Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Speer Magnum Tip Soft Point bullet and 54 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>> | 88% | 56,637 psi | 89% | 3278 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,433 psi | 85% | 3373 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 86% | 55,564 psi | 87% | 3379 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 84% | 53,911 psi | 84% | 3307 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 88% | 56,246 psi | 88% | 3383 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 55,129 psi | 86% | 3353 fps | 99.5% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3461 fps | 97.3% |
| ADI AR 2225 | <<locked>> | 98% | 54,085 psi | 85% | 3376 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,740 psi | 90% | 3366 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,246 psi | 90% | 3360 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,724 psi | 89% | 3376 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,737 psi | 86% | 3284 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,129 psi | 86% | 3356 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,419 psi | 87% | 3373 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,595 psi | 90% | 3442 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,971 psi | 89% | 3333 fps | 97.6% |
| Bofors RP15 | <<locked>> | 90% | 56,057 psi | 88% | 3363 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 54,911 psi | 86% | 3363 fps | 99.5% |
| Bofors RP5 | <<locked>> | 88% | 56,724 psi | 89% | 3376 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 56,536 psi | 89% | 3376 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 55,347 psi | 87% | 3310 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,244 psi | 85% | 3287 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,143 psi | 85% | 3219 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,172 psi | 85% | 3445 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 59% | 2192 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,188 psi | 88% | 3287 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,942 psi | 89% | 3291 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,738 psi | 87% | 3291 fps | 99% |
| IMR 7828 SSC | <<locked>> | 88% | 54,563 psi | 86% | 3360 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,997 psi | 83% | 3337 fps | 99.2% |
| Lovex S071 | <<locked>> | 92% | 54,737 psi | 86% | 3245 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,464 psi | 90% | 3346 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 54,186 psi | 85% | 3369 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,826 psi | 89% | 3396 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,869 psi | 88% | 3386 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 57,464 psi | 90% | 3346 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,447 psi | 85% | 3307 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 60% | 2241 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,085 psi | 86% | 3425 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,592 psi | 86% | 3379 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 84% | 54,433 psi | 85% | 3274 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 56,956 psi | 89% | 3350 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,565 psi | 89% | 3346 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 56,057 psi | 88% | 3261 fps | 98.9% |
| Somchem S365 | <<locked>> | 82% | 56,289 psi | 88% | 3284 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,392 psi | 90% | 3317 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,377 psi | 90% | 3297 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,521 psi | 89% | 3317 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,202 psi | 88% | 3392 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 92% | 57,305 psi | 90% | 3383 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 55,027 psi | 86% | 3383 fps | 98.3% |
| Vihtavuori N570 | <<locked>> | 96% | 56,362 psi | 88% | 3451 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,621 psi | 86% | 3373 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,363 psi | 90% | 3310 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,989 psi | 67% | 3022 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 47,224 psi | 74% | 3228 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 80% | 44,773 psi | 70% | 3156 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 46,992 psi | 74% | 3169 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 42,351 psi | 66% | 3097 fps | 96.5% |
| ADI AR 2217 | <<locked>> | 86% | 38,769 psi | 61% | 2999 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 98% | 51,822 psi | 81% | 3379 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 82% | 30,951 psi | 49% | 2815 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,012 psi | 85% | 3304 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,920 psi | 74% | 3163 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,105 psi | 68% | 3104 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,785 psi | 65% | 3048 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,114 psi | 57% | 2959 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,543 psi | 75% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,414 psi | 77% | 3287 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,760 psi | 73% | 3133 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 40,030 psi | 63% | 3028 fps | 96.9% |
| Bofors RP30 | <<locked>> | 84% | 38,769 psi | 61% | 3015 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,105 psi | 68% | 3104 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 36,738 psi | 58% | 2949 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,947 psi | 70% | 3100 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,179 psi | 69% | 3084 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,792 psi | 80% | 3163 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,201 psi | 55% | 2992 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1969 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,620 psi | 82% | 3225 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 53,243 psi | 83% | 3232 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,876 psi | 72% | 3094 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 40,973 psi | 64% | 3071 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,434 psi | 59% | 2992 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 36,999 psi | 58% | 2884 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 53,693 psi | 84% | 3281 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 32,851 psi | 51% | 2884 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 45,788 psi | 72% | 3186 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 41,104 psi | 64% | 3084 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 80% | 53,795 psi | 84% | 3281 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,115 psi | 58% | 2943 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,964 psi | 45% | 2014 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,679 psi | 54% | 2959 fps | 97.1% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 43,221 psi | 68% | 3143 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 47,805 psi | 75% | 3143 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 46,499 psi | 73% | 3150 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,195 psi | 72% | 3146 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 48,979 psi | 77% | 3127 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 52,504 psi | 82% | 3225 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,079 psi | 74% | 3127 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 80% | 41,002 psi | 64% | 2979 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 46,354 psi | 73% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,426 psi | 71% | 3176 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 40,509 psi | 63% | 3031 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 88% | 44,208 psi | 69% | 3159 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 94% | 52,286 psi | 82% | 3369 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,972 psi | 63% | 3100 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,395 psi | 68% | 3041 fps | 98% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 62 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Speer Magnum Tip Soft Point. ADI AR 2218 delivers the highest muzzle velocity at 3,461 fps; across all powders the maximum-charge window runs from 2,192 fps to 3,461 fps. Accurate 8700 gives the best case fill at 100 %, and 62 of the 62 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 150.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. 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.