Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | Swift A-Frame bullet and 45 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 57,435 psi | 90% | 2913 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,330 psi | 84% | 2969 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 82% | 56,579 psi | 89% | 3031 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 57,101 psi | 89% | 3025 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,797 psi | 89% | 3015 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,479 psi | 90% | 3156 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 94% | 56,565 psi | 89% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,624 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,682 psi | 90% | 3018 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,999 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,942 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,361 psi | 87% | 3058 fps | 99.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,622 psi | 87% | 3054 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,000 psi | 89% | 2986 fps | 99.4% |
| Bofors RP15 | <<locked>> | 86% | 57,058 psi | 89% | 3009 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,884 psi | 89% | 3028 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,682 psi | 90% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,143 psi | 85% | 2969 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,535 psi | 87% | 2953 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,563 psi | 86% | 2936 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,884 psi | 89% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,043 psi | 60% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,564 psi | 87% | 2927 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 55,869 psi | 88% | 3012 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,389 psi | 85% | 2884 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,477 psi | 87% | 3025 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,912 psi | 88% | 2894 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,058 psi | 89% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,305 psi | 90% | 3035 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,637 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 1959 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,537 psi | 90% | 3081 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,565 psi | 89% | 3058 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,580 psi | 90% | 2982 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 2979 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,203 psi | 90% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,418 psi | 85% | 2884 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,363 psi | 90% | 2982 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 82% | 57,653 psi | 90% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,130 psi | 90% | 3038 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 54,868 psi | 86% | 2982 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,942 psi | 89% | 3058 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 54,491 psi | 85% | 3064 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,406 psi | 90% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,624 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% | 50,256 psi | 79% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,714 psi | 67% | 2772 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 52,707 psi | 83% | 2966 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 49,763 psi | 78% | 2900 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 37,275 psi | 58% | 2648 fps | 98.2% |
| ADI AR 2218 | 102.4 gr | 86% | 39,697 psi | 62% | 2789 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 34,635 psi | 54% | 2625 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,070 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,502 psi | 79% | 2900 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,110 psi | 77% | 2812 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,366 psi | 68% | 2779 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,118 psi | 64% | 2779 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 88% | 41,394 psi | 65% | 2779 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,862 psi | 73% | 2805 fps | 97.9% |
| Bofors RP15 | <<locked>> | 80% | 46,978 psi | 74% | 2835 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 40,524 psi | 64% | 2730 fps | 98.9% |
| Bofors RP5 | <<locked>> | 80% | 50,502 psi | 79% | 2900 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,683 psi | 64% | 2726 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 80% | 51,866 psi | 81% | 2890 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,082 psi | 80% | 2877 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,598 psi | 67% | 2851 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 45% | 1709 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,185 psi | 82% | 2871 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 48,602 psi | 76% | 2887 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 50,850 psi | 80% | 2825 fps | 95.6% |
| IMR 8133 Enduron | 87.4 gr | 80% | 32,184 psi | 50% | 2543 fps | 96.1% |
| Lovex S071 | <<locked>> | 80% | 43,366 psi | 68% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,735 psi | 51% | 2569 fps | 98.4% |
| Ramshot Grand | <<locked>> | 80% | 49,472 psi | 78% | 2907 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 44,570 psi | 70% | 2776 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 46% | 1752 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,308 psi | 66% | 2825 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,928 psi | 61% | 2720 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 53,940 psi | 85% | 2927 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 41,829 psi | 66% | 2726 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,592 psi | 84% | 2923 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,674 psi | 75% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 43,888 psi | 69% | 2736 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 54,070 psi | 85% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,374 psi | 84% | 2979 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 44,802 psi | 70% | 2799 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 39,943 psi | 63% | 2736 fps | 97.1% |
| Vihtavuori N570 | 95.6 gr | 82% | 40,915 psi | 64% | 2792 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,545 psi | 78% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,227 psi | 79% | 2835 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 45 powders for .30-378 Weath. Mag. loaded with the .308 | 200gr | Swift A-Frame. ADI AR 2218 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,156 fps. Accurate 8700 gives the best case fill at 100 %, and 45 of the 45 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 1:13.0 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, IMR 8133 Enduron rank at the top here: for .30-378 Weath. Mag. with the .308 | 200gr | Swift A-Frame 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.