Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | Sako Hammerhead bullet and 42 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 IMR 8133 Enduron.
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>> | 82% | 54,128 psi | 85% | 2867 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 2982 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 82% | 57,029 psi | 89% | 3041 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 57,595 psi | 90% | 3031 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,261 psi | 90% | 3022 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 53,824 psi | 84% | 3094 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 57,217 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,404 psi | 85% | 2966 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,536 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,464 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,115 psi | 88% | 3068 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,362 psi | 88% | 3064 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,493 psi | 90% | 2995 fps | 99.5% |
| Bofors RP15 | <<locked>> | 86% | 57,725 psi | 90% | 3018 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,334 psi | 90% | 3035 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,404 psi | 85% | 2966 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,636 psi | 86% | 2979 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,014 psi | 88% | 2959 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,998 psi | 86% | 2946 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,421 psi | 90% | 3107 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,174 psi | 60% | 1916 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,028 psi | 88% | 2933 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,376 psi | 88% | 3022 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,766 psi | 86% | 2894 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,101 psi | 88% | 3031 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,420 psi | 88% | 2900 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,725 psi | 90% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,766 psi | 84% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,304 psi | 88% | 2966 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 1962 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,012 psi | 85% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,203 psi | 90% | 3068 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2986 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,740 psi | 90% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,868 psi | 86% | 2894 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,244 psi | 85% | 2930 fps | 97.9% |
| Vihtavuori N560 | <<locked>> | 82% | 57,609 psi | 90% | 3045 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,347 psi | 87% | 2989 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 57,551 psi | 90% | 3071 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 55,114 psi | 86% | 3074 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 53,969 psi | 85% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,273 psi | 85% | 2900 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% | 50,589 psi | 79% | 2812 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 40,205 psi | 63% | 2720 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 80% | 53,171 psi | 83% | 2976 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 50,111 psi | 79% | 2910 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 37,681 psi | 59% | 2657 fps | 98.4% |
| ADI AR 2218 | 103.2 gr | 86% | 40,059 psi | 63% | 2799 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 34,954 psi | 55% | 2635 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,865 psi | 80% | 2907 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,661 psi | 78% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,859 psi | 69% | 2785 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 38,609 psi | 61% | 2720 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 88% | 41,901 psi | 66% | 2789 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,224 psi | 74% | 2815 fps | 98% |
| Bofors RP15 | <<locked>> | 80% | 47,456 psi | 74% | 2844 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 40,857 psi | 64% | 2736 fps | 99% |
| Bofors RP5 | <<locked>> | 80% | 50,865 psi | 80% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,017 psi | 64% | 2733 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 80% | 52,344 psi | 82% | 2900 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,416 psi | 81% | 2884 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,004 psi | 67% | 2854 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,703 psi | 45% | 1716 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,634 psi | 82% | 2877 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 48,950 psi | 77% | 2894 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,416 psi | 81% | 2835 fps | 95.8% |
| IMR 8133 Enduron | 88.2 gr | 80% | 32,619 psi | 51% | 2549 fps | 96.3% |
| Lovex S071 | <<locked>> | 80% | 43,729 psi | 69% | 2694 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,214 psi | 52% | 2579 fps | 98.6% |
| Ramshot Grand | <<locked>> | 80% | 50,009 psi | 78% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 45,020 psi | 71% | 2782 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,559 psi | 46% | 1759 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,786 psi | 67% | 2835 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,378 psi | 62% | 2730 fps | 97.5% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,293 psi | 66% | 2740 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,114 psi | 85% | 2930 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,008 psi | 75% | 2782 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,295 psi | 69% | 2746 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 80% | 53,867 psi | 84% | 2986 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 45,252 psi | 71% | 2808 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 80% | 40,379 psi | 63% | 2746 fps | 97.3% |
| Vihtavuori N570 | 96.4 gr | 82% | 41,350 psi | 65% | 2799 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,125 psi | 79% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,705 psi | 79% | 2841 fps | 100% |
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 42 powders for .30-378 Weath. Mag. loaded with the .308 | 200gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,107 fps. Accurate 8700 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 200.0 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, IMR 8133 Enduron rank at the top here: for .30-378 Weath. Mag. with the .308 | 200gr | 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.