Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 125gr | Barnes Solid bullet and 69 powders. The key underlying parameters are shown in the table above.
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% | 55,738 psi | 87% | 3491 fps | 99.9% |
| Accurate 4350 | <<locked>> | 84% | 56,246 psi | 88% | 3540 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,406 psi | 90% | 3661 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 90% | 54,476 psi | 85% | 3583 fps | 96.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,276 psi | 90% | 3596 fps | 99% |
| ADI AR 2213 | <<locked>> | 92% | 55,463 psi | 87% | 3596 fps | 97.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,766 psi | 84% | 3543 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,443 psi | 76% | 3488 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,101 psi | 89% | 3609 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,855 psi | 89% | 3579 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,753 psi | 87% | 3593 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,971 psi | 89% | 3566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,942 psi | 89% | 3632 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 53,780 psi | 84% | 3589 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 54,766 psi | 86% | 3570 fps | 98.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 3625 fps | 98.7% |
| Bofors RP5 | <<locked>> | 92% | 55,753 psi | 87% | 3593 fps | 99% |
| Bofors RP7 | <<locked>> | 82% | 54,317 psi | 85% | 3474 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 98% | 55,317 psi | 87% | 3576 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 53,969 psi | 85% | 3527 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 82% | 56,318 psi | 88% | 3550 fps | 99% |
| Hodgdon H4831 | <<locked>> | 90% | 55,042 psi | 86% | 3520 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 53,911 psi | 84% | 3501 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,464 psi | 90% | 3517 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,695 psi | 87% | 3707 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 82% | 54,723 psi | 86% | 3556 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 58% | 2359 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,304 psi | 88% | 3517 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,651 psi | 87% | 3504 fps | 99.6% |
| IMR 4831 | <<locked>> | 86% | 56,521 psi | 89% | 3527 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,796 psi | 87% | 3507 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 94% | 57,319 psi | 90% | 3642 fps | 98.4% |
| Lovex S065 | <<locked>> | 84% | 56,492 psi | 89% | 3501 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,897 psi | 86% | 3494 fps | 99.6% |
| Lovex S071 | <<locked>> | 98% | 57,072 psi | 89% | 3514 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,667 psi | 90% | 3579 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 44,121 psi | 69% | 3396 fps | 97.9% |
| Norma MRP | <<locked>> | 90% | 55,666 psi | 87% | 3612 fps | 99.7% |
| Norma URP | <<locked>> | 84% | 54,462 psi | 85% | 3517 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,230 psi | 85% | 3586 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 86% | 57,334 psi | 90% | 3579 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,464 psi | 90% | 3583 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 2411 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,478 psi | 89% | 3560 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,955 psi | 86% | 3586 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,246 psi | 90% | 3704 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3638 fps | 97.5% |
| Rottweil R 904 | <<locked>> | 88% | 54,433 psi | 85% | 3491 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 90% | 56,391 psi | 88% | 3570 fps | 99% |
| Rottweil R 907 | <<locked>> | 82% | 54,317 psi | 85% | 3474 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,492 psi | 89% | 3501 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,897 psi | 86% | 3494 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,912 psi | 88% | 3445 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,970 psi | 88% | 3566 fps | 99% |
| Somchem S361 | <<locked>> | 88% | 56,347 psi | 88% | 3474 fps | 97.5% |
| Somchem S365 | <<locked>> | 86% | 55,303 psi | 87% | 3524 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,942 psi | 89% | 3537 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 82% | 56,565 psi | 89% | 3442 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,217 psi | 88% | 3510 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,768 psi | 89% | 3510 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 84% | 55,579 psi | 87% | 3514 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,405 psi | 87% | 3543 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,303 psi | 87% | 3602 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 96% | 55,811 psi | 87% | 3579 fps | 97.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3645 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,985 psi | 88% | 3451 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,114 psi | 85% | 3530 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,912 psi | 88% | 3652 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,116 psi | 90% | 3527 fps | 99% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 36,579 psi | 57% | 3077 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 48,776 psi | 76% | 3399 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 46,253 psi | 72% | 3425 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 88% | 50,720 psi | 79% | 3504 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 40,509 psi | 63% | 3235 fps | 95% |
| ADI AR 2213 | <<locked>> | 86% | 44,744 psi | 70% | 3363 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 43,526 psi | 68% | 3314 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 92% | 36,767 psi | 58% | 3182 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,470 psi | 73% | 3409 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,582 psi | 64% | 3228 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 42,090 psi | 66% | 3297 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,085 psi | 55% | 3110 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 32,648 psi | 51% | 3058 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,262 psi | 62% | 3274 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 41,785 psi | 65% | 3284 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 42,888 psi | 67% | 3330 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 42,090 psi | 66% | 3297 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 50,850 psi | 80% | 3409 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 90% | 41,553 psi | 65% | 3268 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 50,343 psi | 79% | 3455 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 52,634 psi | 82% | 3478 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 47,848 psi | 75% | 3373 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,876 psi | 73% | 3353 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,845 psi | 69% | 3268 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 39,218 psi | 61% | 3307 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 50,821 psi | 80% | 3481 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,673 psi | 43% | 2119 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,282 psi | 73% | 3317 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,199 psi | 82% | 3438 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 46,224 psi | 72% | 3333 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,905 psi | 72% | 3301 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 46,267 psi | 73% | 3412 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 49,792 psi | 78% | 3376 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 48,182 psi | 76% | 3360 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 33,547 psi | 53% | 2992 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 46,702 psi | 73% | 3360 fps | 96.8% |
| Norma 217 | <<locked>> | 96% | 38,145 psi | 60% | 3241 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 38,551 psi | 60% | 3232 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 47,587 psi | 75% | 3386 fps | 99.8% |
| Ramshot Grand | <<locked>> | 86% | 43,120 psi | 68% | 3343 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 46,572 psi | 73% | 3369 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 38,856 psi | 61% | 3192 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 2169 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,081 psi | 77% | 3422 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,311 psi | 74% | 3442 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 36,216 psi | 57% | 3196 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 48,385 psi | 76% | 3471 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 82% | 44,672 psi | 70% | 3284 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 39,929 psi | 63% | 3209 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 50,850 psi | 80% | 3409 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,792 psi | 78% | 3376 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 48,182 psi | 76% | 3360 fps | 98.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,805 psi | 76% | 3314 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 42,467 psi | 67% | 3278 fps | 95.9% |
| Somchem S361 | <<locked>> | 84% | 49,182 psi | 77% | 3337 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 44,788 psi | 70% | 3330 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,567 psi | 64% | 3192 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 52,953 psi | 83% | 3383 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,023 psi | 77% | 3379 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 40,466 psi | 63% | 3173 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 48,486 psi | 76% | 3379 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 39,320 psi | 62% | 3209 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 86% | 47,921 psi | 75% | 3448 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 45,194 psi | 71% | 3353 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 53,142 psi | 83% | 3566 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,660 psi | 76% | 3327 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,488 psi | 79% | 3458 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,517 psi | 49% | 3117 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,958 psi | 63% | 3169 fps | 95% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 74 powders for .30-378 Weath. Mag. loaded with the .308 | 125gr | Barnes Solid. Hodgdon Retumbo delivers the highest muzzle velocity at 3,707 fps; across all powders the maximum-charge window runs from 2,359 fps to 3,707 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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. As outliers, Alliant Reloder-33, Vihtavuori N170, Vihtavuori N570 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.