Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | NorthFork Bonded Core bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Alliant Reloder-33 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>> | 86% | 54,317 psi | 85% | 3120 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 57,087 psi | 89% | 3287 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 55,303 psi | 87% | 3209 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,696 psi | 90% | 3287 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 56,550 psi | 89% | 3261 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 3386 fps | 98.4% |
| ADI AR 2225 | <<locked>> | 98% | 55,695 psi | 87% | 3284 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,940 psi | 86% | 3199 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,360 psi | 85% | 3219 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,318 psi | 88% | 3182 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,681 psi | 89% | 3258 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,985 psi | 89% | 3271 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,911 psi | 86% | 3284 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 3271 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,578 psi | 86% | 3176 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 57,493 psi | 90% | 3268 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,507 psi | 89% | 3274 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,360 psi | 85% | 3219 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 54,157 psi | 85% | 3219 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,724 psi | 89% | 3215 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,550 psi | 87% | 3196 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,608 psi | 87% | 3114 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,796 psi | 87% | 3350 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 2087 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,377 psi | 90% | 3179 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,869 psi | 89% | 3189 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 56,159 psi | 88% | 3268 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3255 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,115 psi | 88% | 3146 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3281 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,375 psi | 85% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,493 psi | 90% | 3291 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 56,086 psi | 88% | 3212 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 61% | 2139 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,913 psi | 89% | 3337 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,304 psi | 88% | 3294 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 55,709 psi | 87% | 3173 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 54,737 psi | 86% | 3189 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,389 psi | 85% | 3186 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,276 psi | 90% | 3163 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 57,725 psi | 90% | 3176 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,027 psi | 86% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,013 psi | 86% | 3140 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,346 psi | 85% | 3153 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 54,360 psi | 85% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,725 psi | 90% | 3301 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 55,071 psi | 86% | 3225 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,753 psi | 89% | 3301 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 54,041 psi | 85% | 3294 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,637 psi | 89% | 3274 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,868 psi | 86% | 3150 fps | 99.9% |
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% | 44,338 psi | 69% | 2940 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,108 psi | 72% | 3077 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 48,341 psi | 76% | 3081 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 43,497 psi | 68% | 3012 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 82% | 34,751 psi | 54% | 2789 fps | 95% |
| ADI AR 2218 | <<locked>> | 94% | 45,847 psi | 72% | 3140 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 29,791 psi | 47% | 2684 fps | 95.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,240 psi | 76% | 3071 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,266 psi | 69% | 3018 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,091 psi | 68% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,347 psi | 59% | 2887 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,124 psi | 77% | 3140 fps | 100% |
| Alliant Reloder-33 | 113.2 gr | 92% | 47,210 psi | 74% | 3133 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,094 psi | 74% | 3117 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,831 psi | 70% | 2982 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 41,263 psi | 65% | 2949 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 34,882 psi | 55% | 2808 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 44,266 psi | 69% | 3018 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 35,230 psi | 55% | 2808 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 46,064 psi | 72% | 3015 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,237 psi | 71% | 2995 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,054 psi | 82% | 3058 fps | 100% |
| Hodgdon Retumbo | 91.2 gr | 80% | 36,376 psi | 57% | 2927 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1873 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,925 psi | 85% | 3123 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,036 psi | 74% | 3005 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 42,235 psi | 66% | 2992 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,172 psi | 57% | 2858 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 38,101 psi | 60% | 2802 fps | 99.2% |
| Norma 217 | <<locked>> | 84% | 31,647 psi | 50% | 2753 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 47,181 psi | 74% | 3100 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 42,496 psi | 67% | 3009 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 38,377 psi | 60% | 2871 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 46% | 1916 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,882 psi | 56% | 2900 fps | 98.5% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,350 psi | 65% | 2995 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,037 psi | 77% | 3054 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 47,877 psi | 75% | 3061 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,529 psi | 74% | 3058 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 50,140 psi | 79% | 3038 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 54,041 psi | 85% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,196 psi | 76% | 3031 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 42,250 psi | 66% | 2900 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 50,691 psi | 79% | 3087 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 47,732 psi | 75% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,789 psi | 73% | 3094 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 38,928 psi | 61% | 2890 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 42,395 psi | 66% | 3015 fps | 95.8% |
| Vihtavuori N570 | 106.5 gr | 90% | 46,586 psi | 73% | 3143 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,626 psi | 65% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,483 psi | 70% | 2959 fps | 98.8% |
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 | 165gr | NorthFork Bonded Core. ADI AR 2218 delivers the highest muzzle velocity at 3,386 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,386 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 165.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, 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. Vihtavuori N570, Alliant Reloder-33, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | NorthFork Bonded Core they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, 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.