Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 175gr | Prvi Partizan FMJ BT bullet and 49 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 ADI AR 2218.
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>> | 86% | 55,709 psi | 87% | 3061 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,737 psi | 86% | 3173 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 56,608 psi | 89% | 3153 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,274 psi | 87% | 3169 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 54,375 psi | 85% | 3150 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,737 psi | 86% | 3264 fps | 98.4% |
| ADI AR 2225 | <<locked>> | 98% | 57,493 psi | 90% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,376 psi | 88% | 3146 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,796 psi | 87% | 3166 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,128 psi | 85% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,520 psi | 85% | 3146 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,578 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,840 psi | 89% | 3248 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3232 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,811 psi | 87% | 3127 fps | 98.4% |
| Bofors RP15 | <<locked>> | 88% | 55,332 psi | 87% | 3156 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,404 psi | 85% | 3159 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,796 psi | 87% | 3166 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,782 psi | 87% | 3169 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,273 psi | 85% | 3097 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,898 psi | 89% | 3143 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,884 psi | 89% | 3054 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,638 psi | 90% | 3297 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,534 psi | 85% | 3074 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 57,609 psi | 90% | 3215 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,405 psi | 88% | 3212 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,566 psi | 90% | 3091 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3232 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,912 psi | 88% | 3179 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,969 psi | 86% | 3173 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 57,638 psi | 90% | 3163 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,841 psi | 61% | 2077 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,491 psi | 85% | 3219 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,838 psi | 84% | 3182 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 57,029 psi | 89% | 3120 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,043 psi | 88% | 3133 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,666 psi | 87% | 3130 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,795 psi | 86% | 3051 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 56,449 psi | 88% | 3100 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,405 psi | 88% | 3084 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,825 psi | 87% | 3110 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 84% | 55,825 psi | 87% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,303 psi | 87% | 3182 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 56,579 psi | 89% | 3179 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 54,346 psi | 85% | 3186 fps | 99% |
| Vihtavuori N570 | <<locked>> | 94% | 55,738 psi | 87% | 3251 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,317 psi | 85% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,275 psi | 88% | 3097 fps | 100% |
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% | 45,542 psi | 71% | 2890 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 47,413 psi | 74% | 3035 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 49,559 psi | 78% | 3031 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 44,860 psi | 70% | 2972 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 33,402 psi | 52% | 2690 fps | 95.1% |
| ADI AR 2218 | 109.5 gr | 92% | 43,874 psi | 69% | 3031 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,777 psi | 48% | 2657 fps | 97.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,414 psi | 77% | 3022 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,643 psi | 72% | 2979 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,266 psi | 69% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,537 psi | 60% | 2844 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,691 psi | 79% | 3091 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,281 psi | 71% | 3025 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,194 psi | 71% | 3012 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,888 psi | 67% | 2874 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 42,409 psi | 66% | 2907 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 36,013 psi | 56% | 2776 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 45,643 psi | 72% | 2979 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 36,390 psi | 57% | 2776 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 80% | 47,253 psi | 74% | 2969 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,528 psi | 73% | 2953 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,417 psi | 84% | 3002 fps | 100% |
| Hodgdon Retumbo | 89.9 gr | 80% | 37,652 psi | 59% | 2894 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,051 psi | 75% | 2956 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 43,613 psi | 68% | 2953 fps | 98.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,882 psi | 55% | 2762 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 39,189 psi | 61% | 2759 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 30,589 psi | 48% | 2657 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 48,631 psi | 76% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,932 psi | 69% | 2969 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 80% | 39,566 psi | 62% | 2835 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1860 fps | 100% |
| ReloadSwiss RS 76 | 96.2 gr | 80% | 37,101 psi | 58% | 2867 fps | 99.2% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,682 psi | 62% | 2890 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,125 psi | 79% | 2999 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 49,081 psi | 77% | 3012 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,733 psi | 76% | 3009 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 51,213 psi | 80% | 2989 fps | 99% |
| Somchem S385 | <<locked>> | 80% | 49,545 psi | 78% | 2986 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,323 psi | 68% | 2854 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 48,704 psi | 76% | 2982 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,008 psi | 77% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,167 psi | 75% | 3048 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 40,147 psi | 63% | 2854 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 40,727 psi | 64% | 2907 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 88% | 44,817 psi | 70% | 3035 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,250 psi | 68% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,672 psi | 72% | 2910 fps | 99.3% |
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 58 powders for .30-378 Weath. Mag. loaded with the .308 | 175gr | Prvi Partizan FMJ BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,297 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,297 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 175.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, 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. Hodgdon Retumbo, ReloadSwiss RS 76, ADI AR 2218 rank at the top here: for .30-378 Weath. Mag. with the .308 | 175gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.