Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | Barnes X S 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, Alliant Reloder-50 and Vihtavuori N570.
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% | 56,405 psi | 88% | 2884 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,463 psi | 87% | 2995 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 82% | 55,027 psi | 86% | 2979 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 54,781 psi | 86% | 2972 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,216 psi | 87% | 3107 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 92% | 54,868 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,999 psi | 88% | 2979 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,723 psi | 86% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,332 psi | 87% | 2963 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,682 psi | 90% | 3087 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 54,911 psi | 86% | 3035 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 54,737 psi | 86% | 2936 fps | 99.1% |
| Bofors RP15 | <<locked>> | 84% | 55,579 psi | 87% | 2972 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 55,535 psi | 87% | 2995 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,999 psi | 88% | 2979 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,970 psi | 88% | 2986 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 57,305 psi | 90% | 2966 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,289 psi | 88% | 2949 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 54,940 psi | 86% | 3061 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,334 psi | 60% | 1906 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,203 psi | 90% | 2936 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 57,609 psi | 90% | 3025 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,782 psi | 87% | 2894 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,462 psi | 85% | 2995 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 57,450 psi | 90% | 2956 fps | 96% |
| Lovex S071 | <<locked>> | 86% | 55,317 psi | 87% | 2867 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,072 psi | 88% | 3018 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 55,245 psi | 87% | 2992 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 54,070 psi | 85% | 2923 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,436 psi | 62% | 1949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,506 psi | 87% | 3045 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,085 psi | 86% | 3025 fps | 99.9% |
| Shooters World 50 BMG | <<locked>> | 92% | 57,450 psi | 90% | 2956 fps | 96% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,363 psi | 90% | 3002 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 2917 fps | 96.1% |
| Vihtavuori N165 | <<locked>> | 84% | 56,275 psi | 88% | 2900 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,927 psi | 88% | 2943 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 86% | 57,319 psi | 90% | 3005 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 55,419 psi | 87% | 3025 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 56,768 psi | 89% | 3091 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,057 psi | 88% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,811 psi | 87% | 2907 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% | 53,156 psi | 83% | 2835 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 42,134 psi | 66% | 2749 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 51,503 psi | 81% | 2920 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 39,392 psi | 62% | 2684 fps | 98.7% |
| ADI AR 2218 | 97.5 gr | 84% | 39,175 psi | 61% | 2762 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 36,956 psi | 58% | 2671 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,547 psi | 82% | 2923 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,474 psi | 81% | 2835 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,600 psi | 71% | 2805 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 40,756 psi | 64% | 2766 fps | 95.8% |
| Alliant Reloder-50 | 101.3 gr | 86% | 41,756 psi | 65% | 2779 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,327 psi | 76% | 2822 fps | 98.1% |
| Bofors RP15 | <<locked>> | 80% | 49,153 psi | 77% | 2864 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,163 psi | 68% | 2772 fps | 99.4% |
| Bofors RP5 | <<locked>> | 80% | 52,547 psi | 82% | 2923 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 42,714 psi | 67% | 2756 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 80% | 53,737 psi | 84% | 2907 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,823 psi | 83% | 2890 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,759 psi | 70% | 2884 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,979 psi | 45% | 1706 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,809 psi | 84% | 2884 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 50,430 psi | 79% | 2910 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,385 psi | 77% | 2782 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,012 psi | 55% | 2605 fps | 97.4% |
| Lovex D100 | <<locked>> | 90% | 53,635 psi | 84% | 2894 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 46,340 psi | 73% | 2723 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,650 psi | 56% | 2635 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 51,663 psi | 81% | 2933 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,036 psi | 74% | 2808 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,762 psi | 47% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,730 psi | 70% | 2864 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,713 psi | 65% | 2772 fps | 98.1% |
| Shooters World 50 BMG | <<locked>> | 90% | 53,635 psi | 84% | 2894 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,727 psi | 65% | 2713 fps | 95.1% |
| Vihtavuori 20N29 | <<locked>> | 98% | 47,703 psi | 75% | 2858 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 49,806 psi | 78% | 2799 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,540 psi | 68% | 2713 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 80% | 47,427 psi | 74% | 2838 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 80% | 42,380 psi | 66% | 2779 fps | 97.8% |
| Vihtavuori N570 | 91 gr | 80% | 40,611 psi | 64% | 2772 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,185 psi | 82% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,359 psi | 82% | 2854 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 | Barnes X S. ADI AR 2218 delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,906 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 1:11.0 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, Alliant Reloder-50, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 200gr | Barnes X S 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.