Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 115gr | Sierra VarmintKing bullet and 72 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 57,305 psi | 90% | 3619 fps | 99.9% |
| Accurate 4350 | <<locked>> | 84% | 53,925 psi | 85% | 3606 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,940 psi | 86% | 3711 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 92% | 56,246 psi | 88% | 3711 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 90% | 55,013 psi | 86% | 3658 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 94% | 57,087 psi | 89% | 3727 fps | 97.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,605 psi | 81% | 3586 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,311 psi | 73% | 3527 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,766 psi | 86% | 3681 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,970 psi | 88% | 3691 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,723 psi | 86% | 3642 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,246 psi | 90% | 3720 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,621 psi | 86% | 3635 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,462 psi | 85% | 3691 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,332 psi | 87% | 3720 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,202 psi | 88% | 3698 fps | 98.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 3671 fps | 97.7% |
| Bofors RP5 | <<locked>> | 94% | 57,246 psi | 90% | 3720 fps | 98.7% |
| Bofors RP7 | <<locked>> | 84% | 56,072 psi | 88% | 3612 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3707 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 84% | 55,709 psi | 87% | 3665 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 82% | 54,375 psi | 85% | 3615 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 92% | 56,739 psi | 89% | 3652 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,593 psi | 87% | 3629 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,158 psi | 86% | 3589 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3839 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 84% | 56,753 psi | 89% | 3698 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 58% | 2448 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,404 psi | 85% | 3586 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,450 psi | 90% | 3642 fps | 99.4% |
| IMR 4831 | <<locked>> | 86% | 54,476 psi | 85% | 3596 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,580 psi | 90% | 3635 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 94% | 54,926 psi | 86% | 3694 fps | 97.3% |
| Lovex S065 | <<locked>> | 84% | 54,781 psi | 86% | 3576 fps | 99.8% |
| Lovex S070 | <<locked>> | 86% | 56,492 psi | 89% | 3625 fps | 99.5% |
| Lovex S071 | <<locked>> | 98% | 54,810 psi | 86% | 3573 fps | 99.7% |
| Norma 204 | <<locked>> | 86% | 55,535 psi | 87% | 3642 fps | 98.1% |
| Norma 217ᴾ | <<locked>> | 100% | 41,858 psi | 66% | 3425 fps | 96.4% |
| Norma MRP | <<locked>> | 92% | 57,217 psi | 90% | 3747 fps | 99.5% |
| Norma URP | <<locked>> | 86% | 55,985 psi | 88% | 3655 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,767 psi | 87% | 3714 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 86% | 55,158 psi | 86% | 3648 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 96% | 54,752 psi | 86% | 3632 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2500 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,215 psi | 85% | 3622 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,695 psi | 89% | 3727 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,578 psi | 86% | 3750 fps | 99.8% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 3681 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 82% | 57,406 psi | 90% | 3622 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,086 psi | 88% | 3622 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 90% | 54,143 psi | 85% | 3625 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 84% | 56,072 psi | 88% | 3612 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,781 psi | 86% | 3576 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 56,492 psi | 89% | 3625 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,782 psi | 89% | 3481 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,027 psi | 85% | 3514 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,508 psi | 90% | 3694 fps | 98.7% |
| Somchem S355 | <<locked>> | 82% | 57,014 psi | 89% | 3619 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,418 psi | 85% | 3533 fps | 96.5% |
| Somchem S365 | <<locked>> | 88% | 56,782 psi | 89% | 3655 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,882 psi | 86% | 3599 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,694 psi | 86% | 3520 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,099 psi | 85% | 3579 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,592 psi | 86% | 3570 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 86% | 57,217 psi | 90% | 3645 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,724 psi | 89% | 3671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,855 psi | 89% | 3730 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 98% | 57,363 psi | 90% | 3701 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,027 psi | 85% | 3520 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,912 psi | 88% | 3668 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,246 psi | 90% | 3783 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,911 psi | 86% | 3586 fps | 98.3% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 34,954 psi | 55% | 3120 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 46,760 psi | 73% | 3461 fps | 99.5% |
