Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 125gr | Sierra MatchKing bullet and 70 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% | 54,781 psi | 86% | 3478 fps | 99.9% |
| Accurate 4350 | <<locked>> | 84% | 55,347 psi | 87% | 3527 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,376 psi | 88% | 3642 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 92% | 57,725 psi | 90% | 3645 fps | 97.3% |
| ADI AR 2209 | <<locked>> | 90% | 56,463 psi | 88% | 3583 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 92% | 54,505 psi | 85% | 3579 fps | 97.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 3520 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 3468 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,130 psi | 88% | 3593 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,508 psi | 90% | 3609 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,101 psi | 88% | 3570 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,781 psi | 86% | 3576 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,086 psi | 88% | 3556 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,956 psi | 88% | 3619 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,058 psi | 89% | 3648 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 57,653 psi | 90% | 3625 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3606 fps | 98.5% |
| Bofors RP5 | <<locked>> | 92% | 54,781 psi | 86% | 3576 fps | 98.8% |
| Bofors RP7 | <<locked>> | 84% | 57,145 psi | 90% | 3527 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 98% | 54,462 psi | 85% | 3560 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 84% | 56,985 psi | 89% | 3586 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 82% | 55,651 psi | 87% | 3537 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 90% | 54,157 psi | 85% | 3504 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,971 psi | 89% | 3556 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,565 psi | 89% | 3501 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,752 psi | 86% | 3694 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 82% | 53,940 psi | 85% | 3543 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,970 psi | 58% | 2352 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,666 psi | 87% | 3504 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,998 psi | 86% | 3491 fps | 99.5% |
| IMR 4831 | <<locked>> | 86% | 55,811 psi | 87% | 3517 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,056 psi | 86% | 3491 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 94% | 56,391 psi | 88% | 3622 fps | 98.1% |
| Lovex S065 | <<locked>> | 84% | 55,840 psi | 88% | 3494 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,259 psi | 85% | 3481 fps | 99.5% |
| Lovex S071 | <<locked>> | 98% | 56,101 psi | 88% | 3497 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 56,884 psi | 89% | 3566 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 43,120 psi | 68% | 3373 fps | 97.5% |
| Norma MRP | <<locked>> | 90% | 54,679 psi | 86% | 3599 fps | 99.5% |
| Norma URP | <<locked>> | 86% | 57,348 psi | 90% | 3570 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,508 psi | 90% | 3648 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 86% | 56,521 psi | 89% | 3566 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 96% | 56,333 psi | 88% | 3563 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,855 psi | 59% | 2408 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,608 psi | 87% | 3543 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,085 psi | 85% | 3573 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,173 psi | 88% | 3684 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3619 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 90% | 57,392 psi | 90% | 3547 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 90% | 55,579 psi | 87% | 3556 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 84% | 57,145 psi | 90% | 3527 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,840 psi | 88% | 3494 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,259 psi | 85% | 3481 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,114 psi | 86% | 3432 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,143 psi | 86% | 3550 fps | 98.8% |
| Somchem S361 | <<locked>> | 88% | 55,535 psi | 87% | 3461 fps | 97.3% |
| Somchem S365 | <<locked>> | 86% | 54,520 psi | 85% | 3510 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,173 psi | 88% | 3524 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 82% | 55,869 psi | 88% | 3432 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,347 psi | 87% | 3494 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,869 psi | 88% | 3494 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 84% | 54,752 psi | 86% | 3501 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,520 psi | 85% | 3530 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,346 psi | 85% | 3586 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 96% | 54,882 psi | 86% | 3563 fps | 97.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,985 psi | 88% | 3625 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,259 psi | 87% | 3438 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,130 psi | 90% | 3586 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,679 psi | 86% | 3638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,202 psi | 88% | 3510 fps | 98.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 36,071 psi | 57% | 3064 fps | 96.3% |
| Accurate 4350 | <<locked>> | 80% | 48,153 psi | 75% | 3392 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 45,426 psi | 71% | 3406 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 88% | 49,792 psi | 78% | 3484 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 82% | 42,772 psi | 67% | 3291 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 47,384 psi | 74% | 3425 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 96% | 45,890 psi | 72% | 3369 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 92% | 36,114 psi | 57% | 3163 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,847 psi | 72% | 3399 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,461 psi | 84% | 3537 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 42,801 psi | 67% | 3284 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 41,481 psi | 65% | 3281 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,519 psi | 54% | 3100 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 32,111 psi | 50% | 3041 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,464 psi | 60% | 3258 fps | 98.4% |
| Bofors RP15 | <<locked>> | 86% | 41,046 psi | 64% | 3268 fps | 95.1% |
| Bofors RP30 | <<locked>> | 94% | 45,121 psi | 71% | 3386 fps | 95.9% |
| Bofors RP5 | <<locked>> | 84% | 41,481 psi | 65% | 3281 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,343 psi | 79% | 3396 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 43,932 psi | 69% | 3330 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 49,661 psi | 78% | 3442 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 51,953 psi | 81% | 3461 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 86% | 47,137 psi | 74% | 3360 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 49,588 psi | 78% | 3412 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,236 psi | 68% | 3258 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 41,321 psi | 65% | 3369 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,024 psi | 78% | 3465 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 2116 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,803 psi | 72% | 3307 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,677 psi | 81% | 3428 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 45,643 psi | 72% | 3320 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 48,472 psi | 76% | 3360 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 88% | 45,513 psi | 71% | 3396 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 49,255 psi | 77% | 3366 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 47,645 psi | 75% | 3350 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 33,069 psi | 52% | 2976 fps | 95% |
| Norma 204 | <<locked>> | 80% | 46,021 psi | 72% | 3346 fps | 96.6% |
| Norma 217 | <<locked>> | 96% | 37,362 psi | 59% | 3219 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 37,753 psi | 59% | 3212 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 46,978 psi | 74% | 3373 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 45,759 psi | 72% | 3406 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 45,934 psi | 72% | 3356 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 86% | 38,072 psi | 60% | 3173 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 44% | 2165 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,211 psi | 76% | 3406 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,499 psi | 73% | 3422 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 38,290 psi | 60% | 3261 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,340 psi | 74% | 3451 fps | 95% |
| Rottweil R 904 | <<locked>> | 82% | 44,063 psi | 69% | 3271 fps | 95% |
| Rottweil R 905 | <<locked>> | 82% | 42,148 psi | 66% | 3268 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,343 psi | 79% | 3396 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,255 psi | 77% | 3366 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 47,645 psi | 75% | 3350 fps | 98.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,370 psi | 76% | 3301 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 41,814 psi | 66% | 3261 fps | 95.6% |
| Somchem S361 | <<locked>> | 84% | 48,559 psi | 76% | 3323 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 44,150 psi | 69% | 3317 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,943 psi | 63% | 3176 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 52,402 psi | 82% | 3376 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,472 psi | 76% | 3366 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 39,769 psi | 62% | 3156 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 47,834 psi | 75% | 3363 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 38,754 psi | 61% | 3196 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 86% | 47,166 psi | 74% | 3432 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 92% | 47,688 psi | 75% | 3415 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 52,112 psi | 82% | 3547 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,921 psi | 75% | 3314 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,792 psi | 78% | 3445 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,850 psi | 48% | 3097 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 84% | 42,279 psi | 66% | 3225 fps | 95.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 76 powders for .30-378 Weath. Mag. loaded with the .308 | 125gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,694 fps; across all powders the maximum-charge window runs from 2,352 fps to 3,694 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 1:12.0 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, IMR 7977 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.