Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 110gr | X-TREME RN bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, 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>> | 94% | 57,508 psi | 90% | 3671 fps | 99.8% |
| Accurate 4350 | <<locked>> | 84% | 54,027 psi | 85% | 3661 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,129 psi | 86% | 3763 fps | 97.1% |
| Accurate MAGPRO | <<locked>> | 92% | 56,449 psi | 88% | 3766 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 90% | 55,230 psi | 87% | 3714 fps | 98% |
| ADI AR 2213 | <<locked>> | 94% | 57,203 psi | 90% | 3776 fps | 97.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 3638 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,514 psi | 73% | 3573 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,853 psi | 86% | 3734 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,159 psi | 88% | 3747 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,839 psi | 86% | 3694 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,363 psi | 90% | 3773 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,882 psi | 86% | 3691 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,679 psi | 86% | 3743 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,593 psi | 87% | 3776 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,521 psi | 89% | 3753 fps | 98.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3720 fps | 97.5% |
| Bofors RP5 | <<locked>> | 94% | 57,363 psi | 90% | 3773 fps | 98.6% |
| Bofors RP7 | <<locked>> | 84% | 56,086 psi | 88% | 3668 fps | 98.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 3757 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,724 psi | 87% | 3714 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 82% | 54,462 psi | 85% | 3668 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 92% | 56,913 psi | 89% | 3704 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,825 psi | 87% | 3684 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,187 psi | 86% | 3642 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,508 psi | 90% | 3891 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 84% | 57,000 psi | 89% | 3750 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 58% | 2500 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,462 psi | 85% | 3635 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,595 psi | 90% | 3698 fps | 99.3% |
| IMR 4831 | <<locked>> | 86% | 54,491 psi | 85% | 3652 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,667 psi | 90% | 3691 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 94% | 55,071 psi | 86% | 3743 fps | 97.1% |
| Lovex S065 | <<locked>> | 84% | 54,766 psi | 86% | 3632 fps | 99.7% |
| Lovex S070 | <<locked>> | 86% | 56,710 psi | 89% | 3684 fps | 99.4% |
| Lovex S071 | <<locked>> | 98% | 54,868 psi | 86% | 3625 fps | 99.6% |
| Norma 204 | <<locked>> | 86% | 55,753 psi | 87% | 3698 fps | 98% |
| Norma MRP | <<locked>> | 92% | 57,508 psi | 90% | 3799 fps | 99.4% |
| Norma URP | <<locked>> | 86% | 56,217 psi | 88% | 3707 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,985 psi | 88% | 3763 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 86% | 55,347 psi | 87% | 3701 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 96% | 54,969 psi | 86% | 3684 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2556 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,346 psi | 85% | 3678 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,797 psi | 89% | 3776 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,998 psi | 86% | 3806 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 82% | 57,450 psi | 90% | 3681 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,333 psi | 88% | 3678 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 90% | 54,346 psi | 85% | 3684 fps | 98% |
| Rottweil R 907 | <<locked>> | 84% | 56,086 psi | 88% | 3668 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,766 psi | 86% | 3632 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 56,710 psi | 89% | 3684 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,826 psi | 89% | 3537 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,114 psi | 85% | 3566 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 53,925 psi | 85% | 3675 fps | 97.9% |
| Somchem S355 | <<locked>> | 82% | 56,913 psi | 89% | 3675 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,578 psi | 86% | 3583 fps | 96.3% |
| Somchem S365 | <<locked>> | 88% | 56,898 psi | 89% | 3711 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,013 psi | 86% | 3652 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 82% | 54,737 psi | 86% | 3576 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,186 psi | 85% | 3635 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,752 psi | 86% | 3619 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 86% | 57,305 psi | 90% | 3701 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,753 psi | 89% | 3724 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,145 psi | 90% | 3786 fps | 97% |
| Vihtavuori N565 | <<locked>> | 98% | 57,624 psi | 90% | 3757 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,186 psi | 85% | 3576 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,869 psi | 88% | 3720 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,653 psi | 90% | 3842 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,085 psi | 86% | 3638 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% | 37,637 psi | 59% | 3238 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 46,862 psi | 73% | 3517 fps | 99.4% |
| Accurate High Country | 107.9 gr | 86% | 47,630 psi | 75% | 3596 fps | 95% |
