Load Specifications
Load data in caliber .30-378 Weath. Mag. with .310 | 125gr | Speer HP TNT 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, Winchester StaBALL HD and IMR 7828 SSC.
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>> | 92% | 56,797 psi | 89% | 3507 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,188 psi | 90% | 3556 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,549 psi | 85% | 3602 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 90% | 55,666 psi | 87% | 3602 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 88% | 54,549 psi | 85% | 3547 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 92% | 56,536 psi | 89% | 3612 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 3563 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,617 psi | 78% | 3510 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,752 psi | 86% | 3543 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,375 psi | 85% | 3560 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,128 psi | 85% | 3530 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,797 psi | 89% | 3609 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,505 psi | 85% | 3524 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,331 psi | 85% | 3583 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,158 psi | 86% | 3612 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 55,970 psi | 88% | 3589 fps | 99% |
| Bofors RP30 | <<locked>> | 98% | 54,331 psi | 85% | 3573 fps | 98.3% |
| Bofors RP5 | <<locked>> | 92% | 56,797 psi | 89% | 3609 fps | 99.2% |
| Bofors RP7 | <<locked>> | 82% | 55,114 psi | 86% | 3491 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 98% | 56,579 psi | 89% | 3599 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 82% | 54,940 psi | 86% | 3543 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 82% | 57,145 psi | 90% | 3563 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 90% | 56,028 psi | 88% | 3540 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,911 psi | 86% | 3520 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,694 psi | 86% | 3471 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,116 psi | 90% | 3734 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 82% | 55,970 psi | 88% | 3579 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 58% | 2365 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,188 psi | 90% | 3533 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,449 psi | 88% | 3517 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 57,537 psi | 90% | 3543 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,753 psi | 89% | 3524 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 92% | 54,520 psi | 85% | 3586 fps | 97.9% |
| Lovex S065 | <<locked>> | 84% | 57,435 psi | 90% | 3520 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,869 psi | 88% | 3514 fps | 99.7% |
| Lovex S071 | <<locked>> | 96% | 54,520 psi | 85% | 3468 fps | 99.9% |
| Norma 204 | <<locked>> | 84% | 54,810 psi | 86% | 3527 fps | 98.6% |
| Norma 217ᴾ | <<locked>> | 100% | 45,310 psi | 71% | 3415 fps | 98.2% |
| Norma MRP | <<locked>> | 90% | 56,971 psi | 89% | 3635 fps | 99.8% |
| Norma URP | <<locked>> | 84% | 55,492 psi | 87% | 3533 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,492 psi | 87% | 3609 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 84% | 54,592 psi | 86% | 3530 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 94% | 54,346 psi | 85% | 3527 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,927 psi | 59% | 2418 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,653 psi | 90% | 3576 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,144 psi | 88% | 3602 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,404 psi | 85% | 3648 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 53,896 psi | 84% | 3583 fps | 97% |
| Rottweil R 904 | <<locked>> | 88% | 55,448 psi | 87% | 3510 fps | 98% |
| Rottweil R 905 | <<locked>> | 90% | 57,508 psi | 90% | 3589 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 82% | 55,114 psi | 86% | 3491 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,435 psi | 90% | 3520 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,869 psi | 88% | 3514 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,797 psi | 89% | 3461 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,087 psi | 89% | 3583 fps | 99.2% |
| Somchem S361 | <<locked>> | 88% | 57,392 psi | 90% | 3497 fps | 97.8% |
| Somchem S365 | <<locked>> | 86% | 56,391 psi | 88% | 3537 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,331 psi | 85% | 3488 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 82% | 57,377 psi | 90% | 3455 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,072 psi | 89% | 3524 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,099 psi | 85% | 3461 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 84% | 56,507 psi | 89% | 3527 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,405 psi | 88% | 3556 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,492 psi | 89% | 3625 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 96% | 57,174 psi | 90% | 3599 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 98% | 54,476 psi | 85% | 3589 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,000 psi | 89% | 3465 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,114 psi | 86% | 3550 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,653 psi | 90% | 3675 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,273 psi | 85% | 3474 fps | 98.7% |
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% | 37,333 psi | 59% | 3094 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 49,690 psi | 78% | 3419 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 43,947 psi | 69% | 3366 fps | 95% |
