Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Speer Hot-Cor bullet and 51 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% | 54,447 psi | 85% | 3009 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 3028 fps | 96.9% |
| Accurate High Country | <<locked>> | 82% | 56,362 psi | 88% | 3173 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 57,464 psi | 90% | 3182 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,245 psi | 87% | 3094 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 53,983 psi | 85% | 3110 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 57,319 psi | 90% | 3159 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,838 psi | 84% | 3215 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 96% | 56,782 psi | 89% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,911 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,592 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,753 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,406 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,450 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,796 psi | 87% | 3192 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,912 psi | 88% | 3186 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,375 psi | 85% | 3071 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 54,157 psi | 85% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,203 psi | 90% | 3169 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,592 psi | 86% | 3107 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,781 psi | 86% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,623 psi | 89% | 3104 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,477 psi | 87% | 3084 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,956 psi | 89% | 3245 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 59% | 2014 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,710 psi | 89% | 3081 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,449 psi | 88% | 3159 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,782 psi | 87% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,536 psi | 89% | 3038 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,217 psi | 90% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,766 psi | 86% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,809 psi | 84% | 3117 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,536 psi | 89% | 3107 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,030 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,650 psi | 84% | 3166 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,159 psi | 90% | 3199 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,608 psi | 87% | 3064 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,781 psi | 86% | 3077 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,793 psi | 81% | 3041 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,418 psi | 85% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,898 psi | 89% | 3054 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,013 psi | 86% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,201 psi | 87% | 3031 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,462 psi | 85% | 3058 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 54,766 psi | 86% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,114 psi | 85% | 3127 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,492 psi | 87% | 3123 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,435 psi | 90% | 3202 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,868 psi | 86% | 3202 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,696 psi | 90% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,839 psi | 86% | 3041 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,558 psi | 75% | 2894 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,224 psi | 72% | 2959 fps | 95.9% |
| Accurate High Country | <<locked>> | 80% | 52,547 psi | 82% | 3107 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,835 psi | 78% | 3048 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,634 psi | 81% | 3035 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,934 psi | 74% | 2982 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 35,027 psi | 55% | 2707 fps | 96.3% |
| ADI AR 2218 | <<locked>> | 90% | 43,105 psi | 68% | 2986 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 32,401 psi | 51% | 2677 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,430 psi | 81% | 3025 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,718 psi | 75% | 2982 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,412 psi | 73% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,625 psi | 64% | 2854 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,447 psi | 84% | 3094 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,614 psi | 70% | 2976 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,730 psi | 70% | 2966 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,701 psi | 70% | 2884 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 44,411 psi | 70% | 2913 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 37,956 psi | 59% | 2789 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,718 psi | 75% | 2982 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 38,174 psi | 60% | 2789 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 49,342 psi | 77% | 2976 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,472 psi | 76% | 2959 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,711 psi | 62% | 2913 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 1804 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,850 psi | 78% | 2959 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,745 psi | 72% | 2963 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,519 psi | 54% | 2717 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 41,104 psi | 64% | 2769 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,298 psi | 47% | 2615 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 51,010 psi | 80% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,412 psi | 73% | 2982 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,858 psi | 66% | 2848 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,334 psi | 62% | 2887 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,245 psi | 57% | 2769 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,054 psi | 82% | 3002 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,213 psi | 80% | 3018 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,034 psi | 71% | 2910 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,865 psi | 80% | 3012 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,272 psi | 83% | 2992 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,547 psi | 81% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,208 psi | 71% | 2858 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,688 psi | 75% | 2930 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,242 psi | 80% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,444 psi | 79% | 3058 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 42,221 psi | 66% | 2867 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 40,118 psi | 63% | 2858 fps | 96% |
| Vihtavuori N570 | <<locked>> | 86% | 44,237 psi | 69% | 2986 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,021 psi | 72% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,718 psi | 75% | 2917 fps | 99.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Speer Hot-Cor. 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 58 of the 58 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 1:14.5 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.