Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 185gr | Berger Hybrid Target bullet and 51 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 Alliant Reloder-33.
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% | 57,319 psi | 90% | 3015 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,602 psi | 76% | 2976 fps | 96.8% |
| Accurate High Country | <<locked>> | 82% | 55,390 psi | 87% | 3120 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 56,492 psi | 89% | 3133 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 54,505 psi | 85% | 3045 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,101 psi | 89% | 3130 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,144 psi | 88% | 3107 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,840 psi | 89% | 3241 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 96% | 55,680 psi | 87% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,215 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,624 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,883 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,391 psi | 88% | 3100 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,521 psi | 89% | 3110 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,665 psi | 86% | 3146 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,592 psi | 86% | 3133 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,232 psi | 90% | 3084 fps | 99% |
| Bofors RP15 | <<locked>> | 88% | 56,985 psi | 89% | 3110 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,333 psi | 88% | 3120 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,624 psi | 90% | 3120 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 53,679 psi | 84% | 3064 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,738 psi | 87% | 3054 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,737 psi | 86% | 3038 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,869 psi | 88% | 3196 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 1978 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,956 psi | 88% | 3031 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 55,521 psi | 87% | 3110 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,563 psi | 86% | 3110 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,608 psi | 87% | 2992 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,912 psi | 88% | 3133 fps | 100% |
| Norma MRP | <<locked>> | 82% | 53,780 psi | 84% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,913 psi | 89% | 3133 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,376 psi | 87% | 3058 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 2024 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,666 psi | 89% | 3179 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,927 psi | 88% | 3150 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 54,897 psi | 86% | 3015 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 57,696 psi | 90% | 3087 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2992 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,319 psi | 90% | 3084 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,188 psi | 88% | 3005 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,331 psi | 85% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,360 psi | 85% | 2986 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,421 psi | 90% | 3074 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 84% | 57,566 psi | 90% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,159 psi | 90% | 3143 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 54,578 psi | 86% | 3077 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 56,231 psi | 88% | 3150 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 53,795 psi | 84% | 3153 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,521 psi | 89% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 53,954 psi | 85% | 2992 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% | 46,949 psi | 74% | 2851 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,165 psi | 71% | 2910 fps | 95.8% |
| Accurate High Country | <<locked>> | 80% | 51,663 psi | 81% | 3058 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,052 psi | 77% | 2999 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 50,981 psi | 80% | 2986 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,195 psi | 72% | 2933 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 34,505 psi | 54% | 2664 fps | 96.3% |
| ADI AR 2218 | 106 gr | 90% | 42,192 psi | 66% | 2933 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,894 psi | 50% | 2638 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,807 psi | 80% | 2979 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,949 psi | 74% | 2936 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,832 psi | 72% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,958 psi | 63% | 2812 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,446 psi | 82% | 3045 fps | 100% |
| Alliant Reloder-33 | 105.6 gr | 88% | 43,642 psi | 68% | 2927 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 92% | 43,758 psi | 69% | 2920 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,092 psi | 69% | 2838 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 43,758 psi | 69% | 2871 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 37,347 psi | 59% | 2746 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 46,949 psi | 74% | 2936 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,637 psi | 59% | 2746 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 48,646 psi | 76% | 2927 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,761 psi | 75% | 2913 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,073 psi | 61% | 2867 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,471 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,269 psi | 77% | 2913 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,107 psi | 71% | 2920 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,866 psi | 53% | 2677 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 40,538 psi | 64% | 2726 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,704 psi | 47% | 2575 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 50,169 psi | 79% | 3009 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,658 psi | 72% | 2936 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,118 psi | 64% | 2802 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,283 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,522 psi | 60% | 2841 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,476 psi | 56% | 2723 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 51,416 psi | 81% | 2956 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 50,517 psi | 79% | 2969 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,150 psi | 69% | 2864 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,212 psi | 79% | 2966 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,649 psi | 83% | 2946 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 50,807 psi | 80% | 2940 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,628 psi | 70% | 2815 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 46,949 psi | 74% | 2884 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 50,647 psi | 79% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,647 psi | 78% | 3012 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 41,553 psi | 65% | 2825 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 39,305 psi | 62% | 2812 fps | 95.9% |
| Vihtavuori N570 | 99.3 gr | 86% | 43,366 psi | 68% | 2940 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,179 psi | 71% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,065 psi | 74% | 2871 fps | 99.7% |
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 51 powders for .30-378 Weath. Mag. loaded with the .308 | 185gr | Berger Hybrid Target. ADI AR 2218 delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,241 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 1:11.0 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, Alliant Reloder-33 rank at the top here: for .30-378 Weath. Mag. with the .308 | 185gr | Berger Hybrid Target 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.