| Accurate High Country | <<locked>> | 86% | 47,442 psi | 74% | 3547 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 90% | 52,199 psi | 82% | 3629 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 84% | 44,773 psi | 70% | 3435 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 49,574 psi | 78% | 3570 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 47,964 psi | 75% | 3507 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 37,623 psi | 59% | 3291 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,599 psi | 70% | 3471 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,098 psi | 82% | 3622 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 44,715 psi | 70% | 3425 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 43,178 psi | 68% | 3415 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,489 psi | 52% | 3159 fps | 98.1% |
| Alliant Reloder-25 | <<locked>> | 84% | 33,504 psi | 53% | 3169 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,130 psi | 58% | 3310 fps | 97.4% |
| Bofors RP15 | <<locked>> | 88% | 42,844 psi | 67% | 3406 fps | 95% |
| Bofors RP30 | <<locked>> | 96% | 47,036 psi | 74% | 3517 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 43,178 psi | 68% | 3415 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 49,226 psi | 77% | 3474 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 94% | 45,948 psi | 72% | 3465 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 48,530 psi | 76% | 3520 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 50,792 psi | 80% | 3540 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 88% | 49,385 psi | 77% | 3501 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 90% | 51,909 psi | 81% | 3556 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,105 psi | 66% | 3330 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 43,149 psi | 68% | 3507 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 48,660 psi | 76% | 3533 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 2205 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,672 psi | 70% | 3376 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,604 psi | 79% | 3504 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 44,411 psi | 70% | 3392 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 50,502 psi | 79% | 3497 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 90% | 47,601 psi | 75% | 3533 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 48,153 psi | 75% | 3442 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 46,528 psi | 73% | 3422 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 36,695 psi | 57% | 3169 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 44,991 psi | 71% | 3412 fps | 95.5% |
| Norma 217 | <<locked>> | 98% | 38,827 psi | 61% | 3343 fps | 95.1% |
| Norma MRP | <<locked>> | 82% | 39,479 psi | 62% | 3346 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 45,774 psi | 72% | 3448 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 47,906 psi | 75% | 3547 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 44,860 psi | 70% | 3428 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 88% | 39,972 psi | 63% | 3310 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 44% | 2254 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,978 psi | 74% | 3481 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,194 psi | 71% | 3494 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 40,132 psi | 63% | 3399 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 49,719 psi | 78% | 3589 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 53,722 psi | 84% | 3563 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 49,168 psi | 77% | 3481 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 84% | 43,961 psi | 69% | 3406 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 49,226 psi | 77% | 3474 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,153 psi | 75% | 3442 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 46,528 psi | 73% | 3422 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,345 psi | 84% | 3425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,224 psi | 74% | 3373 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 43,598 psi | 68% | 3396 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 53,417 psi | 84% | 3556 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 50,807 psi | 80% | 3461 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 42,801 psi | 67% | 3392 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 41,727 psi | 65% | 3310 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 51,184 psi | 80% | 3458 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,210 psi | 74% | 3445 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 41,452 psi | 65% | 3287 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 46,673 psi | 73% | 3438 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 37,565 psi | 59% | 3258 fps | 98.1% |
| Vihtavuori N560 | <<locked>> | 88% | 49,342 psi | 77% | 3576 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 49,763 psi | 78% | 3550 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,688 psi | 73% | 3389 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,675 psi | 76% | 3520 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,936 psi | 47% | 3140 fps | 97.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 44,237 psi | 69% | 3360 fps | 95.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 78 powders for .30-378 Weath. Mag. loaded with the .308 | 115gr | Sierra VarmintKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,839 fps; across all powders the maximum-charge window runs from 2,448 fps to 3,839 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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-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, Baschieri & Pellagri 109, IMR 8133 Enduron 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.