Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 167gr | Lapua Scenar bullet and 51 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% | 54,868 psi | 86% | 3114 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,579 psi | 89% | 3274 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 86% | 57,682 psi | 90% | 3284 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 55,840 psi | 88% | 3202 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,331 psi | 85% | 3215 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 57,188 psi | 90% | 3255 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 53,751 psi | 84% | 3304 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 98% | 56,376 psi | 88% | 3278 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,043 psi | 88% | 3199 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,463 psi | 87% | 3192 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,911 psi | 86% | 3212 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,898 psi | 89% | 3176 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,319 psi | 90% | 3251 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,638 psi | 90% | 3264 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,738 psi | 87% | 3284 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3271 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,056 psi | 86% | 3173 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 54,302 psi | 85% | 3199 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,116 psi | 90% | 3268 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,911 psi | 86% | 3212 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,766 psi | 86% | 3215 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,261 psi | 90% | 3209 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,072 psi | 88% | 3189 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,086 psi | 88% | 3104 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,492 psi | 89% | 3346 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 59% | 2080 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,319 psi | 90% | 3182 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 56,753 psi | 89% | 3261 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,332 psi | 87% | 3251 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,681 psi | 89% | 3140 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3278 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,955 psi | 86% | 3228 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,056 psi | 85% | 3222 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 56,724 psi | 89% | 3209 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 2126 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,653 psi | 90% | 3330 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,985 psi | 89% | 3294 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 56,202 psi | 88% | 3166 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,274 psi | 87% | 3186 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,897 psi | 86% | 3179 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,041 psi | 85% | 3097 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 55,535 psi | 87% | 3150 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,535 psi | 87% | 3133 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,868 psi | 86% | 3153 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 54,926 psi | 86% | 3150 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,389 psi | 85% | 3228 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,651 psi | 87% | 3225 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 57,392 psi | 90% | 3297 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 54,679 psi | 86% | 3291 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,363 psi | 90% | 3271 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,405 psi | 87% | 3146 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% | 44,657 psi | 70% | 2930 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 49,211 psi | 77% | 3140 fps | 99% |
| Accurate MAGPRO | <<locked>> | 80% | 46,615 psi | 73% | 3074 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 48,675 psi | 76% | 3074 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 43,947 psi | 69% | 3012 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 35,143 psi | 55% | 2789 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 46,398 psi | 73% | 3143 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 30,124 psi | 47% | 2684 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,023 psi | 77% | 3071 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,559 psi | 76% | 3064 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,744 psi | 70% | 3015 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,540 psi | 68% | 2949 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,681 psi | 59% | 2881 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,734 psi | 78% | 3136 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,805 psi | 75% | 3133 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,703 psi | 75% | 3120 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,208 psi | 71% | 2976 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,727 psi | 65% | 2946 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 35,201 psi | 55% | 2805 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 44,744 psi | 70% | 3015 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,636 psi | 56% | 2805 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 46,528 psi | 73% | 3012 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,687 psi | 72% | 2995 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,562 psi | 82% | 3054 fps | 100% |
| Hodgdon Retumbo | 91.3 gr | 80% | 36,825 psi | 58% | 2923 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,311 psi | 74% | 2999 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,699 psi | 67% | 2989 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,651 psi | 57% | 2861 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 38,522 psi | 60% | 2799 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 29,907 psi | 47% | 2687 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 47,718 psi | 75% | 3094 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,018 psi | 67% | 3009 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 38,856 psi | 61% | 2871 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 46% | 1906 fps | 100% |
| ReloadSwiss RS 76 | 97.8 gr | 80% | 36,332 psi | 57% | 2900 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,870 psi | 61% | 2923 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,458 psi | 78% | 3048 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 48,356 psi | 76% | 3058 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,022 psi | 75% | 3054 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,575 psi | 79% | 3031 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 48,675 psi | 76% | 3028 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,554 psi | 67% | 2894 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,213 psi | 80% | 3084 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,240 psi | 76% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,297 psi | 74% | 3091 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,392 psi | 62% | 2887 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 39,885 psi | 63% | 2940 fps | 95% |
| Vihtavuori N570 | 106.6 gr | 90% | 47,166 psi | 74% | 3143 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,192 psi | 66% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,933 psi | 70% | 2953 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 51 powders for .30-378 Weath. Mag. loaded with the .308 | 167gr | Lapua Scenar. Hodgdon Retumbo delivers the highest muzzle velocity at 3,346 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,346 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 167.0 gr projectile in 0.308" calls for a 1:13.0 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 | 167gr | Lapua Scenar 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.