Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Sellier & Bellot HPBT bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 54,969 psi | 86% | 3107 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 53,853 psi | 84% | 3212 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 55,956 psi | 88% | 3199 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,476 psi | 85% | 3209 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 57,334 psi | 90% | 3251 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 53,940 psi | 85% | 3301 fps | 97.9% |
| ADI AR 2225 | <<locked>> | 98% | 56,550 psi | 89% | 3274 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,115 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,550 psi | 87% | 3186 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,998 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,985 psi | 89% | 3166 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,450 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,679 psi | 84% | 3196 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,782 psi | 87% | 3281 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3268 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,158 psi | 86% | 3166 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 54,549 psi | 85% | 3199 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,261 psi | 90% | 3264 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,998 psi | 86% | 3205 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,897 psi | 86% | 3209 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,348 psi | 90% | 3202 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,159 psi | 88% | 3182 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,188 psi | 88% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,652 psi | 89% | 3340 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 59% | 2073 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,406 psi | 90% | 3176 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 56,869 psi | 89% | 3258 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3248 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 56,782 psi | 89% | 3133 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3271 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,056 psi | 86% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,172 psi | 85% | 3215 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 56,869 psi | 89% | 3202 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 61% | 2119 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,563 psi | 84% | 3258 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,174 psi | 90% | 3291 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 56,449 psi | 88% | 3166 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,361 psi | 87% | 3179 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,984 psi | 86% | 3173 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,143 psi | 85% | 3091 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 55,608 psi | 87% | 3143 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,622 psi | 87% | 3127 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,984 psi | 86% | 3146 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 54,984 psi | 86% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,476 psi | 85% | 3222 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 55,767 psi | 87% | 3219 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 57,566 psi | 90% | 3294 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 54,853 psi | 86% | 3287 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,493 psi | 90% | 3264 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,477 psi | 87% | 3136 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,889 psi | 70% | 2930 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 46,688 psi | 73% | 3071 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 48,907 psi | 77% | 3071 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 44,164 psi | 69% | 3009 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 35,186 psi | 55% | 2785 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 46,485 psi | 73% | 3136 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 30,269 psi | 47% | 2684 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,226 psi | 77% | 3068 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,762 psi | 76% | 3061 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,933 psi | 70% | 3015 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,627 psi | 68% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,898 psi | 59% | 2881 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,821 psi | 78% | 3130 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,512 psi | 70% | 3054 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,892 psi | 75% | 3114 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,281 psi | 71% | 2972 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 41,771 psi | 65% | 2943 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 35,389 psi | 55% | 2802 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 44,933 psi | 70% | 3015 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 35,795 psi | 56% | 2805 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 46,717 psi | 73% | 3009 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,890 psi | 72% | 2989 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,634 psi | 82% | 3045 fps | 100% |
| Hodgdon Retumbo | 91.2 gr | 80% | 36,999 psi | 58% | 2923 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 45% | 1860 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,485 psi | 74% | 2995 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 42,917 psi | 67% | 2989 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,287 psi | 54% | 2792 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 38,580 psi | 60% | 2795 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 29,979 psi | 47% | 2684 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 47,790 psi | 75% | 3091 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,105 psi | 68% | 3002 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 38,928 psi | 61% | 2867 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 46% | 1900 fps | 100% |
| ReloadSwiss RS 76 | 97.6 gr | 80% | 36,448 psi | 57% | 2897 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,972 psi | 61% | 2917 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 49,530 psi | 78% | 3041 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 48,428 psi | 76% | 3051 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,080 psi | 75% | 3048 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,633 psi | 79% | 3028 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 48,863 psi | 77% | 3025 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,728 psi | 67% | 2890 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,358 psi | 80% | 3077 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,312 psi | 76% | 3028 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,369 psi | 74% | 3084 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,450 psi | 62% | 2884 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 40,103 psi | 63% | 2940 fps | 95.2% |
| Vihtavuori N570 | 106.4 gr | 90% | 47,297 psi | 74% | 3140 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,308 psi | 66% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,005 psi | 71% | 2949 fps | 99% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 50 powders for .30-378 Weath. Mag. loaded with the .308 | 168gr | Sellier & Bellot HPBT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,340 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,340 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 50 of the 50 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 168.0 gr projectile in 0.308" calls for a 1:12.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 168gr | Sellier & Bellot HPBT they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.