Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 148gr | Hasler ARIETE bullet and 69 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>> | 90% | 55,637 psi | 87% | 3284 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,883 psi | 88% | 3317 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,624 psi | 90% | 3455 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 88% | 54,766 psi | 86% | 3389 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,464 psi | 90% | 3392 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 90% | 55,695 psi | 87% | 3396 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 54,085 psi | 85% | 3356 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3373 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,290 psi | 90% | 3383 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,869 psi | 89% | 3373 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,941 psi | 88% | 3389 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,580 psi | 90% | 3356 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 53,838 psi | 84% | 3363 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,157 psi | 85% | 3379 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 3438 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,782 psi | 89% | 3346 fps | 97.2% |
| Bofors RP15 | <<locked>> | 92% | 55,129 psi | 86% | 3373 fps | 99.6% |
| Bofors RP30 | <<locked>> | 98% | 57,493 psi | 90% | 3432 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 55,941 psi | 88% | 3389 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 57,377 psi | 90% | 3320 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,695 psi | 87% | 3386 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 82% | 57,566 psi | 90% | 3376 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,897 psi | 86% | 3320 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 53,911 psi | 84% | 3301 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,493 psi | 90% | 3294 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,623 psi | 89% | 3514 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 59% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,144 psi | 88% | 3307 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 56,463 psi | 88% | 3307 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,637 psi | 87% | 3304 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 53,780 psi | 84% | 3369 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,761 psi | 75% | 3264 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 56,101 psi | 88% | 3281 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,476 psi | 85% | 3274 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,000 psi | 89% | 3304 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,493 psi | 90% | 3369 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 48,399 psi | 76% | 3291 fps | 99.6% |
| Norma MRP | <<locked>> | 88% | 55,927 psi | 88% | 3406 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,302 psi | 85% | 3294 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,781 psi | 86% | 3392 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 84% | 57,276 psi | 90% | 3363 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,417 psi | 84% | 3314 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,159 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,463 psi | 88% | 3340 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,129 psi | 86% | 3369 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,693 psi | 84% | 3432 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,464 psi | 90% | 3455 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 54,375 psi | 85% | 3291 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 88% | 56,391 psi | 88% | 3363 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 57,377 psi | 90% | 3320 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,101 psi | 88% | 3281 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,476 psi | 85% | 3274 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,085 psi | 86% | 3225 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,985 psi | 88% | 3356 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 55,970 psi | 88% | 3274 fps | 98.7% |
| Somchem S365 | <<locked>> | 84% | 55,564 psi | 87% | 3301 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,884 psi | 89% | 3327 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,912 psi | 88% | 3287 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,797 psi | 89% | 3307 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,158 psi | 86% | 3291 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,579 psi | 87% | 3327 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,506 psi | 87% | 3406 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 94% | 56,173 psi | 88% | 3386 fps | 99% |
| Vihtavuori N568 | <<locked>> | 96% | 53,621 psi | 84% | 3379 fps | 97.7% |
| Vihtavuori N570 | <<locked>> | 98% | 54,781 psi | 86% | 3445 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,753 psi | 87% | 3232 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,725 psi | 90% | 3379 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,217 psi | 90% | 3445 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,029 psi | 89% | 3327 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,117 psi | 61% | 2956 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 52,185 psi | 82% | 3251 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,076 psi | 68% | 3159 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 82% | 43,874 psi | 69% | 3159 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,511 psi | 68% | 3117 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 41,669 psi | 65% | 3100 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 40,756 psi | 64% | 3071 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 86% | 32,097 psi | 50% | 2874 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,024 psi | 78% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,497 psi | 68% | 3107 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,378 psi | 62% | 3038 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,956 psi | 59% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,721 psi | 51% | 2887 fps | 97.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,757 psi | 67% | 3159 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,793 psi | 81% | 3360 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,792 psi | 78% | 3209 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 36,492 psi | 57% | 2959 fps | 95.2% |
| Bofors RP30 | <<locked>> | 88% | 40,321 psi | 63% | 3077 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 39,378 psi | 62% | 3038 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 53,795 psi | 84% | 3255 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,696 psi | 61% | 3018 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,795 psi | 84% | 3314 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 41,365 psi | 65% | 3038 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,613 psi | 68% | 3091 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,934 psi | 74% | 3120 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 34,214 psi | 54% | 2979 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 44% | 1965 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,255 psi | 77% | 3179 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 49,342 psi | 77% | 3186 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,786 psi | 67% | 3041 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 40,219 psi | 63% | 3077 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,551 psi | 60% | 3048 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,634 psi | 82% | 3222 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,097 psi | 80% | 3215 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,446 psi | 52% | 2812 fps | 97% |
| Norma 204 | <<locked>> | 80% | 49,908 psi | 78% | 3228 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 33,533 psi | 53% | 2930 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 41,640 psi | 65% | 3117 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 50,850 psi | 80% | 3235 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,118 psi | 63% | 3081 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,879 psi | 78% | 3235 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,301 psi | 52% | 2864 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,514 psi | 45% | 2008 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,504 psi | 82% | 3274 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,155 psi | 80% | 3301 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 33,620 psi | 53% | 2953 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 45,165 psi | 71% | 3212 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 44,498 psi | 70% | 3091 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 42,844 psi | 67% | 3091 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 80% | 53,795 psi | 84% | 3255 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,634 psi | 82% | 3222 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,097 psi | 80% | 3215 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,634 psi | 81% | 3166 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,511 psi | 67% | 3084 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 45,527 psi | 71% | 3074 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 48,327 psi | 76% | 3182 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,366 psi | 68% | 3068 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 52,344 psi | 82% | 3228 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,666 psi | 59% | 2923 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 80% | 51,576 psi | 81% | 3228 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,250 psi | 66% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,539 psi | 65% | 3107 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 42,293 psi | 66% | 3100 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 46,209 psi | 72% | 3228 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 50,879 psi | 80% | 3369 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,808 psi | 81% | 3169 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,954 psi | 85% | 3314 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,259 psi | 55% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,769 psi | 62% | 2979 fps | 96.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 73 powders for .30-378 Weath. Mag. loaded with the .308 | 148gr | Hasler ARIETE. Hodgdon Retumbo delivers the highest muzzle velocity at 3,514 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,514 fps. ADI AR 2218 gives the best case fill at 100 %, and 73 of the 73 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 148.0 gr projectile in 0.308" calls for a 1:12.0 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, 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.