Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Norma SPFN bullet and 53 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>> | 88% | 57,392 psi | 90% | 3287 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,376 psi | 87% | 3389 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 56,449 psi | 88% | 3396 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 54,621 psi | 86% | 3320 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 56,956 psi | 89% | 3396 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 55,956 psi | 88% | 3366 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3484 fps | 97.7% |
| ADI AR 2225 | <<locked>> | 98% | 54,897 psi | 86% | 3386 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,259 psi | 85% | 3304 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,421 psi | 90% | 3389 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,492 psi | 87% | 3294 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,014 psi | 88% | 3369 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,231 psi | 88% | 3383 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,346 psi | 85% | 3383 fps | 96.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 3363 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,624 psi | 90% | 3346 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 56,782 psi | 89% | 3376 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 55,767 psi | 87% | 3376 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 57,421 psi | 90% | 3389 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 57,450 psi | 90% | 3392 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,014 psi | 88% | 3323 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,926 psi | 86% | 3301 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,781 psi | 86% | 3228 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,955 psi | 86% | 3455 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,695 psi | 59% | 2198 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,724 psi | 89% | 3297 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,551 psi | 90% | 3301 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,246 psi | 88% | 3297 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 55,288 psi | 87% | 3373 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,027 psi | 85% | 3356 fps | 99.4% |
| Lovex S071 | <<locked>> | 92% | 55,448 psi | 87% | 3258 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,245 psi | 87% | 3386 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,740 psi | 90% | 3409 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,637 psi | 89% | 3396 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 90% | 55,288 psi | 87% | 3317 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 2244 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,217 psi | 88% | 3442 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,564 psi | 87% | 3392 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 55,143 psi | 86% | 3284 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 86% | 57,711 psi | 90% | 3363 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,319 psi | 90% | 3356 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,637 psi | 89% | 3271 fps | 99% |
| Somchem S365 | <<locked>> | 82% | 57,000 psi | 89% | 3294 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,404 psi | 85% | 3264 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 88% | 54,462 psi | 85% | 3248 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 94% | 57,609 psi | 90% | 3323 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 57,290 psi | 90% | 3327 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,101 psi | 89% | 3409 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 54,389 psi | 85% | 3330 fps | 99% |
| Vihtavuori N568 | <<locked>> | 94% | 55,999 psi | 88% | 3399 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 96% | 57,348 psi | 90% | 3468 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,666 psi | 87% | 3383 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,172 psi | 85% | 3258 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,555 psi | 68% | 3031 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 47,979 psi | 75% | 3241 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 45,469 psi | 71% | 3169 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 47,587 psi | 75% | 3182 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 42,902 psi | 67% | 3110 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 39,363 psi | 62% | 3015 fps | 96% |
| ADI AR 2218 | <<locked>> | 96% | 48,863 psi | 77% | 3310 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 82% | 31,473 psi | 49% | 2828 fps | 95.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,471 psi | 74% | 3173 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,700 psi | 68% | 3117 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,424 psi | 66% | 3058 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,651 psi | 57% | 2972 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,341 psi | 76% | 3241 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 50,299 psi | 79% | 3301 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,183 psi | 79% | 3284 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,340 psi | 74% | 3143 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 40,596 psi | 64% | 3041 fps | 97.1% |
| Bofors RP30 | <<locked>> | 82% | 36,738 psi | 58% | 2959 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 43,700 psi | 68% | 3117 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 37,318 psi | 58% | 2966 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 45,469 psi | 71% | 3110 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,701 psi | 70% | 3094 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,285 psi | 80% | 3173 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,839 psi | 56% | 3009 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 44% | 1972 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,185 psi | 83% | 3232 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,882 psi | 84% | 3241 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,383 psi | 73% | 3104 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,669 psi | 65% | 3091 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 90% | 38,058 psi | 60% | 3005 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 37,550 psi | 59% | 2897 fps | 98.6% |
| Norma 217 | <<locked>> | 86% | 33,388 psi | 52% | 2897 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 46,514 psi | 73% | 3199 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 41,829 psi | 66% | 3100 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 80% | 37,666 psi | 59% | 2956 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 45% | 2018 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,259 psi | 55% | 2979 fps | 97.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 44,121 psi | 69% | 3159 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 48,370 psi | 76% | 3156 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 47,094 psi | 74% | 3163 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,789 psi | 73% | 3159 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 49,588 psi | 78% | 3140 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 53,185 psi | 83% | 3235 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,645 psi | 75% | 3136 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,539 psi | 65% | 2992 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 92% | 53,766 psi | 84% | 3251 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 47,007 psi | 74% | 3146 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,137 psi | 72% | 3189 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 41,162 psi | 65% | 3048 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 44,991 psi | 71% | 3173 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 92% | 49,487 psi | 78% | 3310 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,857 psi | 64% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,888 psi | 69% | 3054 fps | 98.2% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Norma SPFN. ADI AR 2218 delivers the highest muzzle velocity at 3,484 fps; across all powders the maximum-charge window runs from 2,198 fps to 3,484 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.