Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 220gr | Sako Hammerhead bullet and 41 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 57,174 psi | 90% | 2785 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 53,911 psi | 84% | 2867 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 56,985 psi | 89% | 2897 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,072 psi | 89% | 2894 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,751 psi | 84% | 2976 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 57,334 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,566 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 56,057 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,217 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,941 psi | 88% | 2949 fps | 99.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,318 psi | 88% | 2949 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,652 psi | 89% | 2864 fps | 99.8% |
| Bofors RP15 | <<locked>> | 84% | 57,174 psi | 90% | 2884 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,043 psi | 89% | 2904 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,566 psi | 90% | 2887 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,418 psi | 85% | 2851 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,421 psi | 90% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,348 psi | 60% | 1831 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 54,447 psi | 85% | 2864 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 82% | 55,825 psi | 87% | 2884 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,464 psi | 90% | 2825 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,101 psi | 88% | 2910 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,230 psi | 87% | 2828 fps | 96.8% |
| Lovex S071 | <<locked>> | 86% | 55,854 psi | 88% | 2769 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,143 psi | 85% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,334 psi | 90% | 2907 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,203 psi | 90% | 2969 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 84% | 55,767 psi | 87% | 2835 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,421 psi | 62% | 1873 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,867 psi | 84% | 2897 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,869 psi | 89% | 2940 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,230 psi | 87% | 2828 fps | 96.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,419 psi | 87% | 2871 fps | 99.2% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,634 psi | 82% | 2848 fps | 97.6% |
| Vihtavuori 24N41 | <<locked>> | 94% | 55,042 psi | 86% | 2877 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 82% | 54,157 psi | 85% | 2759 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,276 psi | 90% | 2867 fps | 99% |
| Vihtavuori N565 | <<locked>> | 84% | 54,955 psi | 86% | 2861 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,159 psi | 90% | 2940 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,013 psi | 86% | 2949 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,290 psi | 90% | 2822 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% | 53,592 psi | 84% | 2736 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 37,463 psi | 59% | 2552 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 80% | 53,127 psi | 83% | 2838 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,263 psi | 63% | 2608 fps | 99.5% |
| ADI AR 2218 | 97.1 gr | 82% | 37,101 psi | 58% | 2621 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 37,565 psi | 59% | 2582 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,824 psi | 84% | 2831 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,533 psi | 82% | 2740 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,804 psi | 73% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,653 psi | 61% | 2618 fps | 96.2% |
| Alliant Reloder-50 | <<locked>> | 84% | 39,160 psi | 61% | 2621 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,777 psi | 78% | 2749 fps | 99.1% |
| Bofors RP15 | <<locked>> | 80% | 50,212 psi | 79% | 2776 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,787 psi | 69% | 2680 fps | 99.8% |
| Bofors RP5 | <<locked>> | 80% | 53,824 psi | 84% | 2831 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,874 psi | 69% | 2674 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,340 psi | 73% | 2799 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,848 psi | 45% | 1637 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 50,705 psi | 79% | 2802 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 80% | 52,011 psi | 82% | 2825 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 44,469 psi | 70% | 2598 fps | 95% |
| IMR 8133 Enduron | 87 gr | 80% | 35,099 psi | 55% | 2510 fps | 98.3% |
| Lovex D100 | <<locked>> | 88% | 51,488 psi | 81% | 2766 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 46,311 psi | 73% | 2621 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,911 psi | 56% | 2539 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 53,330 psi | 84% | 2848 fps | 100% |
| Ramshot LRT | <<locked>> | 90% | 49,661 psi | 78% | 2835 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 48,211 psi | 76% | 2720 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,747 psi | 47% | 1677 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,238 psi | 72% | 2776 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,395 psi | 66% | 2687 fps | 99% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,488 psi | 81% | 2766 fps | 95.9% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,595 psi | 62% | 2575 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,774 psi | 72% | 2723 fps | 95.9% |
| Vihtavuori 24N41 | <<locked>> | 92% | 51,358 psi | 80% | 2812 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 50,807 psi | 80% | 2710 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,830 psi | 69% | 2628 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 80% | 48,138 psi | 75% | 2746 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 43,207 psi | 68% | 2694 fps | 98.8% |
| Vihtavuori N570 | 92.8 gr | 80% | 41,350 psi | 65% | 2690 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,534 psi | 84% | 2766 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 41 powders for .30-378 Weath. Mag. loaded with the .308 | 220gr | Sako Hammerhead. ADI AR 2218 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,831 fps to 2,976 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 41 of the 41 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 220.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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 | 220gr | 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.