Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 184gr | SUS-TAC HP bullet and 53 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% | 56,101 psi | 88% | 3002 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 47,108 psi | 74% | 2953 fps | 96.2% |
| Accurate High Country | <<locked>> | 82% | 54,143 psi | 85% | 3107 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 55,143 psi | 86% | 3117 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 84% | 57,043 psi | 89% | 3094 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,709 psi | 87% | 3110 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 54,824 psi | 86% | 3094 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,187 psi | 86% | 3215 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 53,940 psi | 85% | 3114 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,637 psi | 89% | 3081 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,217 psi | 88% | 3104 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,621 psi | 86% | 3012 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,955 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,984 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,130 psi | 90% | 3192 fps | 98.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3182 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,144 psi | 88% | 3071 fps | 98.7% |
| Bofors RP15 | <<locked>> | 88% | 55,651 psi | 87% | 3094 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,781 psi | 86% | 3104 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,217 psi | 88% | 3104 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,231 psi | 88% | 3114 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,607 psi | 86% | 3041 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,348 psi | 90% | 3084 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,290 psi | 90% | 2989 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,302 psi | 85% | 3179 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 59% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,911 psi | 86% | 3015 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 54,273 psi | 85% | 3094 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 92% | 57,072 psi | 89% | 3018 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3153 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,418 psi | 85% | 2979 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,346 psi | 85% | 3117 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,434 psi | 88% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,434 psi | 87% | 3117 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 53,998 psi | 85% | 3041 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 61% | 2021 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,998 psi | 86% | 3163 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,273 psi | 85% | 3127 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 84% | 57,406 psi | 90% | 3058 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,449 psi | 88% | 3074 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,313 psi | 77% | 2972 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,115 psi | 88% | 3068 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,071 psi | 86% | 2992 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,782 psi | 89% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,913 psi | 89% | 3028 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,173 psi | 88% | 3054 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 84% | 56,246 psi | 88% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,782 psi | 87% | 3127 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 56,956 psi | 89% | 3123 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 54,766 psi | 86% | 3130 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 56,086 psi | 88% | 3199 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,795 psi | 86% | 3100 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,594 psi | 89% | 3038 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,919 psi | 72% | 2835 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 43,859 psi | 69% | 2887 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 50,401 psi | 79% | 3041 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 80% | 47,747 psi | 75% | 2979 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 80% | 49,951 psi | 78% | 2972 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 45,165 psi | 71% | 2920 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 80% | 33,678 psi | 53% | 2648 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 92% | 44,150 psi | 69% | 2982 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 31,009 psi | 49% | 2615 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,821 psi | 78% | 2966 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,934 psi | 72% | 2920 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,730 psi | 70% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,914 psi | 61% | 2795 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,126 psi | 80% | 3031 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 42,351 psi | 66% | 2907 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,513 psi | 71% | 2966 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,221 psi | 68% | 2825 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,757 psi | 67% | 2854 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 36,390 psi | 57% | 2730 fps | 97% |
| Bofors RP5 | <<locked>> | 80% | 45,934 psi | 72% | 2920 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 36,651 psi | 57% | 2726 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,688 psi | 75% | 2913 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,833 psi | 73% | 2897 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,722 psi | 84% | 2940 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,956 psi | 59% | 2848 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,385 psi | 76% | 2900 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 43,918 psi | 69% | 2900 fps | 98.6% |
| IMR 7977 Enduron | <<locked>> | 90% | 53,621 psi | 84% | 2959 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 84% | 32,837 psi | 51% | 2654 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 39,508 psi | 62% | 2707 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 28,790 psi | 45% | 2552 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 48,921 psi | 77% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,367 psi | 70% | 2917 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 40,016 psi | 63% | 2785 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,449 psi | 59% | 2825 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,115 psi | 58% | 2772 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 50,444 psi | 79% | 2943 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 49,458 psi | 78% | 2956 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 45,876 psi | 72% | 2904 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,110 psi | 77% | 2949 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,532 psi | 81% | 2930 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 49,806 psi | 78% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,714 psi | 69% | 2802 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 48,979 psi | 77% | 2927 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 49,516 psi | 78% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,457 psi | 76% | 2995 fps | 99% |
| Vihtavuori N565 | <<locked>> | 80% | 40,466 psi | 63% | 2805 fps | 97.5% |
| Vihtavuori N568 | <<locked>> | 82% | 38,261 psi | 60% | 2795 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 88% | 45,194 psi | 71% | 2989 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,714 psi | 69% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,977 psi | 72% | 2858 fps | 99.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 184gr | SUS-TAC HP. ADI AR 2218 delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,215 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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 184.0 gr projectile in 0.308" calls for a 1:10.5 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.