Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 125gr | Hornady SST bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Ramshot Grand.
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>> | 92% | 56,391 psi | 88% | 3501 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,855 psi | 89% | 3550 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,099 psi | 85% | 3593 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 90% | 55,245 psi | 87% | 3596 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 88% | 54,143 psi | 85% | 3540 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 92% | 56,115 psi | 88% | 3606 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 3553 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,979 psi | 77% | 3497 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,360 psi | 85% | 3533 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,711 psi | 90% | 3615 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,522 psi | 90% | 3593 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,420 psi | 88% | 3606 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,696 psi | 90% | 3576 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 53,751 psi | 84% | 3573 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,491 psi | 85% | 3602 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 55,419 psi | 87% | 3579 fps | 98.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 3638 fps | 98.8% |
| Bofors RP5 | <<locked>> | 92% | 56,420 psi | 88% | 3606 fps | 99.1% |
| Bofors RP7 | <<locked>> | 82% | 54,868 psi | 86% | 3484 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 98% | 56,057 psi | 88% | 3589 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 54,505 psi | 85% | 3537 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 82% | 56,855 psi | 89% | 3560 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 90% | 55,666 psi | 87% | 3533 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,549 psi | 85% | 3514 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,230 psi | 85% | 3465 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,565 psi | 89% | 3727 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 82% | 55,419 psi | 87% | 3570 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,101 psi | 58% | 2362 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,782 psi | 89% | 3527 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,173 psi | 88% | 3514 fps | 99.6% |
| IMR 4831 | <<locked>> | 86% | 57,072 psi | 89% | 3537 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,347 psi | 88% | 3520 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 92% | 54,099 psi | 85% | 3576 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 57,029 psi | 89% | 3510 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,419 psi | 87% | 3501 fps | 99.7% |
| Lovex S071 | <<locked>> | 96% | 54,070 psi | 85% | 3461 fps | 99.9% |
| Norma 204 | <<locked>> | 84% | 54,404 psi | 85% | 3517 fps | 98.5% |
| Norma 217ᴾ | <<locked>> | 100% | 44,759 psi | 70% | 3406 fps | 98% |
| Norma MRP | <<locked>> | 90% | 56,347 psi | 88% | 3625 fps | 99.7% |
| Norma URP | <<locked>> | 84% | 55,042 psi | 86% | 3527 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,911 psi | 86% | 3599 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 84% | 54,172 psi | 85% | 3524 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 94% | 53,780 psi | 84% | 3520 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 60% | 2415 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,058 psi | 89% | 3570 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,506 psi | 87% | 3596 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 53,867 psi | 84% | 3638 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 53,388 psi | 84% | 3573 fps | 96.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,056 psi | 86% | 3504 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 90% | 57,101 psi | 89% | 3583 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 82% | 54,868 psi | 86% | 3484 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,029 psi | 89% | 3510 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,419 psi | 87% | 3501 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,362 psi | 88% | 3455 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,666 psi | 89% | 3576 fps | 99.1% |
| Somchem S361 | <<locked>> | 88% | 56,884 psi | 89% | 3488 fps | 97.7% |
| Somchem S365 | <<locked>> | 86% | 55,898 psi | 88% | 3530 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,609 psi | 90% | 3547 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 57,116 psi | 90% | 3451 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,768 psi | 89% | 3517 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,377 psi | 90% | 3520 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 84% | 56,086 psi | 88% | 3520 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,956 psi | 88% | 3550 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,956 psi | 88% | 3615 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 96% | 56,623 psi | 89% | 3593 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 98% | 53,896 psi | 84% | 3579 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,623 psi | 89% | 3458 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,650 psi | 86% | 3540 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,913 psi | 89% | 3665 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,725 psi | 90% | 3540 fps | 99.2% |
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% | 37,072 psi | 58% | 3091 fps | 96.8% |
| Accurate 4350 | <<locked>> | 80% | 49,356 psi | 77% | 3412 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 46,760 psi | 73% | 3438 fps | 96% |
