Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 145gr | Prvi Partizan FMJ BT bullet and 63 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD 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>> | 90% | 57,508 psi | 90% | 3337 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,696 psi | 90% | 3366 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,478 psi | 89% | 3438 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 54,984 psi | 86% | 3369 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 90% | 57,116 psi | 90% | 3445 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 55,738 psi | 87% | 3406 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 3428 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,027 psi | 86% | 3369 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,578 psi | 86% | 3353 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,508 psi | 90% | 3438 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,492 psi | 87% | 3343 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,550 psi | 87% | 3412 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,086 psi | 88% | 3432 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,853 psi | 84% | 3415 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,288 psi | 85% | 3323 fps | 96.5% |
| Bofors RP15 | <<locked>> | 92% | 56,826 psi | 89% | 3425 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 55,419 psi | 87% | 3415 fps | 99.3% |
| Bofors RP5 | <<locked>> | 90% | 57,508 psi | 90% | 3438 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 57,348 psi | 90% | 3432 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 56,463 psi | 88% | 3369 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,303 psi | 87% | 3350 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,288 psi | 87% | 3284 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,476 psi | 85% | 3497 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 59% | 2215 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,377 psi | 90% | 3350 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,288 psi | 85% | 3294 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,898 psi | 89% | 3350 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 55,434 psi | 87% | 3419 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,647 psi | 78% | 3317 fps | 98.4% |
| Lovex S065 | <<locked>> | 82% | 57,551 psi | 90% | 3327 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,985 psi | 88% | 3327 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,317 psi | 87% | 3301 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,940 psi | 86% | 3346 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 50,560 psi | 79% | 3350 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 57,682 psi | 90% | 3455 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,825 psi | 87% | 3346 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,521 psi | 89% | 3442 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 54,911 psi | 86% | 3346 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,274 psi | 87% | 3363 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 2264 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,710 psi | 89% | 3419 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,550 psi | 87% | 3484 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,158 psi | 86% | 3435 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,622 psi | 87% | 3333 fps | 99% |
| Rottweil R 905 | <<locked>> | 86% | 54,331 psi | 85% | 3350 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,551 psi | 90% | 3327 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,985 psi | 88% | 3327 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,478 psi | 89% | 3271 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,537 psi | 90% | 3406 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 57,392 psi | 90% | 3320 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 57,188 psi | 90% | 3346 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,752 psi | 86% | 3314 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 57,377 psi | 90% | 3333 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,607 psi | 86% | 3294 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 56,782 psi | 89% | 3340 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,276 psi | 90% | 3373 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,145 psi | 90% | 3455 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 54,201 psi | 85% | 3369 fps | 98.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,550 psi | 87% | 3438 fps | 98% |
| Vihtavuori N570 | <<locked>> | 98% | 56,724 psi | 89% | 3501 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,130 psi | 90% | 3274 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,042 psi | 86% | 3432 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,578 psi | 86% | 3304 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% | 40,785 psi | 64% | 3015 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 53,838 psi | 84% | 3304 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 45,498 psi | 71% | 3215 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 44,744 psi | 70% | 3163 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,103 psi | 63% | 3081 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 88% | 39,276 psi | 62% | 3051 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 86% | 33,547 psi | 53% | 2936 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,372 psi | 81% | 3307 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,744 psi | 70% | 3153 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,741 psi | 64% | 3091 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,436 psi | 62% | 3041 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,055 psi | 53% | 2946 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,570 psi | 70% | 3219 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,835 psi | 78% | 3337 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,966 psi | 80% | 3258 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 37,884 psi | 59% | 3015 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 39,102 psi | 61% | 3064 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 40,741 psi | 64% | 3091 fps | 96.8% |
| Hodgdon H1000 | <<locked>> | 84% | 37,405 psi | 59% | 3002 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,728 psi | 67% | 3091 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,974 psi | 66% | 3071 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,356 psi | 76% | 3166 fps | 100% |
| Hodgdon Retumbo | 94.8 gr | 82% | 35,650 psi | 56% | 3041 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 44% | 1988 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,430 psi | 79% | 3225 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 50,792 psi | 80% | 3235 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,932 psi | 69% | 3091 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 82% | 41,611 psi | 65% | 3127 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 94% | 40,292 psi | 63% | 3110 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,983 psi | 85% | 3268 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,489 psi | 82% | 3264 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 35,041 psi | 55% | 2871 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 51,242 psi | 80% | 3274 fps | 98.9% |
| Norma 217 | <<locked>> | 88% | 32,866 psi | 52% | 2927 fps | 95% |
| Norma MRP | <<locked>> | 80% | 43,192 psi | 68% | 3173 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 52,228 psi | 82% | 3281 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,667 psi | 61% | 3061 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 51,285 psi | 80% | 3281 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,780 psi | 55% | 2923 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 2034 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,605 psi | 82% | 3350 fps | 100% |
| ReloadSwiss RS 76 | 99 gr | 80% | 32,576 psi | 51% | 2933 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 43,642 psi | 68% | 3196 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 45,687 psi | 72% | 3136 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 80% | 44,208 psi | 69% | 3143 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,983 psi | 85% | 3268 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,489 psi | 82% | 3264 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,924 psi | 83% | 3212 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,918 psi | 69% | 3136 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 46,804 psi | 73% | 3120 fps | 96.7% |
| Somchem S365 | <<locked>> | 80% | 49,850 psi | 78% | 3228 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,744 psi | 70% | 3117 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,693 psi | 84% | 3274 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,986 psi | 61% | 2972 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 80% | 53,069 psi | 83% | 3274 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,903 psi | 69% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,989 psi | 67% | 3163 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 84% | 40,959 psi | 64% | 3084 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 90% | 44,643 psi | 70% | 3212 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 52,692 psi | 83% | 3422 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,229 psi | 83% | 3215 fps | 100% |
| Winchester StaBALL HD | 95 gr | 80% | 37,014 psi | 58% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,176 psi | 65% | 3031 fps | 97% |
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 70 powders for .30-378 Weath. Mag. loaded with the .308 | 145gr | Prvi Partizan FMJ BT. Vihtavuori N570 delivers the highest muzzle velocity at 3,501 fps; across all powders the maximum-charge window runs from 2,215 fps to 3,501 fps. ADI AR 2218 gives the best case fill at 100 %, and 70 of the 70 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 145.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 145gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, 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.