Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 167gr | MRR Green Hunting bullet and 56 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 80 and Vihtavuori N570.
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% | 56,260 psi | 88% | 3136 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,476 psi | 85% | 3241 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 86% | 55,477 psi | 87% | 3248 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 54,041 psi | 85% | 3176 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,217 psi | 88% | 3248 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,129 psi | 86% | 3222 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3340 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 98% | 53,998 psi | 85% | 3245 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 54,230 psi | 85% | 3169 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,246 psi | 90% | 3225 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,565 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,636 psi | 86% | 3143 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,085 psi | 86% | 3219 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,158 psi | 86% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,392 psi | 90% | 3317 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3219 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,000 psi | 89% | 3205 fps | 98.2% |
| Bofors RP15 | <<locked>> | 90% | 55,927 psi | 88% | 3232 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 54,824 psi | 86% | 3232 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 56,565 psi | 89% | 3241 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,594 psi | 89% | 3245 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,303 psi | 87% | 3176 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,288 psi | 85% | 3159 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,128 psi | 85% | 3081 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,157 psi | 85% | 3310 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 59% | 2073 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,144 psi | 88% | 3150 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,710 psi | 89% | 3150 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,738 psi | 87% | 3156 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 54,650 psi | 86% | 3228 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3212 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 54,244 psi | 85% | 3104 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,537 psi | 90% | 3212 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 53,925 psi | 85% | 3238 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,753 psi | 89% | 3258 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,854 psi | 88% | 3255 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 57,493 psi | 90% | 3205 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,302 psi | 85% | 3173 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 2119 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,100 psi | 86% | 3294 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,273 psi | 85% | 3248 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 54,621 psi | 86% | 3143 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 57,014 psi | 89% | 3215 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,623 psi | 89% | 3212 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,941 psi | 88% | 3130 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 56,130 psi | 88% | 3140 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,319 psi | 90% | 3179 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,348 psi | 90% | 3166 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,594 psi | 89% | 3182 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 86% | 56,275 psi | 88% | 3173 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,217 psi | 88% | 3264 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 57,174 psi | 90% | 3251 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 54,984 psi | 86% | 3258 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 96% | 56,188 psi | 88% | 3320 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,737 psi | 86% | 3235 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,305 psi | 90% | 3176 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% | 42,598 psi | 67% | 2894 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 47,123 psi | 74% | 3100 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 80% | 44,628 psi | 70% | 3035 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 47,021 psi | 74% | 3045 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 42,293 psi | 66% | 2976 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 35,998 psi | 56% | 2815 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 96% | 47,877 psi | 75% | 3179 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 28,543 psi | 45% | 2631 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,355 psi | 74% | 3045 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,920 psi | 74% | 3035 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,931 psi | 67% | 2982 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,684 psi | 65% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,926 psi | 56% | 2841 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,326 psi | 74% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,440 psi | 71% | 3084 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 48,559 psi | 76% | 3140 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,702 psi | 73% | 3012 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 39,827 psi | 62% | 2907 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 35,810 psi | 56% | 2825 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,931 psi | 67% | 2982 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 34,040 psi | 53% | 2766 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 44,918 psi | 70% | 2979 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,063 psi | 69% | 2959 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,763 psi | 80% | 3025 fps | 100% |
| Hodgdon Retumbo | 90.2 gr | 80% | 35,099 psi | 55% | 2881 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,649 psi | 83% | 3091 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,127 psi | 83% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,832 psi | 72% | 2969 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,959 psi | 64% | 2953 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,115 psi | 58% | 2874 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 36,477 psi | 57% | 2756 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 53,708 psi | 84% | 3150 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 30,168 psi | 47% | 2700 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 45,687 psi | 72% | 3058 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 41,002 psi | 64% | 2963 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 80% | 53,751 psi | 84% | 3146 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,869 psi | 58% | 2828 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,330 psi | 54% | 2844 fps | 98% |
| ReloadSwiss RS 80 | 104.6 gr | 86% | 39,668 psi | 62% | 2943 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 47,776 psi | 75% | 3015 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 46,427 psi | 73% | 3022 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,093 psi | 72% | 3018 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 48,892 psi | 77% | 3002 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 52,446 psi | 82% | 3084 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,847 psi | 73% | 2995 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 40,872 psi | 64% | 2861 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 52,692 psi | 83% | 3114 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 46,035 psi | 72% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,368 psi | 71% | 3051 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 37,376 psi | 59% | 2841 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 86% | 40,785 psi | 64% | 2966 fps | 95.2% |
| Vihtavuori N570 | 107.6 gr | 92% | 48,399 psi | 76% | 3169 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,856 psi | 62% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,120 psi | 68% | 2920 fps | 98.6% |
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 56 powders for .30-378 Weath. Mag. loaded with the .308 | 167gr | MRR Green Hunting. ADI AR 2218 delivers the highest muzzle velocity at 3,340 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,340 fps. ADI AR 2218 gives the best case fill at 100 %, and 56 of the 56 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 167.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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 80, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 167gr | MRR Green Hunting 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.