Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 208gr | Hornady A-MAX bullet and 49 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 Alliant Reloder-33.
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>> | 84% | 57,246 psi | 90% | 2861 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 2920 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 82% | 56,565 psi | 89% | 2982 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,971 psi | 89% | 2972 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,594 psi | 89% | 2959 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,276 psi | 90% | 3104 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 94% | 56,565 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,682 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,537 psi | 90% | 2963 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,086 psi | 88% | 2864 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,942 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,230 psi | 87% | 3009 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,521 psi | 87% | 3009 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,971 psi | 89% | 2936 fps | 99.5% |
| Bofors RP15 | <<locked>> | 86% | 57,130 psi | 90% | 2956 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,826 psi | 89% | 2976 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,537 psi | 90% | 2963 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,056 psi | 85% | 2920 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,506 psi | 87% | 2900 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,491 psi | 85% | 2884 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,753 psi | 89% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,116 psi | 60% | 1870 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,593 psi | 87% | 2877 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 55,680 psi | 87% | 2956 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,215 psi | 85% | 2835 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,419 psi | 87% | 2972 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 55,216 psi | 87% | 2887 fps | 95.9% |
| Lovex S071 | <<locked>> | 88% | 55,869 psi | 88% | 2841 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,014 psi | 89% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,276 psi | 90% | 2982 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 56,637 psi | 89% | 3025 fps | 96% |
| Ramshot Magnum | <<locked>> | 86% | 55,637 psi | 87% | 2907 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 61% | 1913 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,522 psi | 90% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,347 psi | 88% | 3005 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,638 psi | 90% | 2930 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 55,216 psi | 87% | 2887 fps | 95.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2927 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,276 psi | 90% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,711 psi | 90% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,259 psi | 85% | 2835 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,334 psi | 90% | 2933 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 82% | 57,653 psi | 90% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,043 psi | 89% | 2986 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 54,911 psi | 86% | 2933 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,724 psi | 89% | 3009 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 54,447 psi | 85% | 3015 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,334 psi | 90% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,537 psi | 90% | 2894 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% | 50,227 psi | 79% | 2756 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 39,639 psi | 62% | 2667 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 52,736 psi | 83% | 2920 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 49,632 psi | 78% | 2851 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 37,347 psi | 59% | 2608 fps | 98.5% |
| ADI AR 2218 | 99.5 gr | 86% | 39,610 psi | 62% | 2746 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 34,650 psi | 54% | 2582 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,041 psi | 85% | 2881 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,372 psi | 79% | 2848 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,168 psi | 77% | 2762 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,337 psi | 68% | 2730 fps | 100% |
| Alliant Reloder-33 | 96.6 gr | 82% | 38,087 psi | 60% | 2667 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 88% | 41,365 psi | 65% | 2736 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,876 psi | 73% | 2759 fps | 98.1% |
| Bofors RP15 | <<locked>> | 80% | 47,050 psi | 74% | 2792 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 40,509 psi | 63% | 2684 fps | 99.1% |
| Bofors RP5 | <<locked>> | 80% | 50,372 psi | 79% | 2848 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,553 psi | 64% | 2677 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,880 psi | 81% | 2841 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,952 psi | 80% | 2825 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,612 psi | 67% | 2802 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,703 psi | 45% | 1673 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,170 psi | 82% | 2818 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 48,602 psi | 76% | 2838 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 84% | 47,674 psi | 75% | 2717 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,213 psi | 50% | 2503 fps | 96.6% |
| Lovex D100 | <<locked>> | 90% | 51,488 psi | 81% | 2825 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,439 psi | 68% | 2641 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,822 psi | 51% | 2533 fps | 98.8% |
| Ramshot Grand | <<locked>> | 80% | 49,458 psi | 78% | 2858 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 52,736 psi | 83% | 2956 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 44,570 psi | 70% | 2730 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,443 psi | 46% | 1713 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,235 psi | 66% | 2779 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,899 psi | 61% | 2677 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 53,911 psi | 84% | 2874 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 51,488 psi | 81% | 2825 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 41,785 psi | 65% | 2687 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,563 psi | 84% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,099 psi | 85% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,688 psi | 75% | 2726 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 43,816 psi | 69% | 2690 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 54,128 psi | 85% | 2838 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,345 psi | 84% | 2927 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 44,860 psi | 70% | 2753 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 80% | 39,798 psi | 62% | 2690 fps | 97.4% |
| Vihtavuori N570 | 92.9 gr | 82% | 40,828 psi | 64% | 2746 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,458 psi | 78% | 2848 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,270 psi | 79% | 2782 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 49 powders for .30-378 Weath. Mag. loaded with the .308 | 208gr | Hornady A-MAX. ADI AR 2218 delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,104 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 208.0 gr projectile in 0.308" calls for a 1:11.0 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, Alliant Reloder-33 rank at the top here: for .30-378 Weath. Mag. with the .308 | 208gr | Hornady A-MAX 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.