| Accurate MAGPRO | <<locked>> | 88% | 51,343 psi | 80% | 3517 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 41,002 psi | 64% | 3248 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 86% | 45,324 psi | 71% | 3376 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 94% | 44,048 psi | 69% | 3327 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 92% | 37,246 psi | 58% | 3196 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,423 psi | 65% | 3248 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,079 psi | 74% | 3422 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,046 psi | 64% | 3238 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 42,583 psi | 67% | 3307 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,578 psi | 56% | 3123 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 33,054 psi | 52% | 3071 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,842 psi | 62% | 3287 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 42,308 psi | 66% | 3297 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 43,482 psi | 68% | 3340 fps | 95.5% |
| Bofors RP5 | <<locked>> | 84% | 42,583 psi | 67% | 3307 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 51,387 psi | 81% | 3419 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 90% | 42,090 psi | 66% | 3281 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 50,879 psi | 80% | 3465 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 53,156 psi | 83% | 3488 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 48,312 psi | 76% | 3386 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 47,471 psi | 74% | 3366 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,251 psi | 69% | 3274 fps | 100% |
| Hodgdon Retumbo | 103.2 gr | 88% | 39,755 psi | 62% | 3323 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 51,314 psi | 80% | 3491 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 43% | 2123 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,775 psi | 73% | 3330 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,692 psi | 83% | 3448 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 46,746 psi | 73% | 3343 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 46,340 psi | 73% | 3310 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 46,876 psi | 73% | 3425 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 50,299 psi | 79% | 3389 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 48,718 psi | 76% | 3369 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 33,924 psi | 53% | 3002 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 47,152 psi | 74% | 3369 fps | 97% |
| Norma 217 | <<locked>> | 96% | 38,725 psi | 61% | 3251 fps | 96% |
| Norma MRP | <<locked>> | 80% | 38,943 psi | 61% | 3238 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 48,153 psi | 75% | 3396 fps | 99.9% |
| Ramshot Grand | 103.8 gr | 86% | 43,714 psi | 69% | 3356 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 47,094 psi | 74% | 3383 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 39,291 psi | 62% | 3202 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 44% | 2172 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,632 psi | 78% | 3432 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,848 psi | 75% | 3448 fps | 99.8% |
| ReloadSwiss RS 76 | 107.9 gr | 86% | 36,709 psi | 58% | 3212 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 49,124 psi | 77% | 3484 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 82% | 45,165 psi | 71% | 3294 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 40,422 psi | 63% | 3222 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 51,387 psi | 81% | 3419 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,299 psi | 79% | 3389 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 48,718 psi | 76% | 3369 fps | 98.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,298 psi | 77% | 3320 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,089 psi | 63% | 3215 fps | 95.1% |
| Somchem S361 | <<locked>> | 82% | 46,398 psi | 73% | 3278 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 45,382 psi | 71% | 3340 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,017 psi | 64% | 3202 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 53,490 psi | 84% | 3392 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,545 psi | 78% | 3386 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 38,101 psi | 60% | 3110 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,023 psi | 77% | 3389 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 39,885 psi | 63% | 3222 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 86% | 48,428 psi | 76% | 3458 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 90% | 45,803 psi | 72% | 3366 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 96% | 49,937 psi | 78% | 3497 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,139 psi | 77% | 3330 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,039 psi | 80% | 3471 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,097 psi | 50% | 3130 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 40,408 psi | 63% | 3179 fps | 95.2% |
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 70 powders for .30-378 Weath. Mag. loaded with the .308 | 125gr | Hornady SST. Hodgdon Retumbo delivers the highest muzzle velocity at 3,727 fps; across all powders the maximum-charge window runs from 2,362 fps to 3,727 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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. Hodgdon Retumbo, ReloadSwiss RS 76, Ramshot Grand rank at the top here: for .30-378 Weath. Mag. with the .308 | 125gr | Hornady SST 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.