Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Sako SuperHammerhead bullet and 52 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% | 54,215 psi | 85% | 3005 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3022 fps | 96.8% |
| Accurate High Country | <<locked>> | 82% | 55,941 psi | 88% | 3166 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 57,058 psi | 89% | 3176 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 54,998 psi | 86% | 3091 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,595 psi | 90% | 3173 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,927 psi | 89% | 3153 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,522 psi | 90% | 3287 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 96% | 56,362 psi | 88% | 3176 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,187 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,650 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,317 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,304 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,971 psi | 89% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,159 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,448 psi | 87% | 3189 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,405 psi | 87% | 3176 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,696 psi | 90% | 3127 fps | 98.9% |
| Bofors RP15 | <<locked>> | 88% | 57,435 psi | 90% | 3153 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,811 psi | 89% | 3163 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,317 psi | 85% | 3104 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,375 psi | 85% | 3110 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,217 psi | 88% | 3097 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,216 psi | 87% | 3081 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,492 psi | 89% | 3238 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,942 psi | 59% | 2011 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,333 psi | 88% | 3074 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,028 psi | 88% | 3153 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,245 psi | 87% | 3153 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,144 psi | 88% | 3031 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,840 psi | 89% | 3179 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,331 psi | 85% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,551 psi | 90% | 3176 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,985 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 2057 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,595 psi | 90% | 3225 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,637 psi | 89% | 3192 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 55,390 psi | 87% | 3061 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,491 psi | 85% | 3074 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 3035 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,128 psi | 85% | 3068 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,739 psi | 89% | 3051 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,752 psi | 86% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,824 psi | 86% | 3025 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,157 psi | 85% | 3051 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 54,476 psi | 85% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,595 psi | 90% | 3186 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,100 psi | 86% | 3117 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,087 psi | 89% | 3196 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,462 psi | 85% | 3192 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,246 psi | 90% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,433 psi | 85% | 3035 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% | 47,297 psi | 74% | 2890 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,818 psi | 72% | 2953 fps | 95.8% |
| Accurate High Country | <<locked>> | 80% | 52,286 psi | 82% | 3100 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,414 psi | 77% | 3038 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 51,372 psi | 81% | 3028 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,702 psi | 73% | 2976 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 34,824 psi | 55% | 2700 fps | 96.2% |
| ADI AR 2218 | 108.9 gr | 90% | 42,699 psi | 67% | 2972 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 32,169 psi | 50% | 2671 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,648 psi | 81% | 3025 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,155 psi | 80% | 3018 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,471 psi | 74% | 2979 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,151 psi | 72% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,350 psi | 63% | 2848 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,011 psi | 83% | 3087 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,251 psi | 69% | 2969 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,367 psi | 70% | 2963 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,382 psi | 70% | 2874 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 44,150 psi | 69% | 2910 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,695 psi | 59% | 2782 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 47,471 psi | 74% | 2979 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,956 psi | 59% | 2782 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 80% | 49,095 psi | 77% | 2972 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,211 psi | 76% | 2953 fps | 98.8% |
| Hodgdon Retumbo | 91.4 gr | 80% | 39,450 psi | 62% | 2907 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1801 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,647 psi | 78% | 2953 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 45,498 psi | 71% | 2959 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,272 psi | 54% | 2713 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 40,857 psi | 64% | 2762 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,037 psi | 47% | 2608 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 50,749 psi | 80% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,122 psi | 72% | 2979 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 41,481 psi | 65% | 2838 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1844 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,972 psi | 61% | 2877 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,798 psi | 61% | 2835 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 51,822 psi | 81% | 2999 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,923 psi | 80% | 3012 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,759 psi | 70% | 2904 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,604 psi | 79% | 3009 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,953 psi | 83% | 2986 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 51,285 psi | 80% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,991 psi | 71% | 2854 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,369 psi | 74% | 2923 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 50,923 psi | 80% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,198 psi | 79% | 3054 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 41,989 psi | 66% | 2864 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 39,755 psi | 62% | 2848 fps | 95.9% |
| Vihtavuori N570 | 102 gr | 86% | 43,859 psi | 69% | 2979 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,759 psi | 72% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,514 psi | 74% | 2913 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 52 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Sako SuperHammerhead. ADI AR 2218 delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,287 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 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 1:14.0 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 SuperHammerhead 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.