Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 115gr | AERO SB,- smax:10.90 bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand and Accurate High Country.
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>> | 94% | 55,825 psi | 87% | 3596 fps | 99.8% |
| Accurate 4350 | <<locked>> | 86% | 56,449 psi | 88% | 3655 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 53,679 psi | 84% | 3688 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 57,087 psi | 89% | 3629 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 54,070 psi | 85% | 3642 fps | 98% |
| ADI AR 2213 | <<locked>> | 94% | 56,043 psi | 88% | 3707 fps | 97.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 3563 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,005 psi | 71% | 3497 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,360 psi | 85% | 3635 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,450 psi | 90% | 3727 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,868 psi | 86% | 3675 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,377 psi | 90% | 3694 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,057 psi | 88% | 3701 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,246 psi | 90% | 3681 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3740 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,925 psi | 85% | 3701 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,056 psi | 86% | 3675 fps | 98.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 3648 fps | 97.4% |
| Bofors RP5 | <<locked>> | 94% | 56,057 psi | 88% | 3701 fps | 98.6% |
| Bofors RP7 | <<locked>> | 84% | 54,911 psi | 86% | 3593 fps | 98.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3681 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 54,491 psi | 85% | 3645 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 84% | 57,072 psi | 89% | 3668 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 92% | 55,753 psi | 87% | 3635 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,592 psi | 86% | 3612 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,070 psi | 85% | 3573 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3812 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 84% | 55,521 psi | 87% | 3675 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 58% | 2444 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,101 psi | 89% | 3638 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,623 psi | 89% | 3629 fps | 99.3% |
| IMR 4831 | <<locked>> | 88% | 57,014 psi | 89% | 3645 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,507 psi | 89% | 3619 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 94% | 53,664 psi | 84% | 3671 fps | 97% |
| Lovex S065 | <<locked>> | 86% | 57,174 psi | 90% | 3622 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 55,390 psi | 87% | 3609 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3612 fps | 99.8% |
| Norma 204 | <<locked>> | 86% | 54,563 psi | 86% | 3625 fps | 98% |
| Norma MRP | <<locked>> | 92% | 55,970 psi | 88% | 3724 fps | 99.4% |
| Norma URP | <<locked>> | 86% | 54,897 psi | 86% | 3635 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,563 psi | 86% | 3691 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 86% | 54,099 psi | 85% | 3629 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 96% | 53,272 psi | 83% | 3606 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 59% | 2500 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,884 psi | 89% | 3671 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,608 psi | 87% | 3707 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 53,301 psi | 84% | 3727 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 82% | 55,985 psi | 88% | 3602 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,158 psi | 86% | 3606 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 92% | 56,840 psi | 89% | 3681 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 84% | 54,911 psi | 86% | 3593 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,174 psi | 90% | 3622 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 55,390 psi | 87% | 3609 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,941 psi | 88% | 3471 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,594 psi | 89% | 3563 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,405 psi | 88% | 3675 fps | 98.5% |
| Somchem S355 | <<locked>> | 82% | 55,709 psi | 87% | 3599 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,116 psi | 90% | 3586 fps | 97.1% |
| Somchem S365 | <<locked>> | 88% | 55,579 psi | 87% | 3638 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,406 psi | 90% | 3648 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 84% | 57,334 psi | 90% | 3566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,768 psi | 89% | 3629 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,276 psi | 90% | 3619 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 86% | 56,086 psi | 88% | 3629 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,187 psi | 86% | 3645 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,724 psi | 87% | 3714 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 98% | 55,985 psi | 88% | 3681 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,869 psi | 89% | 3570 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,679 psi | 86% | 3648 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,738 psi | 87% | 3763 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,809 psi | 84% | 3570 fps | 98.1% |
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>> | 82% | 36,100 psi | 57% | 3153 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 45,281 psi | 71% | 3432 fps | 99.3% |
