Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Prvi Partizan SP bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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>> | 84% | 54,128 psi | 85% | 3002 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,313 psi | 77% | 3018 fps | 96.8% |
| Accurate MAGPRO | <<locked>> | 84% | 56,971 psi | 89% | 3176 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 54,926 psi | 86% | 3091 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,537 psi | 90% | 3173 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,869 psi | 89% | 3153 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,609 psi | 90% | 3287 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 96% | 56,318 psi | 88% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,621 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,288 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,420 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,087 psi | 89% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,101 psi | 89% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,376 psi | 87% | 3189 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,506 psi | 87% | 3179 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,128 psi | 85% | 3068 fps | 98.4% |
| Bofors RP15 | <<locked>> | 88% | 57,566 psi | 90% | 3156 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,898 psi | 89% | 3166 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,288 psi | 85% | 3104 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,288 psi | 85% | 3107 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,347 psi | 88% | 3097 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,187 psi | 86% | 3081 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,608 psi | 89% | 3241 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,913 psi | 59% | 2011 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,434 psi | 88% | 3074 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,130 psi | 88% | 3156 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,361 psi | 87% | 3156 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,246 psi | 88% | 3035 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,739 psi | 89% | 3179 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,447 psi | 85% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,696 psi | 90% | 3179 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,086 psi | 88% | 3100 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,015 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,508 psi | 90% | 3222 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,768 psi | 89% | 3196 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,317 psi | 87% | 3058 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,462 psi | 85% | 3071 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 3035 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,099 psi | 85% | 3068 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,652 psi | 89% | 3048 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,708 psi | 86% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,926 psi | 86% | 3028 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,259 psi | 85% | 3054 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 54,404 psi | 85% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,711 psi | 90% | 3186 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,187 psi | 86% | 3120 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,000 psi | 89% | 3196 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 54,578 psi | 86% | 3196 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,348 psi | 90% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,534 psi | 85% | 3035 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% | 47,398 psi | 74% | 2890 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,876 psi | 72% | 2953 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,545 psi | 78% | 3041 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 51,459 psi | 81% | 3031 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,789 psi | 73% | 2979 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 34,911 psi | 55% | 2703 fps | 96.3% |
| ADI AR 2218 | 109 gr | 90% | 42,786 psi | 67% | 2976 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 32,256 psi | 51% | 2674 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,271 psi | 80% | 3022 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,543 psi | 75% | 2979 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,253 psi | 72% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,437 psi | 63% | 2851 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,113 psi | 83% | 3091 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,193 psi | 69% | 2969 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,324 psi | 69% | 2959 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,483 psi | 70% | 2877 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 44,222 psi | 69% | 2910 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 37,782 psi | 59% | 2785 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 47,543 psi | 75% | 2979 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 38,029 psi | 60% | 2785 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 49,037 psi | 77% | 2969 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,312 psi | 76% | 2956 fps | 98.8% |
| Hodgdon Retumbo | 91.5 gr | 80% | 39,537 psi | 62% | 2907 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,558 psi | 45% | 1804 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,719 psi | 78% | 2956 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,585 psi | 71% | 2959 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,229 psi | 54% | 2710 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 40,828 psi | 64% | 2762 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,124 psi | 47% | 2612 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 50,676 psi | 79% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,079 psi | 72% | 2979 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 41,568 psi | 65% | 2841 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,240 psi | 46% | 1844 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,059 psi | 61% | 2881 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,940 psi | 56% | 2762 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 51,924 psi | 81% | 2999 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 51,024 psi | 80% | 3015 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 48,008 psi | 75% | 2969 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,705 psi | 79% | 3009 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,026 psi | 83% | 2989 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,387 psi | 81% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,063 psi | 71% | 2854 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,326 psi | 74% | 2923 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 51,039 psi | 80% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,125 psi | 79% | 3051 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 41,930 psi | 66% | 2861 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 39,842 psi | 62% | 2851 fps | 95.9% |
| Vihtavuori N570 | 102 gr | 86% | 43,816 psi | 69% | 2976 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,658 psi | 72% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,442 psi | 74% | 2910 fps | 99.7% |
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 58 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Prvi Partizan SP. ADI AR 2218 delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,287 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 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869, 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.