Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 140gr | Barnes X BT bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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>> | 88% | 56,623 psi | 89% | 3353 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,653 psi | 90% | 3514 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 86% | 54,897 psi | 86% | 3445 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 86% | 56,739 psi | 89% | 3435 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 88% | 55,027 psi | 86% | 3442 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 98% | 57,638 psi | 90% | 3474 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3501 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,971 psi | 89% | 3432 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,753 psi | 89% | 3438 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,376 psi | 88% | 3425 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,825 psi | 87% | 3442 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,696 psi | 90% | 3419 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,595 psi | 90% | 3484 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,665 psi | 86% | 3448 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,246 psi | 88% | 3497 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,680 psi | 87% | 3383 fps | 96.5% |
| Bofors RP15 | <<locked>> | 90% | 55,259 psi | 87% | 3432 fps | 99.4% |
| Bofors RP30 | <<locked>> | 94% | 54,186 psi | 85% | 3428 fps | 99% |
| Bofors RP5 | <<locked>> | 88% | 55,825 psi | 87% | 3442 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 94% | 55,317 psi | 87% | 3435 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 86% | 54,404 psi | 85% | 3366 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,087 psi | 89% | 3415 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,246 psi | 90% | 3350 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,521 psi | 89% | 3573 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 2251 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,506 psi | 87% | 3353 fps | 99.8% |
| IMR 4831 | <<locked>> | 82% | 56,565 psi | 89% | 3369 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,027 psi | 86% | 3350 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 90% | 57,276 psi | 90% | 3491 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,185 psi | 82% | 3406 fps | 98.7% |
| Lovex S071 | <<locked>> | 92% | 54,926 psi | 86% | 3327 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,753 psi | 89% | 3412 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3442 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 55,999 psi | 88% | 3468 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,447 psi | 85% | 3442 fps | 99% |
| Ramshot Hunter | <<locked>> | 82% | 56,826 psi | 89% | 3419 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,522 psi | 90% | 3435 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,754 psi | 61% | 2303 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,795 psi | 84% | 3491 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,693 psi | 84% | 3445 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 86% | 57,319 psi | 90% | 3399 fps | 99% |
| Rottweil R 905 | <<locked>> | 86% | 56,347 psi | 88% | 3419 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,014 psi | 88% | 3412 fps | 99.5% |
| Somchem S361 | <<locked>> | 84% | 55,477 psi | 87% | 3320 fps | 98.3% |
| Somchem S365 | <<locked>> | 82% | 55,724 psi | 87% | 3363 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,029 psi | 89% | 3389 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 90% | 56,666 psi | 89% | 3363 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 86% | 56,347 psi | 88% | 3399 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,332 psi | 87% | 3458 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 92% | 56,797 psi | 89% | 3455 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 94% | 54,056 psi | 85% | 3442 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,522 psi | 90% | 3514 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,579 psi | 89% | 3373 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,801 psi | 69% | 3114 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 47,036 psi | 74% | 3301 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 80% | 44,643 psi | 70% | 3225 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 46,586 psi | 73% | 3238 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 42,105 psi | 66% | 3163 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 41,423 psi | 65% | 3133 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 33,750 psi | 53% | 2969 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,050 psi | 74% | 3238 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,113 psi | 83% | 3376 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,659 psi | 73% | 3232 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,018 psi | 67% | 3176 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,800 psi | 66% | 3130 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,376 psi | 57% | 3041 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,210 psi | 74% | 3310 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 52,286 psi | 82% | 3422 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 52,388 psi | 82% | 3317 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 40,161 psi | 63% | 3107 fps | 96.2% |
| Bofors RP30 | <<locked>> | 84% | 39,030 psi | 61% | 3094 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 43,018 psi | 67% | 3176 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 84% | 39,537 psi | 62% | 3087 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 44,672 psi | 70% | 3166 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,903 psi | 69% | 3146 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,430 psi | 79% | 3238 fps | 100% |
| Hodgdon Retumbo | 92.4 gr | 80% | 35,578 psi | 56% | 3068 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 45% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,141 psi | 82% | 3291 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 53,113 psi | 83% | 3307 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,687 psi | 72% | 3159 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,857 psi | 64% | 3140 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 40,132 psi | 63% | 3140 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 38,101 psi | 60% | 2976 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 53,055 psi | 83% | 3343 fps | 99% |
| Norma 217 | <<locked>> | 86% | 33,417 psi | 52% | 2972 fps | 95% |
| Norma MRP | <<locked>> | 80% | 45,556 psi | 71% | 3261 fps | 98.9% |
| Ramshot Grand | <<locked>> | 80% | 40,944 psi | 64% | 3150 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 53,229 psi | 83% | 3353 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,275 psi | 58% | 3018 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,182 psi | 46% | 2070 fps | 100% |
| ReloadSwiss RS 76 | 98.9 gr | 80% | 35,070 psi | 55% | 3041 fps | 96.4% |
| ReloadSwiss RS 80 | 112.2 gr | 90% | 46,282 psi | 73% | 3287 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,500 psi | 74% | 3209 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 46,398 psi | 73% | 3222 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,064 psi | 72% | 3215 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 48,733 psi | 76% | 3192 fps | 96.9% |
| Somchem S365 | <<locked>> | 80% | 52,156 psi | 82% | 3304 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,137 psi | 74% | 3199 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,205 psi | 65% | 3054 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 80% | 46,688 psi | 73% | 3222 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,179 psi | 71% | 3245 fps | 96% |
| Vihtavuori N565 | <<locked>> | 84% | 43,671 psi | 68% | 3182 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 47,123 psi | 74% | 3301 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,668 psi | 62% | 3186 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,352 psi | 68% | 3110 fps | 97.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 53 powders for .30-378 Weath. Mag. loaded with the .308 | 140gr | Barnes X BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,573 fps; across all powders the maximum-charge window runs from 2,251 fps to 3,573 fps. ADI AR 2225 gives the best case fill at 100 %, and 53 of the 53 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 140.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, IMR 8133 Enduron 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 140gr | Barnes X BT they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.