Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 185gr | Berger Classic Hybrid Hunter 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% | 54,520 psi | 85% | 2976 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 2999 fps | 97.1% |
| Accurate High Country | <<locked>> | 82% | 56,478 psi | 89% | 3140 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,508 psi | 90% | 3150 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 55,419 psi | 87% | 3061 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,215 psi | 85% | 3081 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 57,334 psi | 90% | 3123 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,925 psi | 85% | 3189 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 56,884 psi | 89% | 3146 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,637 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,085 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,839 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,826 psi | 89% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,493 psi | 90% | 3114 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,653 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,072 psi | 88% | 3166 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,086 psi | 88% | 3159 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,607 psi | 86% | 3041 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 54,244 psi | 85% | 3068 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,348 psi | 90% | 3140 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,839 psi | 86% | 3077 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,882 psi | 86% | 3084 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,724 psi | 89% | 3071 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,709 psi | 87% | 3054 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,058 psi | 89% | 3212 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 60% | 1985 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,739 psi | 89% | 3045 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,594 psi | 89% | 3127 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,463 psi | 87% | 2995 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,898 psi | 88% | 3133 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,666 psi | 89% | 3005 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,334 psi | 90% | 3153 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,868 psi | 86% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,983 psi | 85% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,536 psi | 89% | 3074 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 2031 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,853 psi | 84% | 3133 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,188 psi | 90% | 3169 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 55,738 psi | 87% | 3031 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,940 psi | 86% | 3045 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 3015 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,578 psi | 86% | 3041 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,043 psi | 89% | 3022 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,172 psi | 86% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,317 psi | 87% | 3002 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,665 psi | 86% | 3031 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 54,897 psi | 86% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,215 psi | 85% | 3094 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,564 psi | 87% | 3094 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,551 psi | 90% | 3169 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,969 psi | 86% | 3169 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,693 psi | 84% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,940 psi | 86% | 3009 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% | 47,819 psi | 75% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 42,960 psi | 67% | 2864 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 52,779 psi | 83% | 3077 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,922 psi | 78% | 3018 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 51,880 psi | 81% | 3002 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,065 psi | 74% | 2949 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,244 psi | 55% | 2684 fps | 96.7% |
| ADI AR 2218 | 107.8 gr | 90% | 43,192 psi | 68% | 2956 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 32,489 psi | 51% | 2651 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,170 psi | 82% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,677 psi | 81% | 2995 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,848 psi | 75% | 2953 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,644 psi | 73% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,857 psi | 64% | 2828 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,592 psi | 84% | 3064 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,466 psi | 65% | 2877 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,846 psi | 70% | 2943 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,744 psi | 70% | 2854 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 44,614 psi | 70% | 2887 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 38,189 psi | 60% | 2766 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 47,848 psi | 75% | 2953 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,290 psi | 60% | 2762 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 49,487 psi | 78% | 2946 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,602 psi | 76% | 2930 fps | 99.1% |
| Hodgdon Retumbo | 90.4 gr | 80% | 39,842 psi | 62% | 2887 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1775 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,082 psi | 78% | 2930 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 45,890 psi | 72% | 2933 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,040 psi | 82% | 2933 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,300 psi | 51% | 2631 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 41,249 psi | 65% | 2740 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,487 psi | 48% | 2595 fps | 96.8% |
| Norma MRP | <<locked>> | 80% | 51,227 psi | 80% | 3028 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,601 psi | 73% | 2956 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 41,930 psi | 66% | 2818 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,327 psi | 46% | 1818 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,465 psi | 62% | 2861 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,332 psi | 57% | 2746 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 52,286 psi | 82% | 2972 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 51,445 psi | 81% | 2986 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,165 psi | 71% | 2887 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,097 psi | 80% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,388 psi | 84% | 2963 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,677 psi | 81% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,455 psi | 71% | 2831 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 47,732 psi | 75% | 2900 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 51,445 psi | 81% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,662 psi | 79% | 3028 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 42,366 psi | 66% | 2841 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 80% | 37,463 psi | 59% | 2766 fps | 95.3% |
| Vihtavuori N570 | 100.9 gr | 86% | 44,338 psi | 69% | 2959 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,253 psi | 72% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,877 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 | Berger Classic Hybrid Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,212 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 60–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.308" calls for a 1:12.5 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 | Berger Classic Hybrid Hunter 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.