Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Brenneke TAG bullet and 59 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 54,375 psi | 85% | 3202 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,522 psi | 90% | 3379 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 56,028 psi | 88% | 3310 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,418 psi | 85% | 3314 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 57,029 psi | 89% | 3350 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 3386 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,637 psi | 87% | 3366 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,043 psi | 88% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,564 psi | 87% | 3294 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,766 psi | 86% | 3310 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,376 psi | 88% | 3274 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,768 psi | 89% | 3346 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,188 psi | 90% | 3366 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,100 psi | 86% | 3369 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,303 psi | 87% | 3268 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 53,998 psi | 85% | 3294 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 56,550 psi | 89% | 3356 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 54,766 psi | 86% | 3310 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 54,578 psi | 86% | 3307 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 57,377 psi | 90% | 3307 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,362 psi | 88% | 3294 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,144 psi | 88% | 3212 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,840 psi | 88% | 3438 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2149 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,607 psi | 86% | 3222 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,027 psi | 86% | 3225 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,711 psi | 90% | 3287 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 56,565 psi | 89% | 3360 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,705 psi | 79% | 3264 fps | 99% |
| Lovex S070 | <<locked>> | 82% | 56,637 psi | 89% | 3255 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,028 psi | 88% | 3232 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,869 psi | 88% | 3284 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,561 psi | 81% | 3291 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,839 psi | 86% | 3327 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,652 psi | 89% | 3274 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,708 psi | 84% | 3314 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 55,825 psi | 87% | 3281 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,478 psi | 89% | 3304 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,334 psi | 60% | 2198 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,740 psi | 90% | 3350 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,072 psi | 89% | 3428 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,347 psi | 88% | 3379 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 56,565 psi | 89% | 3274 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 55,085 psi | 86% | 3281 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,637 psi | 89% | 3255 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,159 psi | 90% | 3205 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,694 psi | 86% | 3278 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,418 psi | 85% | 3196 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 54,273 psi | 85% | 3219 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,564 psi | 87% | 3248 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,608 psi | 87% | 3235 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 57,551 psi | 90% | 3268 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,462 psi | 85% | 3248 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,346 psi | 85% | 3323 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 55,056 psi | 86% | 3310 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 56,855 psi | 89% | 3383 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 53,969 psi | 85% | 3376 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,434 psi | 88% | 3366 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,564 psi | 87% | 3245 fps | 99.8% |
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% | 41,017 psi | 64% | 2949 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 80% | 42,888 psi | 67% | 3084 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 45,411 psi | 71% | 3104 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,698 psi | 64% | 3025 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 37,130 psi | 58% | 2927 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 49,661 psi | 78% | 3297 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 31,502 psi | 49% | 2808 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,417 psi | 82% | 3241 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,339 psi | 71% | 3094 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,307 psi | 65% | 3031 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,943 psi | 63% | 2976 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,447 psi | 54% | 2887 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,411 psi | 71% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,908 psi | 80% | 3284 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,443 psi | 76% | 3136 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 38,305 psi | 60% | 2956 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 36,927 psi | 58% | 2936 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 41,307 psi | 65% | 3031 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 82% | 35,186 psi | 55% | 2877 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 43,323 psi | 68% | 3035 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,525 psi | 67% | 3015 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,110 psi | 77% | 3097 fps | 100% |
| Hodgdon Retumbo | 91.8 gr | 80% | 33,605 psi | 53% | 2913 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 44% | 1929 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,111 psi | 80% | 3159 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,387 psi | 81% | 3163 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,454 psi | 70% | 3028 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,349 psi | 62% | 3002 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,189 psi | 60% | 2986 fps | 95.7% |
| Lovex S070 | <<locked>> | 80% | 53,026 psi | 83% | 3192 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,172 psi | 55% | 2808 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 52,054 psi | 82% | 3215 fps | 99.4% |
| Norma 217 | <<locked>> | 88% | 33,199 psi | 52% | 2867 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 43,918 psi | 69% | 3114 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 52,939 psi | 83% | 3212 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,305 psi | 62% | 3009 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 52,040 psi | 82% | 3215 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,259 psi | 55% | 2867 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 1972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,679 psi | 84% | 3284 fps | 100% |
| ReloadSwiss RS 76 | 98.3 gr | 80% | 32,924 psi | 52% | 2884 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,046 psi | 64% | 3064 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,282 psi | 73% | 3077 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,802 psi | 70% | 3081 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 53,026 psi | 83% | 3192 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,447 psi | 84% | 3143 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,469 psi | 70% | 3074 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 47,369 psi | 74% | 3061 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 50,589 psi | 79% | 3159 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,223 psi | 71% | 3054 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 80% | 39,392 psi | 62% | 2913 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 80% | 53,751 psi | 84% | 3205 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,338 psi | 69% | 3064 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,685 psi | 68% | 3104 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 38,653 psi | 61% | 2956 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 88% | 42,177 psi | 66% | 3084 fps | 95% |
| Vihtavuori N570 | 112 gr | 94% | 50,038 psi | 78% | 3294 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,855 psi | 59% | 3022 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,684 psi | 65% | 2976 fps | 97.7% |
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 59 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Brenneke TAG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,438 fps; across all powders the maximum-charge window runs from 2,149 fps to 3,438 fps. ADI AR 2218 gives the best case fill at 100 %, and 59 of the 59 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 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Hodgdon TrailBoss 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 155gr | Brenneke TAG 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.