Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 135gr | Sierra HPBT MatchKing bullet and 67 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>> | 90% | 56,057 psi | 88% | 3399 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,304 psi | 88% | 3442 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 53,882 psi | 84% | 3497 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 88% | 54,882 psi | 86% | 3497 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 88% | 57,421 psi | 90% | 3507 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 90% | 55,622 psi | 87% | 3504 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 98% | 54,201 psi | 85% | 3465 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3488 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,290 psi | 90% | 3507 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,898 psi | 89% | 3488 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,985 psi | 88% | 3501 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,696 psi | 90% | 3474 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 53,983 psi | 85% | 3478 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,491 psi | 85% | 3497 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 3547 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,768 psi | 89% | 3451 fps | 96.5% |
| Bofors RP15 | <<locked>> | 92% | 55,376 psi | 87% | 3488 fps | 99.3% |
| Bofors RP30 | <<locked>> | 96% | 53,809 psi | 84% | 3474 fps | 98.8% |
| Bofors RP5 | <<locked>> | 90% | 55,985 psi | 88% | 3501 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 57,508 psi | 90% | 3442 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 55,753 psi | 87% | 3494 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 57,711 psi | 90% | 3497 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,969 psi | 86% | 3428 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,027 psi | 85% | 3412 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,522 psi | 90% | 3412 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,652 psi | 89% | 3629 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 59% | 2290 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,101 psi | 88% | 3422 fps | 99.8% |
| IMR 4831 | <<locked>> | 84% | 56,637 psi | 89% | 3428 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,666 psi | 87% | 3415 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 90% | 53,751 psi | 84% | 3478 fps | 98.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,138 psi | 75% | 3373 fps | 97.6% |
| Lovex S065 | <<locked>> | 82% | 56,275 psi | 88% | 3402 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,665 psi | 86% | 3392 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 57,566 psi | 90% | 3425 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,392 psi | 90% | 3481 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 3402 fps | 99.4% |
| Norma MRP | <<locked>> | 88% | 56,101 psi | 88% | 3520 fps | 99.9% |
| Norma URP | <<locked>> | 82% | 54,418 psi | 85% | 3415 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,882 psi | 86% | 3504 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,232 psi | 90% | 3481 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,563 psi | 84% | 3422 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,174 psi | 60% | 2343 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,594 psi | 89% | 3461 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,172 psi | 86% | 3488 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,882 psi | 84% | 3543 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,447 psi | 84% | 3484 fps | 97.6% |
| Rottweil R 904 | <<locked>> | 86% | 54,433 psi | 85% | 3402 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 88% | 56,492 psi | 89% | 3478 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 57,508 psi | 90% | 3442 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,275 psi | 88% | 3402 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,665 psi | 86% | 3392 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,390 psi | 87% | 3346 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,086 psi | 88% | 3471 fps | 99.4% |
| Somchem S361 | <<locked>> | 86% | 56,130 psi | 88% | 3386 fps | 98.2% |
| Somchem S365 | <<locked>> | 84% | 55,695 psi | 87% | 3422 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,145 psi | 90% | 3445 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 56,072 psi | 88% | 3409 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,971 psi | 89% | 3422 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 55,434 psi | 87% | 3412 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,767 psi | 87% | 3445 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,622 psi | 87% | 3514 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 94% | 56,521 psi | 89% | 3501 fps | 98.6% |
| Vihtavuori N568 | <<locked>> | 96% | 53,925 psi | 85% | 3491 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,767 psi | 87% | 3346 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,290 psi | 90% | 3566 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,159 psi | 90% | 3438 fps | 99.5% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,581 psi | 62% | 3071 fps | 98.3% |
| Accurate 4350 | <<locked>> | 80% | 52,431 psi | 82% | 3373 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,323 psi | 68% | 3264 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 84% | 47,572 psi | 75% | 3343 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 43,526 psi | 68% | 3222 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 41,829 psi | 66% | 3205 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 90% | 40,930 psi | 64% | 3166 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 34,795 psi | 55% | 3045 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,038 psi | 78% | 3379 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,555 psi | 68% | 3212 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,624 psi | 62% | 3146 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,232 psi | 60% | 3100 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,025 psi | 52% | 2989 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,178 psi | 68% | 3274 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 52,069 psi | 82% | 3461 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 53,171 psi | 83% | 3383 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 39,349 psi | 62% | 3133 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 40,625 psi | 64% | 3182 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,624 psi | 62% | 3146 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 53,940 psi | 85% | 3376 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 39,015 psi | 61% | 3123 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 53,940 psi | 85% | 3428 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 82% | 44,701 psi | 70% | 3219 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,787 psi | 69% | 3196 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,123 psi | 74% | 3238 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 37,101 psi | 58% | 3163 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 44% | 2060 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,255 psi | 77% | 3291 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 49,530 psi | 78% | 3301 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,902 psi | 67% | 3146 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 43,497 psi | 68% | 3258 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 41,785 psi | 65% | 3228 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 52,866 psi | 83% | 3343 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,271 psi | 80% | 3330 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 33,968 psi | 53% | 2920 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 50,024 psi | 78% | 3340 fps | 98.3% |
| Norma 217 | <<locked>> | 92% | 36,550 psi | 57% | 3110 fps | 96% |
| Norma MRP | <<locked>> | 80% | 41,872 psi | 66% | 3225 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 50,937 psi | 80% | 3353 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,364 psi | 63% | 3186 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 50,009 psi | 78% | 3346 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 36,361 psi | 57% | 3041 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 45% | 2110 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,663 psi | 83% | 3392 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,198 psi | 80% | 3419 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 34,011 psi | 53% | 3051 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 45,643 psi | 72% | 3320 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,599 psi | 70% | 3196 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,018 psi | 67% | 3199 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 53,940 psi | 85% | 3376 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,866 psi | 83% | 3343 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,271 psi | 80% | 3330 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,735 psi | 81% | 3278 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,699 psi | 67% | 3192 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 45,759 psi | 72% | 3179 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 48,428 psi | 76% | 3297 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,671 psi | 68% | 3179 fps | 98% |
| Vihtavuori N160 | <<locked>> | 80% | 52,359 psi | 82% | 3343 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,869 psi | 59% | 3022 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 51,895 psi | 81% | 3346 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,656 psi | 67% | 3192 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 44,933 psi | 70% | 3291 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 42,656 psi | 67% | 3205 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 92% | 46,528 psi | 73% | 3333 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,025 psi | 82% | 3284 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,491 psi | 56% | 3127 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,103 psi | 63% | 3087 fps | 96% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 72 powders for .30-378 Weath. Mag. loaded with the .308 | 135gr | Sierra HPBT MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,629 fps; across all powders the maximum-charge window runs from 2,290 fps to 3,629 fps. ADI AR 2218 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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, ADI AR 2218, Alliant Reloder-50, IMR 7977 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.