Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | SUS-TAC HPT 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% | 54,984 psi | 86% | 3015 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,637 psi | 89% | 3179 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 86% | 57,725 psi | 90% | 3186 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 84% | 55,956 psi | 88% | 3104 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,534 psi | 85% | 3120 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 57,203 psi | 90% | 3159 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 53,809 psi | 84% | 3215 fps | 98.3% |
| ADI AR 2225 | <<locked>> | 98% | 56,289 psi | 88% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,579 psi | 87% | 3094 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,100 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,029 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,363 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,664 psi | 84% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,622 psi | 87% | 3196 fps | 98.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,332 psi | 87% | 3182 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,027 psi | 86% | 3077 fps | 98.4% |
| Bofors RP15 | <<locked>> | 88% | 54,491 psi | 85% | 3107 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,159 psi | 90% | 3173 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,100 psi | 86% | 3117 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,752 psi | 86% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,305 psi | 90% | 3110 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,246 psi | 88% | 3094 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,188 psi | 88% | 3005 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,652 psi | 89% | 3248 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,855 psi | 59% | 1991 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,537 psi | 90% | 3087 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 56,768 psi | 89% | 3166 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,390 psi | 87% | 3159 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,681 psi | 89% | 3041 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,695 psi | 89% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,027 psi | 86% | 3127 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,128 psi | 85% | 3127 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 56,724 psi | 89% | 3114 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 61% | 2041 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,609 psi | 90% | 3235 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,811 psi | 89% | 3199 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 84% | 56,376 psi | 88% | 3071 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 55,347 psi | 87% | 3084 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,969 psi | 86% | 3081 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,099 psi | 85% | 3002 fps | 99.4% |
| Somchem S385 | <<locked>> | 84% | 55,738 psi | 87% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,637 psi | 87% | 3038 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,926 psi | 86% | 3061 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 84% | 55,071 psi | 86% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,462 psi | 85% | 3133 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 55,579 psi | 87% | 3127 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 94% | 57,363 psi | 90% | 3202 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 94% | 54,563 psi | 86% | 3199 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,421 psi | 90% | 3169 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,492 psi | 87% | 3048 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,918 psi | 70% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,298 psi | 77% | 3048 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 80% | 46,673 psi | 73% | 2986 fps | 98% |
| ADI AR 2209 | <<locked>> | 80% | 48,936 psi | 77% | 2982 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 44,150 psi | 69% | 2923 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 32,895 psi | 52% | 2648 fps | 95% |
| ADI AR 2218 | <<locked>> | 92% | 43,047 psi | 67% | 2979 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 30,240 psi | 47% | 2615 fps | 97.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,834 psi | 77% | 2976 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,933 psi | 70% | 2930 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,729 psi | 69% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,927 psi | 59% | 2802 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,864 psi | 78% | 3041 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,266 psi | 69% | 2976 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,164 psi | 69% | 2963 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,496 psi | 67% | 2831 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 41,785 psi | 65% | 2861 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 35,447 psi | 56% | 2730 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 44,933 psi | 70% | 2930 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 35,810 psi | 56% | 2730 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 46,731 psi | 73% | 2923 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,890 psi | 72% | 2904 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,649 psi | 83% | 2953 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,985 psi | 58% | 2848 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 45% | 1785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,514 psi | 74% | 2910 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 42,888 psi | 67% | 2904 fps | 98.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,214 psi | 54% | 2720 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 38,754 psi | 61% | 2717 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 30,052 psi | 47% | 2618 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 47,819 psi | 75% | 3002 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,236 psi | 68% | 2923 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 80% | 38,972 psi | 61% | 2789 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 46% | 1824 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,448 psi | 57% | 2822 fps | 99.2% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,914 psi | 61% | 2844 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 49,501 psi | 78% | 2953 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 48,443 psi | 76% | 2966 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,095 psi | 75% | 2959 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 50,589 psi | 79% | 2940 fps | 99% |
| Somchem S385 | <<locked>> | 80% | 48,834 psi | 77% | 2936 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,801 psi | 67% | 2808 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 48,022 psi | 75% | 2936 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 48,428 psi | 76% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,384 psi | 74% | 3002 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 39,523 psi | 62% | 2808 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 40,001 psi | 63% | 2861 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 88% | 44,019 psi | 69% | 2989 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,424 psi | 66% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,034 psi | 71% | 2864 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 | 180gr | SUS-TAC HPT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,248 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 1:9.5 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.