Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Woodleigh PP SN bullet and 50 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 54,549 psi | 85% | 3009 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 3028 fps | 97% |
| Accurate High Country | <<locked>> | 82% | 56,492 psi | 89% | 3176 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,566 psi | 90% | 3186 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,376 psi | 87% | 3097 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,244 psi | 85% | 3117 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 57,464 psi | 90% | 3163 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,940 psi | 85% | 3222 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 96% | 57,072 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,027 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,868 psi | 86% | 3114 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,869 psi | 89% | 3071 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,508 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,043 psi | 88% | 3199 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,188 psi | 88% | 3189 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,607 psi | 86% | 3074 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 54,273 psi | 85% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,464 psi | 90% | 3173 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,868 psi | 86% | 3114 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,882 psi | 86% | 3120 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,724 psi | 89% | 3107 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,738 psi | 87% | 3087 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,087 psi | 89% | 3245 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 2014 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,811 psi | 89% | 3081 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,579 psi | 89% | 3159 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,912 psi | 88% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,652 psi | 89% | 3041 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,334 psi | 90% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,882 psi | 86% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,099 psi | 85% | 3123 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,623 psi | 89% | 3107 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,925 psi | 85% | 3169 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,276 psi | 90% | 3202 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,724 psi | 87% | 3064 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,897 psi | 86% | 3077 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,880 psi | 81% | 3045 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,534 psi | 85% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,985 psi | 89% | 3054 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,114 psi | 86% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,303 psi | 87% | 3035 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,737 psi | 86% | 3061 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 54,897 psi | 86% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,230 psi | 85% | 3127 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,579 psi | 87% | 3127 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,537 psi | 90% | 3202 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 55,143 psi | 86% | 3205 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,664 psi | 84% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,940 psi | 86% | 3041 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,674 psi | 75% | 2894 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,325 psi | 73% | 2963 fps | 96% |
| Accurate High Country | <<locked>> | 80% | 52,678 psi | 83% | 3110 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,937 psi | 78% | 3051 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,764 psi | 81% | 3035 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 47,050 psi | 74% | 2982 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 35,128 psi | 55% | 2710 fps | 96.4% |
| ADI AR 2218 | <<locked>> | 90% | 43,207 psi | 68% | 2986 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 32,489 psi | 51% | 2680 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,547 psi | 81% | 3025 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,819 psi | 75% | 2986 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,543 psi | 73% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,741 psi | 64% | 2854 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,686 psi | 70% | 2976 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,933 psi | 70% | 2972 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,788 psi | 70% | 2887 fps | 96.4% |
| Bofors RP15 | <<locked>> | 80% | 44,512 psi | 70% | 2917 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 38,072 psi | 60% | 2792 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,819 psi | 75% | 2986 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,276 psi | 60% | 2792 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 49,458 psi | 78% | 2979 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,588 psi | 76% | 2963 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,842 psi | 62% | 2913 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1804 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,966 psi | 78% | 2963 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,876 psi | 72% | 2966 fps | 99% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,621 psi | 54% | 2720 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 41,118 psi | 64% | 2769 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,414 psi | 48% | 2618 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 51,126 psi | 80% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,528 psi | 73% | 2986 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,959 psi | 66% | 2848 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,436 psi | 62% | 2887 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,332 psi | 57% | 2772 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,170 psi | 82% | 3005 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,329 psi | 80% | 3018 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,136 psi | 71% | 2913 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,981 psi | 80% | 3012 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,374 psi | 84% | 2995 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,663 psi | 81% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,324 psi | 71% | 2861 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,790 psi | 75% | 2930 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,372 psi | 81% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,560 psi | 79% | 3061 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 42,322 psi | 66% | 2867 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 80% | 37,391 psi | 59% | 2792 fps | 95% |
| Vihtavuori N570 | <<locked>> | 86% | 44,338 psi | 69% | 2989 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,195 psi | 72% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,834 psi | 75% | 2920 fps | 99.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 57 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,245 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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 US 869, Lovex D100, Ramshot LRT 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.