Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | Lapua Subsonic bullet and 47 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 57,217 psi | 90% | 2913 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,997 psi | 83% | 2969 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 82% | 56,362 psi | 88% | 3035 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 56,927 psi | 89% | 3025 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,579 psi | 89% | 3012 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,145 psi | 90% | 3153 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 94% | 56,376 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,421 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,464 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,811 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,724 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,216 psi | 87% | 3058 fps | 99.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,477 psi | 87% | 3054 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,811 psi | 89% | 2986 fps | 99.4% |
| Bofors RP15 | <<locked>> | 86% | 57,029 psi | 89% | 3009 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,695 psi | 89% | 3028 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,464 psi | 90% | 3015 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 53,940 psi | 85% | 2969 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,332 psi | 87% | 2953 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,360 psi | 85% | 2933 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,637 psi | 89% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,058 psi | 60% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,376 psi | 87% | 2923 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 55,637 psi | 87% | 3009 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,230 psi | 85% | 2887 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,288 psi | 87% | 3022 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,695 psi | 87% | 2894 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,869 psi | 89% | 3045 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,682 psi | 90% | 3028 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,072 psi | 89% | 3035 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,448 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 61% | 1959 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,348 psi | 90% | 3081 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,405 psi | 88% | 3058 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,363 psi | 90% | 2979 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 2976 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,000 psi | 89% | 2979 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,566 psi | 90% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,215 psi | 85% | 2887 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,217 psi | 90% | 2982 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 82% | 57,580 psi | 90% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,913 psi | 89% | 3038 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 54,694 psi | 86% | 2982 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,739 psi | 89% | 3061 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 54,302 psi | 85% | 3064 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,130 psi | 90% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,435 psi | 90% | 2946 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% | 50,053 psi | 78% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,583 psi | 67% | 2772 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 80% | 52,489 psi | 82% | 2969 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 49,545 psi | 78% | 2900 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 37,115 psi | 58% | 2648 fps | 98.2% |
| ADI AR 2218 | 102 gr | 86% | 39,450 psi | 62% | 2785 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 34,476 psi | 54% | 2625 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,896 psi | 84% | 2933 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,314 psi | 79% | 2900 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,066 psi | 77% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,163 psi | 68% | 2776 fps | 100% |
| Alliant Reloder-33 | 101.5 gr | 84% | 40,959 psi | 64% | 2779 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 88% | 41,234 psi | 65% | 2779 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,847 psi | 73% | 2808 fps | 97.9% |
| Bofors RP15 | <<locked>> | 80% | 46,775 psi | 73% | 2835 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 40,350 psi | 63% | 2726 fps | 98.9% |
| Bofors RP5 | <<locked>> | 80% | 50,314 psi | 79% | 2900 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,509 psi | 63% | 2726 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 80% | 51,822 psi | 81% | 2894 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,894 psi | 80% | 2877 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,395 psi | 66% | 2848 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 45% | 1713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,011 psi | 82% | 2871 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 48,414 psi | 76% | 2887 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 50,865 psi | 80% | 2828 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,111 psi | 50% | 2539 fps | 96.1% |
| Lovex S071 | <<locked>> | 80% | 43,294 psi | 68% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,663 psi | 51% | 2572 fps | 98.4% |
| Norma MRP | <<locked>> | 80% | 53,853 psi | 84% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,284 psi | 77% | 2907 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 44,512 psi | 70% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 46% | 1752 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,090 psi | 66% | 2822 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,754 psi | 61% | 2720 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 53,737 psi | 84% | 2927 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 41,669 psi | 65% | 2726 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,388 psi | 84% | 2920 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,041 psi | 85% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,514 psi | 74% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 43,758 psi | 69% | 2733 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 53,983 psi | 85% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,185 psi | 83% | 2976 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 44,599 psi | 70% | 2795 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 39,740 psi | 62% | 2733 fps | 97.1% |
| Vihtavuori N570 | 95.3 gr | 82% | 40,712 psi | 64% | 2789 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,298 psi | 77% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,038 psi | 78% | 2831 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 47 powders for .30-378 Weath. Mag. loaded with the .308 | 200gr | Lapua Subsonic. ADI AR 2218 delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,153 fps. Accurate 8700 gives the best case fill at 100 %, and 47 of the 47 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 1:11.5 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 | 200gr | Lapua Subsonic 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.