| Accurate High Country | 107.6 gr | 88% | 49,763 psi | 78% | 3606 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 53,461 psi | 84% | 3563 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 43,700 psi | 68% | 3412 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 90% | 48,399 psi | 76% | 3547 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 98% | 46,876 psi | 73% | 3484 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 39,102 psi | 61% | 3333 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 44,063 psi | 69% | 3409 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,482 psi | 68% | 3448 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,836 psi | 80% | 3599 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 43,584 psi | 68% | 3399 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 45,107 psi | 71% | 3468 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,256 psi | 51% | 3120 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 86% | 34,650 psi | 54% | 3209 fps | 95.7% |
| Alliant Reloder-26 | 100.8 gr | 80% | 35,853 psi | 56% | 3271 fps | 96.8% |
| Bofors RP15 | <<locked>> | 90% | 44,599 psi | 70% | 3451 fps | 95.6% |
| Bofors RP30 | <<locked>> | 96% | 45,759 psi | 72% | 3491 fps | 95.4% |
| Bofors RP5 | <<locked>> | 88% | 45,107 psi | 71% | 3468 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 48,080 psi | 75% | 3451 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 94% | 44,759 psi | 70% | 3438 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 47,326 psi | 74% | 3494 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 49,864 psi | 78% | 3524 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 51,866 psi | 81% | 3556 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 50,763 psi | 80% | 3530 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,901 psi | 64% | 3304 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 92% | 41,901 psi | 66% | 3471 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 47,456 psi | 74% | 3507 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 43% | 2201 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,627 psi | 68% | 3353 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,603 psi | 78% | 3488 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 43,105 psi | 68% | 3363 fps | 99% |
| IMR 4955 Enduron | <<locked>> | 88% | 49,603 psi | 78% | 3481 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 49,980 psi | 78% | 3589 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 46,978 psi | 74% | 3422 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 45,310 psi | 71% | 3399 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 35,215 psi | 55% | 3130 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 43,888 psi | 69% | 3389 fps | 95.2% |
| Norma MRP | <<locked>> | 84% | 41,321 psi | 65% | 3396 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 44,541 psi | 70% | 3422 fps | 99.2% |
| Ramshot Grand | 109.1 gr | 90% | 46,615 psi | 73% | 3520 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 43,671 psi | 68% | 3402 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 90% | 41,858 psi | 66% | 3356 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,905 psi | 44% | 2251 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,614 psi | 71% | 3448 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,135 psi | 69% | 3468 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 38,928 psi | 61% | 3363 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 52,315 psi | 82% | 3540 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 48,225 psi | 76% | 3461 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 42,844 psi | 67% | 3379 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,080 psi | 75% | 3451 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,978 psi | 74% | 3422 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 80% | 45,310 psi | 71% | 3399 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,460 psi | 82% | 3415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,180 psi | 72% | 3353 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,496 psi | 67% | 3373 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 52,156 psi | 82% | 3533 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,792 psi | 78% | 3445 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 41,495 psi | 65% | 3366 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 40,451 psi | 63% | 3281 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 49,995 psi | 78% | 3442 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,006 psi | 72% | 3422 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 86% | 40,364 psi | 63% | 3261 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 45,600 psi | 71% | 3419 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 36,129 psi | 57% | 3219 fps | 97.6% |
| Vihtavuori N560 | <<locked>> | 90% | 51,851 psi | 81% | 3632 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 94% | 48,312 psi | 76% | 3517 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,730 psi | 72% | 3369 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,500 psi | 74% | 3497 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,703 psi | 45% | 3094 fps | 97.1% |
| Winchester Supreme 780 | <<locked>> | 86% | 43,134 psi | 68% | 3337 fps | 95.3% |
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 71 powders for .30-378 Weath. Mag. loaded with the .308 | 115gr | AERO SB,- smax:10.90. Hodgdon Retumbo delivers the highest muzzle velocity at 3,812 fps; across all powders the maximum-charge window runs from 2,444 fps to 3,812 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 115.0 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, Alliant Reloder-25 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. Alliant Reloder-26, Ramshot Grand, Accurate High Country rank at the top here: for .30-378 Weath. Mag. with the .308 | 115gr | AERO SB,- smax:10.90 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.