Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Sako Hammerhead bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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>> | 84% | 54,578 psi | 86% | 3009 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,951 psi | 78% | 3031 fps | 97% |
| Accurate MAGPRO | <<locked>> | 84% | 57,595 psi | 90% | 3186 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,390 psi | 87% | 3100 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,114 psi | 85% | 3114 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 57,493 psi | 90% | 3163 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,969 psi | 85% | 3219 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 96% | 56,898 psi | 89% | 3182 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,593 psi | 87% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,042 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,694 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,724 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,537 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,595 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,086 psi | 88% | 3199 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,231 psi | 88% | 3192 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,476 psi | 85% | 3071 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 54,288 psi | 85% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,508 psi | 90% | 3176 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,694 psi | 86% | 3107 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,911 psi | 86% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,753 psi | 89% | 3104 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,579 psi | 87% | 3087 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,116 psi | 90% | 3248 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 2014 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,797 psi | 89% | 3081 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,594 psi | 89% | 3163 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,941 psi | 88% | 3166 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,681 psi | 89% | 3041 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,363 psi | 90% | 3189 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,897 psi | 86% | 3127 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,954 psi | 85% | 3120 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,652 psi | 89% | 3110 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,780 psi | 84% | 3163 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,305 psi | 90% | 3202 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,753 psi | 87% | 3068 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,926 psi | 86% | 3081 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,909 psi | 81% | 3045 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,563 psi | 86% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,000 psi | 89% | 3054 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,143 psi | 86% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,332 psi | 87% | 3035 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,607 psi | 86% | 3061 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 54,897 psi | 86% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,259 psi | 85% | 3130 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,608 psi | 87% | 3127 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,566 psi | 90% | 3205 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,984 psi | 86% | 3202 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,679 psi | 84% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,940 psi | 86% | 3045 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% | 47,703 psi | 75% | 2897 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,354 psi | 73% | 2959 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 49,922 psi | 78% | 3048 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,764 psi | 81% | 3035 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 47,079 psi | 74% | 2982 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 35,143 psi | 55% | 2710 fps | 96.4% |
| ADI AR 2218 | 109.8 gr | 90% | 43,236 psi | 68% | 2986 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 32,503 psi | 51% | 2680 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,025 psi | 82% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,561 psi | 81% | 3028 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,834 psi | 75% | 2986 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,572 psi | 73% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,741 psi | 64% | 2858 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,606 psi | 84% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,715 psi | 70% | 2979 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,802 psi | 70% | 2969 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,788 psi | 70% | 2884 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 44,527 psi | 70% | 2917 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 38,087 psi | 60% | 2792 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,834 psi | 75% | 2986 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,276 psi | 60% | 2792 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 49,429 psi | 77% | 2979 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,602 psi | 76% | 2963 fps | 98.9% |
| Hodgdon Retumbo | 92.1 gr | 80% | 39,856 psi | 62% | 2917 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1804 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,980 psi | 78% | 2959 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,890 psi | 72% | 2966 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,606 psi | 54% | 2720 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 41,104 psi | 64% | 2769 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,400 psi | 48% | 2618 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 51,140 psi | 80% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,514 psi | 73% | 2986 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,989 psi | 66% | 2851 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,465 psi | 62% | 2890 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,318 psi | 57% | 2772 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,199 psi | 82% | 3005 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,314 psi | 80% | 3018 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,165 psi | 71% | 2913 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,010 psi | 80% | 3015 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,388 psi | 84% | 2995 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,648 psi | 81% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,339 psi | 71% | 2861 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,790 psi | 75% | 2933 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,358 psi | 80% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,575 psi | 79% | 3061 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 42,322 psi | 66% | 2871 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 80% | 37,420 psi | 59% | 2792 fps | 95% |
| Vihtavuori N570 | 102.8 gr | 86% | 44,353 psi | 70% | 2989 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,180 psi | 72% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,848 psi | 75% | 2920 fps | 99.7% |
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 | 180gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,248 fps. Accurate 8700 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 180.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Sako Hammerhead 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.