Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Speer Magnum Tip Soft Point 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% | 54,491 psi | 85% | 3009 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,908 psi | 78% | 3031 fps | 97% |
| Accurate High Country | <<locked>> | 82% | 56,434 psi | 88% | 3173 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,508 psi | 90% | 3186 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,317 psi | 87% | 3097 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,186 psi | 85% | 3114 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 57,421 psi | 90% | 3159 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,911 psi | 84% | 3219 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 96% | 56,826 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,969 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,810 psi | 86% | 3110 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,811 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,450 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,696 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,028 psi | 88% | 3199 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,115 psi | 88% | 3189 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,418 psi | 85% | 3071 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 54,215 psi | 85% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,421 psi | 90% | 3173 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,810 psi | 86% | 3110 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,839 psi | 86% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,681 psi | 89% | 3107 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,680 psi | 87% | 3091 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,014 psi | 89% | 3245 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 60% | 2014 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,753 psi | 89% | 3077 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,521 psi | 89% | 3159 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,869 psi | 88% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,594 psi | 89% | 3041 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,290 psi | 90% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,824 psi | 86% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,041 psi | 85% | 3120 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,579 psi | 89% | 3107 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,972 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,708 psi | 84% | 3166 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,246 psi | 90% | 3199 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,666 psi | 87% | 3064 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,839 psi | 86% | 3077 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,837 psi | 81% | 3045 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,476 psi | 85% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,942 psi | 89% | 3054 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,071 psi | 86% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,245 psi | 87% | 3035 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,549 psi | 85% | 3058 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 54,824 psi | 86% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,172 psi | 85% | 3127 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,535 psi | 87% | 3127 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,508 psi | 90% | 3202 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,911 psi | 86% | 3202 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,592 psi | 84% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,882 psi | 86% | 3041 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,616 psi | 75% | 2894 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,296 psi | 73% | 2963 fps | 96% |
| Accurate High Country | <<locked>> | 80% | 52,605 psi | 82% | 3107 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,893 psi | 78% | 3048 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,706 psi | 81% | 3035 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,992 psi | 74% | 2982 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 35,085 psi | 55% | 2707 fps | 96.4% |
| ADI AR 2218 | <<locked>> | 90% | 43,178 psi | 68% | 2986 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 32,445 psi | 51% | 2677 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,488 psi | 81% | 3025 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,776 psi | 75% | 2986 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,485 psi | 73% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,683 psi | 64% | 2854 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,519 psi | 84% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,657 psi | 70% | 2976 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,744 psi | 70% | 2966 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,744 psi | 70% | 2884 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 44,440 psi | 70% | 2917 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 38,014 psi | 60% | 2792 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,776 psi | 75% | 2986 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,218 psi | 60% | 2789 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 49,400 psi | 77% | 2976 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,530 psi | 76% | 2959 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,769 psi | 62% | 2913 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1801 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,908 psi | 78% | 2959 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,803 psi | 72% | 2966 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,563 psi | 54% | 2720 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 41,176 psi | 65% | 2769 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,356 psi | 48% | 2615 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 51,068 psi | 80% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,470 psi | 73% | 2986 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,916 psi | 66% | 2848 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,392 psi | 62% | 2890 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,289 psi | 57% | 2769 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,112 psi | 82% | 3005 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,271 psi | 80% | 3015 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,107 psi | 71% | 2910 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,923 psi | 80% | 3015 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,316 psi | 84% | 2992 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,605 psi | 81% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,266 psi | 71% | 2861 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,718 psi | 75% | 2933 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,314 psi | 80% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,502 psi | 79% | 3061 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 42,279 psi | 66% | 2871 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 40,161 psi | 63% | 2861 fps | 96.1% |
| Vihtavuori N570 | <<locked>> | 86% | 44,295 psi | 69% | 2986 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,137 psi | 72% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,776 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 Magnum Tip Soft Point. 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 60–90 %, 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.