Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Berger Target FB bullet and 59 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 55,071 psi | 86% | 3251 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,869 psi | 89% | 3419 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 86% | 53,896 psi | 84% | 3350 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 86% | 56,159 psi | 88% | 3350 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 54,650 psi | 86% | 3356 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 57,188 psi | 90% | 3389 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 3419 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 3412 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,492 psi | 89% | 3343 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,217 psi | 88% | 3343 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,883 psi | 88% | 3333 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,129 psi | 86% | 3350 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,782 psi | 89% | 3320 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,174 psi | 90% | 3392 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 53,548 psi | 84% | 3346 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,477 psi | 87% | 3406 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,535 psi | 87% | 3307 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 54,360 psi | 85% | 3337 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 57,058 psi | 89% | 3402 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 55,129 psi | 86% | 3350 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 54,737 psi | 86% | 3346 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 57,638 psi | 90% | 3350 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,623 psi | 89% | 3333 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,420 psi | 88% | 3255 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,028 psi | 88% | 3481 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 2182 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,810 psi | 86% | 3261 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,419 psi | 87% | 3268 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,375 psi | 85% | 3264 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,768 psi | 89% | 3399 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,256 psi | 80% | 3310 fps | 98.9% |
| Lovex S070 | <<locked>> | 82% | 57,014 psi | 89% | 3297 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,739 psi | 89% | 3278 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,086 psi | 88% | 3323 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3340 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,201 psi | 87% | 3369 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,971 psi | 89% | 3317 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,998 psi | 85% | 3353 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,057 psi | 88% | 3320 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,739 psi | 89% | 3343 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 2231 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,392 psi | 90% | 3471 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,768 psi | 89% | 3422 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 56,855 psi | 89% | 3317 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 55,492 psi | 87% | 3323 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 82% | 57,014 psi | 89% | 3297 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,682 psi | 90% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,100 psi | 86% | 3320 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 54,766 psi | 86% | 3238 fps | 98.6% |
| Somchem S365 | <<locked>> | 82% | 54,650 psi | 86% | 3261 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,927 psi | 88% | 3291 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,970 psi | 88% | 3274 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 54,955 psi | 86% | 3291 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,679 psi | 86% | 3369 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,521 psi | 87% | 3350 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 57,116 psi | 90% | 3425 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 96% | 54,201 psi | 85% | 3412 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,739 psi | 89% | 3409 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,941 psi | 88% | 3287 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,872 psi | 66% | 3002 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 45,919 psi | 72% | 3199 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 80% | 43,453 psi | 68% | 3130 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 45,861 psi | 72% | 3146 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 41,162 psi | 65% | 3071 fps | 96% |
| ADI AR 2217 | <<locked>> | 86% | 37,666 psi | 59% | 2969 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 50,053 psi | 78% | 3337 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 32,155 psi | 50% | 2854 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,238 psi | 72% | 3146 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,678 psi | 83% | 3284 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,832 psi | 72% | 3140 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,872 psi | 66% | 3077 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,553 psi | 64% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,041 psi | 55% | 2936 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,992 psi | 72% | 3202 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 51,329 psi | 80% | 3327 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,704 psi | 76% | 3173 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,928 psi | 61% | 3002 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 37,594 psi | 59% | 2989 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,872 psi | 66% | 3077 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 84% | 38,305 psi | 60% | 2992 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 43,787 psi | 69% | 3074 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,018 psi | 67% | 3058 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,530 psi | 78% | 3143 fps | 100% |
| Hodgdon Retumbo | 92.5 gr | 80% | 34,200 psi | 54% | 2963 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,547 psi | 81% | 3202 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 52,011 psi | 82% | 3209 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,904 psi | 70% | 3071 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 39,871 psi | 62% | 3048 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,754 psi | 61% | 3031 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,592 psi | 84% | 3238 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,998 psi | 56% | 2858 fps | 98% |
| Norma 204 | <<locked>> | 80% | 52,460 psi | 82% | 3258 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 33,895 psi | 53% | 2923 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 44,469 psi | 70% | 3159 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 53,447 psi | 84% | 3258 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,827 psi | 62% | 3054 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 52,518 psi | 82% | 3261 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,868 psi | 56% | 2913 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 2005 fps | 100% |
| ReloadSwiss RS 76 | 99 gr | 80% | 33,562 psi | 53% | 2930 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,597 psi | 65% | 3107 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 46,731 psi | 73% | 3120 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 45,368 psi | 71% | 3127 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 80% | 53,592 psi | 84% | 3238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,041 psi | 85% | 3186 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,020 psi | 71% | 3120 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 47,834 psi | 75% | 3104 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 51,140 psi | 80% | 3205 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,876 psi | 72% | 3100 fps | 99% |
| Vihtavuori N165 | <<locked>> | 80% | 40,001 psi | 63% | 2956 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 45,121 psi | 71% | 3114 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,193 psi | 69% | 3146 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 82% | 39,233 psi | 61% | 3005 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 45,948 psi | 72% | 3202 fps | 95.9% |
| Vihtavuori N570 | 112.8 gr | 94% | 50,517 psi | 79% | 3337 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,464 psi | 60% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,235 psi | 66% | 3018 fps | 97.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
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 | Berger Target FB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,481 fps; across all powders the maximum-charge window runs from 2,182 fps to 3,481 fps. ADI AR 2218 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. The 150.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Hodgdon TrailBoss 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Berger Target FB they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.