Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 185gr | RWS Evolution bullet and 53 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% | 54,505 psi | 85% | 2972 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,690 psi | 78% | 2999 fps | 97.1% |
| Accurate High Country | <<locked>> | 82% | 56,463 psi | 88% | 3136 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,319 psi | 90% | 3146 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 55,259 psi | 87% | 3058 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,056 psi | 85% | 3077 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 57,377 psi | 90% | 3123 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,766 psi | 84% | 3182 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 56,724 psi | 89% | 3143 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,463 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,911 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,665 psi | 86% | 3071 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,608 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,464 psi | 90% | 3114 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,653 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,898 psi | 88% | 3166 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,985 psi | 88% | 3156 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,433 psi | 85% | 3038 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 54,230 psi | 85% | 3068 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,334 psi | 90% | 3140 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,665 psi | 86% | 3071 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,708 psi | 86% | 3081 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,550 psi | 89% | 3068 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,564 psi | 87% | 3051 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,072 psi | 89% | 3209 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 59% | 1982 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,753 psi | 89% | 3045 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,579 psi | 89% | 3127 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,347 psi | 87% | 2989 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,709 psi | 87% | 3127 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,478 psi | 89% | 3002 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,145 psi | 90% | 3150 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,853 psi | 86% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,969 psi | 85% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,536 psi | 89% | 3074 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,044 psi | 61% | 2031 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,679 psi | 84% | 3130 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,029 psi | 89% | 3163 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,564 psi | 87% | 3028 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,752 psi | 86% | 3041 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,721 psi | 81% | 3012 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,389 psi | 85% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,072 psi | 89% | 3022 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,027 psi | 86% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,143 psi | 86% | 2999 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,505 psi | 85% | 3025 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 54,723 psi | 86% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,230 psi | 85% | 3091 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,564 psi | 87% | 3091 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,377 psi | 90% | 3166 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,955 psi | 86% | 3169 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,679 psi | 84% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,795 psi | 86% | 3005 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% | 47,659 psi | 75% | 2861 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 42,844 psi | 67% | 2861 fps | 95% |
| Accurate High Country | <<locked>> | 80% | 52,605 psi | 82% | 3071 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,908 psi | 78% | 3015 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 51,721 psi | 81% | 2999 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,050 psi | 74% | 2949 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,099 psi | 55% | 2680 fps | 96.6% |
| ADI AR 2218 | 107.6 gr | 90% | 43,062 psi | 67% | 2953 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 32,474 psi | 51% | 2651 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,996 psi | 81% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,503 psi | 81% | 2992 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,834 psi | 75% | 2953 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,615 psi | 73% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,698 psi | 64% | 2822 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,403 psi | 84% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,336 psi | 65% | 2874 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,715 psi | 70% | 2940 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,759 psi | 70% | 2851 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 44,469 psi | 70% | 2884 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 38,029 psi | 60% | 2759 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 47,834 psi | 75% | 2953 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,290 psi | 60% | 2762 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 49,472 psi | 78% | 2943 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,573 psi | 76% | 2927 fps | 99% |
| Hodgdon Retumbo | 90.3 gr | 80% | 39,827 psi | 62% | 2884 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,572 psi | 45% | 1775 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,937 psi | 78% | 2927 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 45,847 psi | 72% | 2933 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 51,895 psi | 81% | 2930 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,184 psi | 50% | 2625 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,104 psi | 64% | 2736 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,356 psi | 48% | 2589 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 51,053 psi | 80% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,427 psi | 73% | 2949 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 41,945 psi | 66% | 2818 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,269 psi | 46% | 1818 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,305 psi | 62% | 2858 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,201 psi | 57% | 2740 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 52,127 psi | 82% | 2969 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,285 psi | 80% | 2982 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,020 psi | 71% | 2881 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,952 psi | 80% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,359 psi | 84% | 2959 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,663 psi | 81% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,310 psi | 71% | 2828 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 47,616 psi | 75% | 2897 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 51,300 psi | 80% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,488 psi | 79% | 3025 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 42,206 psi | 66% | 2835 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 37,347 psi | 59% | 2762 fps | 95.2% |
| Vihtavuori N570 | 100.7 gr | 86% | 44,150 psi | 69% | 2956 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,064 psi | 72% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,863 psi | 75% | 2887 fps | 99.8% |
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 53 powders for .30-378 Weath. Mag. loaded with the .308 | 185gr | RWS Evolution. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,209 fps. Accurate 8700 gives the best case fill at 100 %, and 53 of the 53 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 185.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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 | 185gr | RWS Evolution 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.