| Accurate MAGPRO | <<locked>> | 90% | 52,330 psi | 82% | 3678 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 84% | 44,744 psi | 70% | 3484 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 90% | 49,676 psi | 78% | 3619 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 98% | 48,153 psi | 75% | 3556 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 96% | 40,393 psi | 63% | 3409 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,614 psi | 70% | 3524 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,199 psi | 82% | 3678 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 44,788 psi | 70% | 3474 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 43,308 psi | 68% | 3465 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,489 psi | 52% | 3199 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 35,882 psi | 56% | 3287 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,289 psi | 58% | 3356 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 45,919 psi | 72% | 3524 fps | 95.7% |
| Bofors RP30 | <<locked>> | 96% | 47,253 psi | 74% | 3566 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 43,308 psi | 68% | 3465 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 49,226 psi | 77% | 3527 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 94% | 46,050 psi | 72% | 3514 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,530 psi | 76% | 3570 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 50,836 psi | 80% | 3596 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 53,113 psi | 83% | 3625 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 52,054 psi | 82% | 3606 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,989 psi | 66% | 3376 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 92% | 43,192 psi | 68% | 3553 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 48,733 psi | 76% | 3586 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 43% | 2254 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,773 psi | 70% | 3425 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,560 psi | 79% | 3556 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 44,382 psi | 70% | 3442 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 88% | 50,604 psi | 79% | 3547 fps | 95.4% |
| IMR 7828 SSC | 108.7 gr | 90% | 47,732 psi | 75% | 3586 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 48,153 psi | 75% | 3494 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 46,499 psi | 73% | 3471 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 36,753 psi | 58% | 3212 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 44,976 psi | 70% | 3465 fps | 95.3% |
| Norma MRP | <<locked>> | 82% | 39,653 psi | 62% | 3396 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 45,745 psi | 72% | 3497 fps | 99.2% |
| Ramshot Grand | <<locked>> | 90% | 48,080 psi | 75% | 3596 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,846 psi | 70% | 3478 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 43,337 psi | 68% | 3435 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 44% | 2306 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,050 psi | 74% | 3530 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,237 psi | 71% | 3543 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 40,277 psi | 63% | 3442 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 53,664 psi | 84% | 3615 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 49,226 psi | 77% | 3533 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 44,034 psi | 69% | 3455 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 49,226 psi | 77% | 3527 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,153 psi | 75% | 3494 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,499 psi | 73% | 3471 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,287 psi | 84% | 3481 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,297 psi | 74% | 3425 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 43,714 psi | 69% | 3448 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 53,417 psi | 84% | 3609 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 50,879 psi | 80% | 3507 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 42,873 psi | 67% | 3442 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 41,829 psi | 66% | 3360 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 51,184 psi | 80% | 3514 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,253 psi | 74% | 3497 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 86% | 41,597 psi | 65% | 3333 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 46,862 psi | 73% | 3491 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 37,565 psi | 59% | 3304 fps | 97.9% |
| Vihtavuori N560 | <<locked>> | 90% | 53,171 psi | 83% | 3704 fps | 96% |
| Vihtavuori N565 | <<locked>> | 94% | 50,009 psi | 78% | 3599 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,862 psi | 73% | 3442 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,660 psi | 76% | 3570 fps | 98% |
| Winchester StaBALL HD | 99.3 gr | 80% | 29,950 psi | 47% | 3182 fps | 97.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 44,309 psi | 69% | 3409 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 77 powders for .30-378 Weath. Mag. loaded with the .308 | 110gr | X-TREME RN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,891 fps; across all powders the maximum-charge window runs from 2,500 fps to 3,891 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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, 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. Accurate High Country, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .30-378 Weath. Mag. with the .308 | 110gr | X-TREME RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, Vihtavuori N170 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.