| Accurate MAGPRO | <<locked>> | 86% | 48,211 psi | 76% | 3445 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 41,249 psi | 65% | 3251 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 45,701 psi | 72% | 3386 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 94% | 44,512 psi | 70% | 3337 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 35,114 psi | 55% | 3130 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,713 psi | 65% | 3255 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,398 psi | 74% | 3425 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,336 psi | 65% | 3245 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 40,016 psi | 63% | 3238 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,897 psi | 56% | 3130 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 33,373 psi | 52% | 3081 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,277 psi | 63% | 3294 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 42,656 psi | 67% | 3304 fps | 95.8% |
| Bofors RP30 | <<locked>> | 92% | 43,859 psi | 69% | 3346 fps | 95.6% |
| Bofors RP5 | <<locked>> | 82% | 40,016 psi | 63% | 3238 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 51,663 psi | 81% | 3422 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 90% | 42,424 psi | 66% | 3291 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 51,314 psi | 80% | 3474 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 53,577 psi | 84% | 3494 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 48,689 psi | 76% | 3392 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 47,877 psi | 75% | 3373 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,701 psi | 70% | 3284 fps | 100% |
| Hodgdon Retumbo | 103.9 gr | 88% | 40,103 psi | 63% | 3330 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 51,721 psi | 81% | 3497 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 44% | 2129 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,036 psi | 74% | 3333 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,982 psi | 83% | 3451 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 47,065 psi | 74% | 3346 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 46,717 psi | 73% | 3320 fps | 95.4% |
| IMR 7828 SSC | 101.4 gr | 86% | 43,990 psi | 69% | 3356 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 50,604 psi | 79% | 3392 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 48,994 psi | 77% | 3376 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 34,316 psi | 54% | 3012 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 47,572 psi | 75% | 3379 fps | 97.2% |
| Norma 217 | <<locked>> | 94% | 36,506 psi | 57% | 3189 fps | 95% |
| Norma MRP | <<locked>> | 80% | 39,320 psi | 62% | 3248 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 48,428 psi | 76% | 3399 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 44,150 psi | 69% | 3366 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 47,529 psi | 74% | 3389 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 39,769 psi | 62% | 3212 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 45% | 2178 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,893 psi | 78% | 3435 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,298 psi | 76% | 3458 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 37,130 psi | 58% | 3225 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 49,792 psi | 78% | 3497 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 82% | 45,411 psi | 71% | 3304 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 40,727 psi | 64% | 3228 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 51,663 psi | 81% | 3422 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,604 psi | 79% | 3392 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 48,994 psi | 77% | 3376 fps | 99% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,516 psi | 78% | 3323 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,379 psi | 63% | 3222 fps | 95.3% |
| Somchem S361 | <<locked>> | 82% | 46,731 psi | 73% | 3284 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 45,716 psi | 72% | 3346 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,423 psi | 65% | 3212 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 53,809 psi | 84% | 3396 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,864 psi | 78% | 3396 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 38,450 psi | 60% | 3120 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 49,443 psi | 77% | 3396 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 40,190 psi | 63% | 3228 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 48,979 psi | 77% | 3468 fps | 96% |
| Vihtavuori N565 | <<locked>> | 90% | 46,311 psi | 73% | 3376 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 50,502 psi | 79% | 3507 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,516 psi | 78% | 3340 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,445 psi | 81% | 3478 fps | 99.2% |
| Winchester StaBALL HD | 97 gr | 80% | 32,561 psi | 51% | 3143 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 40,799 psi | 64% | 3189 fps | 95.4% |
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 .310 | 125gr | Speer HP TNT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,734 fps; across all powders the maximum-charge window runs from 2,365 fps to 3,734 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. ADI AR 2217, 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. Hodgdon Retumbo, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .30-378 Weath. Mag. with the .310 | 125gr | Speer HP TNT 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.