Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | NorthFork Bonded Core bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo 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>> | 84% | 56,594 psi | 89% | 2900 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 2953 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 82% | 55,738 psi | 87% | 3018 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 82% | 57,348 psi | 90% | 2989 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,260 psi | 88% | 3012 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,811 psi | 87% | 2999 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,275 psi | 88% | 3136 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 94% | 55,622 psi | 87% | 3022 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,537 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,956 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,855 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,303 psi | 87% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,086 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,360 psi | 85% | 3041 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,505 psi | 85% | 3038 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,231 psi | 88% | 2972 fps | 99.3% |
| Bofors RP15 | <<locked>> | 86% | 56,231 psi | 88% | 2995 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,898 psi | 88% | 3012 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,855 psi | 89% | 3005 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,217 psi | 90% | 3015 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,737 psi | 86% | 2936 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,595 psi | 90% | 2982 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,753 psi | 87% | 3084 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1906 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,969 psi | 86% | 2913 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 54,984 psi | 86% | 2995 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,174 psi | 90% | 2930 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,563 psi | 86% | 3009 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,071 psi | 86% | 2881 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,057 psi | 88% | 3028 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,029 psi | 89% | 3018 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,376 psi | 88% | 3022 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,723 psi | 86% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,521 psi | 89% | 3068 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,477 psi | 87% | 3041 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 57,508 psi | 90% | 2956 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,913 psi | 89% | 2972 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 2959 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,550 psi | 89% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,956 psi | 89% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,276 psi | 90% | 2927 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,608 psi | 89% | 2966 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 82% | 56,884 psi | 89% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,304 psi | 88% | 3025 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 53,969 psi | 85% | 2966 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,854 psi | 88% | 3041 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 92% | 57,508 psi | 90% | 3117 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,347 psi | 88% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,869 psi | 89% | 2936 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% | 49,559 psi | 78% | 2795 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 41,858 psi | 66% | 2753 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 51,895 psi | 81% | 2953 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 80% | 53,679 psi | 84% | 2930 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,936 psi | 77% | 2887 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 36,680 psi | 57% | 2635 fps | 98% |
| ADI AR 2218 | 101 gr | 86% | 39,015 psi | 61% | 2769 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 33,968 psi | 53% | 2608 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,911 psi | 84% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,417 psi | 84% | 2920 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,676 psi | 78% | 2887 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,385 psi | 76% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,685 psi | 67% | 2766 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 40,321 psi | 63% | 2766 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 88% | 40,625 psi | 64% | 2762 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,383 psi | 73% | 2795 fps | 97.7% |
| Bofors RP15 | <<locked>> | 80% | 46,311 psi | 73% | 2825 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 39,871 psi | 62% | 2717 fps | 98.8% |
| Bofors RP5 | <<locked>> | 80% | 49,676 psi | 78% | 2887 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,943 psi | 63% | 2710 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 80% | 51,227 psi | 80% | 2877 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,328 psi | 79% | 2861 fps | 99.6% |
| Hodgdon Retumbo | 88.6 gr | 80% | 41,727 psi | 65% | 2831 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 45% | 1706 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,605 psi | 81% | 2858 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 47,761 psi | 75% | 2871 fps | 99.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 50,256 psi | 79% | 2812 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,589 psi | 50% | 2526 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 42,815 psi | 67% | 2674 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,082 psi | 50% | 2556 fps | 98.2% |
| Norma MRP | <<locked>> | 80% | 53,200 psi | 83% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,602 psi | 76% | 2894 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 43,772 psi | 69% | 2759 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 46% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,495 psi | 65% | 2812 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,087 psi | 60% | 2700 fps | 97% |
| Rottweil R 904 | <<locked>> | 80% | 53,882 psi | 84% | 2900 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 53,243 psi | 83% | 2913 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 43,932 psi | 69% | 2772 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,895 psi | 83% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,417 psi | 84% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,079 psi | 74% | 2766 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 43,265 psi | 68% | 2723 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 53,316 psi | 84% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,547 psi | 82% | 2963 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 44,164 psi | 69% | 2785 fps | 99% |
| Vihtavuori N568 | <<locked>> | 80% | 39,189 psi | 61% | 2720 fps | 96.8% |
| Vihtavuori N570 | 94.3 gr | 82% | 40,161 psi | 63% | 2776 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,515 psi | 76% | 2884 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,617 psi | 78% | 2822 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 50 powders for .30-378 Weath. Mag. loaded with the .308 | 200gr | NorthFork Bonded Core. ADI AR 2218 delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,136 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 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 1:12.0 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 200gr | NorthFork Bonded Core 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.