Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Sierra MatchKing bullet and 57 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>> | 88% | 55,709 psi | 87% | 3264 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,508 psi | 90% | 3432 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,534 psi | 85% | 3363 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 86% | 56,826 psi | 89% | 3360 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,332 psi | 87% | 3369 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 53,925 psi | 85% | 3333 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3445 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3422 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,782 psi | 89% | 3353 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,362 psi | 88% | 3346 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,782 psi | 87% | 3366 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,450 psi | 90% | 3327 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 53,998 psi | 85% | 3343 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,230 psi | 85% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,333 psi | 88% | 3425 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,130 psi | 88% | 3317 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 55,013 psi | 86% | 3350 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 57,696 psi | 90% | 3412 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 55,782 psi | 87% | 3366 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,506 psi | 87% | 3363 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,476 psi | 85% | 3294 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,217 psi | 90% | 3343 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,956 psi | 89% | 3264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,869 psi | 89% | 3494 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 59% | 2185 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,419 psi | 87% | 3274 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,101 psi | 88% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,940 psi | 86% | 3278 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 57,450 psi | 90% | 3415 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,982 psi | 81% | 3327 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,638 psi | 90% | 3310 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,363 psi | 90% | 3291 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,681 psi | 89% | 3333 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 52,910 psi | 83% | 3350 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,883 psi | 88% | 3386 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,667 psi | 90% | 3330 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,679 psi | 86% | 3369 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,695 psi | 89% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,522 psi | 90% | 3356 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,795 psi | 84% | 3409 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,696 psi | 90% | 3435 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 57,305 psi | 90% | 3323 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,173 psi | 88% | 3337 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,638 psi | 90% | 3310 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,767 psi | 87% | 3330 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,317 psi | 87% | 3248 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,361 psi | 87% | 3274 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,492 psi | 89% | 3304 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,550 psi | 89% | 3284 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,637 psi | 87% | 3304 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,303 psi | 87% | 3379 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,289 psi | 88% | 3366 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 53,998 psi | 85% | 3369 fps | 98% |
| Vihtavuori N570 | <<locked>> | 96% | 55,143 psi | 86% | 3432 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,682 psi | 90% | 3425 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,507 psi | 89% | 3297 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,351 psi | 66% | 3012 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 46,427 psi | 73% | 3212 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 43,903 psi | 69% | 3140 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,340 psi | 73% | 3159 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,611 psi | 65% | 3084 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 38,014 psi | 60% | 2982 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 50,720 psi | 79% | 3353 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 32,503 psi | 51% | 2867 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,069 psi | 83% | 3294 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,296 psi | 73% | 3150 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,322 psi | 66% | 3091 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,944 psi | 64% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,491 psi | 56% | 2949 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,543 psi | 73% | 3215 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,327 psi | 76% | 3268 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,240 psi | 77% | 3186 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,392 psi | 62% | 3018 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 38,043 psi | 60% | 2999 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 42,322 psi | 66% | 3091 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,114 psi | 57% | 2933 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 44,222 psi | 69% | 3087 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,453 psi | 68% | 3068 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,908 psi | 78% | 3150 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,650 psi | 54% | 2979 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 44% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,011 psi | 82% | 3212 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,533 psi | 82% | 3222 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,324 psi | 71% | 3084 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,321 psi | 63% | 3058 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,305 psi | 62% | 3048 fps | 95.8% |
| Lovex S070 | <<locked>> | 80% | 54,070 psi | 85% | 3248 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,361 psi | 57% | 2871 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 52,924 psi | 83% | 3268 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,039 psi | 50% | 2864 fps | 95% |
| Norma MRP | <<locked>> | 80% | 44,962 psi | 70% | 3173 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 53,969 psi | 85% | 3268 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,292 psi | 63% | 3068 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 52,982 psi | 83% | 3271 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,289 psi | 57% | 2927 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 2008 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,939 psi | 53% | 2943 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,264 psi | 66% | 3123 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 47,181 psi | 74% | 3133 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,861 psi | 72% | 3140 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 54,070 psi | 85% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,513 psi | 71% | 3133 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 48,240 psi | 76% | 3114 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,750 psi | 81% | 3215 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,340 psi | 73% | 3114 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,422 psi | 63% | 2969 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 45,629 psi | 72% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,657 psi | 70% | 3163 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,813 psi | 62% | 3018 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 43,366 psi | 68% | 3143 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 94% | 51,242 psi | 80% | 3353 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,044 psi | 61% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,685 psi | 67% | 3031 fps | 97.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 64 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,494 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,494 fps. Accurate 8700 gives the best case fill at 100 %, and 64 of the 64 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 150.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.