Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 170gr | Sako Blade bullet and 57 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,390 psi | 87% | 3100 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,665 psi | 86% | 3212 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 57,014 psi | 89% | 3199 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,550 psi | 87% | 3215 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 54,099 psi | 85% | 3182 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 3301 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3268 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,130 psi | 90% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,550 psi | 89% | 3186 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,883 psi | 88% | 3209 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,653 psi | 90% | 3166 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,244 psi | 85% | 3186 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,244 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,318 psi | 88% | 3278 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 3182 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,333 psi | 88% | 3173 fps | 98.2% |
| Bofors RP15 | <<locked>> | 90% | 55,085 psi | 86% | 3192 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 53,925 psi | 85% | 3196 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 55,883 psi | 88% | 3209 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,695 psi | 87% | 3209 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,621 psi | 86% | 3143 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,406 psi | 90% | 3189 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,290 psi | 90% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,319 psi | 90% | 3340 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 2047 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,622 psi | 87% | 3114 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,173 psi | 88% | 3117 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,056 psi | 86% | 3120 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 57,711 psi | 90% | 3258 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,909 psi | 81% | 3176 fps | 99.6% |
| Lovex S070 | <<locked>> | 82% | 57,667 psi | 90% | 3146 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,174 psi | 90% | 3127 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,942 psi | 89% | 3176 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,895 psi | 83% | 3202 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,869 psi | 88% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,998 psi | 86% | 3215 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 56,884 psi | 89% | 3173 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,653 psi | 90% | 3205 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 2093 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,027 psi | 85% | 3258 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,609 psi | 90% | 3287 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 57,566 psi | 90% | 3169 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 56,231 psi | 88% | 3176 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,667 psi | 90% | 3146 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,840 psi | 88% | 3176 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,245 psi | 87% | 3094 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 55,535 psi | 87% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,608 psi | 89% | 3146 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,565 psi | 89% | 3130 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,782 psi | 87% | 3146 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 86% | 55,579 psi | 87% | 3140 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,376 psi | 87% | 3225 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 56,130 psi | 88% | 3212 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 53,867 psi | 84% | 3219 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 55,259 psi | 87% | 3287 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,708 psi | 84% | 3199 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,521 psi | 89% | 3143 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% | 42,047 psi | 66% | 2861 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 43,918 psi | 69% | 2999 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 46,470 psi | 73% | 3009 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 41,655 psi | 65% | 2940 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 35,505 psi | 56% | 2785 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 46,905 psi | 74% | 3133 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 82% | 30,095 psi | 47% | 2671 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,505 psi | 84% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,398 psi | 73% | 3002 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,279 psi | 66% | 2946 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,060 psi | 64% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,404 psi | 55% | 2808 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,514 psi | 73% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 44,483 psi | 70% | 3045 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,543 psi | 75% | 3104 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,137 psi | 72% | 2976 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 39,276 psi | 62% | 2874 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 35,331 psi | 55% | 2795 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,279 psi | 66% | 2946 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 33,518 psi | 53% | 2730 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 44,280 psi | 69% | 2943 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,453 psi | 68% | 2927 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,096 psi | 79% | 2992 fps | 100% |
| Hodgdon Retumbo | 88 gr | 80% | 34,476 psi | 54% | 2844 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,112 psi | 82% | 3058 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,533 psi | 82% | 3058 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,353 psi | 71% | 2936 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 40,422 psi | 63% | 2923 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,477 psi | 57% | 2841 fps | 95.9% |
| Lovex S070 | <<locked>> | 80% | 54,012 psi | 85% | 3087 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,013 psi | 56% | 2723 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 53,055 psi | 83% | 3110 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 29,617 psi | 46% | 2667 fps | 95% |
| Norma MRP | <<locked>> | 80% | 45,005 psi | 71% | 3022 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 40,350 psi | 63% | 2930 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 53,098 psi | 83% | 3110 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,158 psi | 57% | 2792 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 1877 fps | 100% |
| ReloadSwiss RS 76 | 94.2 gr | 80% | 33,721 psi | 53% | 2812 fps | 97.8% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 38,856 psi | 61% | 2907 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 47,224 psi | 74% | 2982 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 45,861 psi | 72% | 2989 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 54,012 psi | 85% | 3087 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,527 psi | 71% | 2982 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 48,269 psi | 76% | 2969 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 51,793 psi | 81% | 3051 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,195 psi | 72% | 2963 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 40,364 psi | 63% | 2828 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 92% | 52,011 psi | 82% | 3077 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 45,498 psi | 71% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,759 psi | 70% | 3018 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 36,869 psi | 58% | 2812 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 86% | 40,059 psi | 63% | 2930 fps | 95.1% |
| Vihtavuori N570 | 105.1 gr | 92% | 47,572 psi | 75% | 3133 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,059 psi | 61% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,670 psi | 67% | 2887 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 64 powders for .30-378 Weath. Mag. loaded with the .308 | 170gr | Sako Blade. Hodgdon Retumbo delivers the highest muzzle velocity at 3,340 fps; across all powders the maximum-charge window runs from 2,047 fps to 3,340 fps. Accurate 8700 gives the best case fill at 100 %, and 64 of the 64 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 170.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 170gr | Sako Blade they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, 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.