3107 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,652 psi | 89% | 3123 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,429 psi | 77% | 3012 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,275 psi | 88% | 3120 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,216 psi | 87% | 3035 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,898 psi | 89% | 3087 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,855 psi | 89% | 3074 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,347 psi | 88% | 3104 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 84% | 56,449 psi | 88% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,956 psi | 88% | 3173 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 57,116 psi | 90% | 3166 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 54,969 psi | 86% | 3176 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 56,405 psi | 88% | 3245 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,969 psi | 86% | 3146 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,724 psi | 89% | 3084 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,905 psi | 72% | 2877 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 50,575 psi | 79% | 3087 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 47,848 psi | 75% | 3022 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 49,922 psi | 78% | 3015 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 45,266 psi | 71% | 2963 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 33,779 psi | 53% | 2684 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 92% | 44,382 psi | 70% | 3025 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 31,096 psi | 49% | 2654 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,792 psi | 78% | 3009 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,035 psi | 72% | 2966 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,802 psi | 70% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,899 psi | 61% | 2835 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,184 psi | 80% | 3077 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 42,525 psi | 67% | 2946 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,832 psi | 72% | 3009 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,323 psi | 68% | 2864 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 42,902 psi | 67% | 2900 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 36,376 psi | 57% | 2766 fps | 96.7% |
| Bofors RP5 | <<locked>> | 80% | 46,035 psi | 72% | 2966 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,724 psi | 58% | 2766 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 47,761 psi | 75% | 2959 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,876 psi | 73% | 2943 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,795 psi | 84% | 2986 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 38,058 psi | 60% | 2887 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1801 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,385 psi | 76% | 2943 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 44,019 psi | 69% | 2943 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 84% | 32,996 psi | 52% | 2694 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 39,653 psi | 62% | 2753 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 28,921 psi | 45% | 2589 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 49,081 psi | 77% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,411 psi | 70% | 2959 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 40,103 psi | 63% | 2825 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,182 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,507 psi | 59% | 2861 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,217 psi | 58% | 2812 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 50,618 psi | 79% | 2989 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 49,617 psi | 78% | 3002 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,195 psi | 72% | 2949 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,269 psi | 77% | 2999 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,605 psi | 81% | 2976 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 49,908 psi | 78% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,685 psi | 68% | 2841 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 49,139 psi | 77% | 2972 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 49,530 psi | 78% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,602 psi | 76% | 3038 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 40,640 psi | 64% | 2848 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 82% | 38,319 psi | 60% | 2831 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 88% | 45,339 psi | 71% | 3028 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,772 psi | 69% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,180 psi | 72% | 2900 fps | 99.5% |
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 | 178gr | Hornady BTHP Match. ADI AR 2218 delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,261 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 178.0 gr projectile in 0.308" calls for a 1:11.5 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.