Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | Woodleigh PP SN bullet and 42 powders. The key underlying parameters are shown in the table above.
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% | 57,696 psi | 90% | 2917 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2976 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 82% | 56,985 psi | 89% | 3038 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 57,392 psi | 90% | 3028 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,203 psi | 90% | 3018 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 53,650 psi | 84% | 3087 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 57,014 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,172 psi | 85% | 2963 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,318 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,217 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,753 psi | 87% | 3064 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,173 psi | 88% | 3064 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,305 psi | 90% | 2992 fps | 99.5% |
| Bofors RP15 | <<locked>> | 86% | 57,479 psi | 90% | 3015 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,101 psi | 89% | 3031 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,172 psi | 85% | 2963 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,607 psi | 86% | 2976 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,767 psi | 87% | 2956 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,795 psi | 86% | 2940 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,203 psi | 90% | 3104 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,174 psi | 60% | 1916 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,796 psi | 87% | 2930 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,115 psi | 88% | 3015 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,563 psi | 86% | 2890 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,883 psi | 88% | 3028 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,202 psi | 88% | 2897 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,493 psi | 90% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,548 psi | 84% | 2976 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,072 psi | 88% | 2963 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 1962 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 53,766 psi | 84% | 3025 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,985 psi | 89% | 3064 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,434 psi | 87% | 2982 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,493 psi | 90% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,665 psi | 86% | 2890 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,711 psi | 90% | 2989 fps | 98.5% |
| Vihtavuori N560 | <<locked>> | 82% | 57,406 psi | 90% | 3045 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,303 psi | 87% | 2986 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 57,334 psi | 90% | 3068 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 54,897 psi | 86% | 3071 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 53,708 psi | 84% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,056 psi | 85% | 2894 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 50,517 psi | 79% | 2812 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 40,045 psi | 63% | 2717 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 80% | 53,113 psi | 83% | 2976 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 50,024 psi | 78% | 2907 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 37,507 psi | 59% | 2654 fps | 98.3% |
| ADI AR 2218 | <<locked>> | 86% | 39,900 psi | 63% | 2795 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 34,882 psi | 55% | 2631 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,763 psi | 80% | 2907 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,400 psi | 77% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,642 psi | 68% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 38,551 psi | 60% | 2720 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 88% | 41,727 psi | 65% | 2785 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,195 psi | 74% | 2812 fps | 97.9% |
| Bofors RP15 | <<locked>> | 80% | 47,239 psi | 74% | 2841 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 40,785 psi | 64% | 2733 fps | 99% |
| Bofors RP5 | <<locked>> | 80% | 50,763 psi | 80% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,959 psi | 64% | 2733 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 80% | 52,257 psi | 82% | 2900 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,343 psi | 80% | 2881 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,931 psi | 67% | 2854 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,417 psi | 82% | 2874 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 48,878 psi | 77% | 2894 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,213 psi | 80% | 2831 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,445 psi | 51% | 2546 fps | 96.3% |
| Lovex S071 | <<locked>> | 80% | 43,627 psi | 68% | 2690 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,025 psi | 52% | 2579 fps | 98.5% |
| Ramshot Grand | <<locked>> | 80% | 49,792 psi | 78% | 2913 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 44,991 psi | 71% | 2782 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,530 psi | 46% | 1755 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,569 psi | 67% | 2828 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,175 psi | 61% | 2726 fps | 97.4% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,148 psi | 66% | 2736 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,867 psi | 84% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,964 psi | 75% | 2782 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,106 psi | 69% | 2740 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 80% | 53,650 psi | 84% | 2982 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 45,049 psi | 71% | 2805 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 40,190 psi | 63% | 2743 fps | 97.2% |
| Vihtavuori N570 | <<locked>> | 82% | 41,147 psi | 64% | 2795 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,879 psi | 78% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,488 psi | 79% | 2838 fps | 100% |
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 | 200gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,916 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 200.0 gr projectile in 0.308" calls for a 1:13.5 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. As outliers, Hodgdon 50BMG burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.