Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 182gr | CutEdge MTAC MAX bullet and 50 powders. The key underlying parameters are shown in the table above.
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% | 54,723 psi | 86% | 3002 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,898 psi | 89% | 3173 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 53,896 psi | 84% | 3114 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 56,188 psi | 88% | 3100 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,737 psi | 86% | 3117 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 57,653 psi | 90% | 3156 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,070 psi | 85% | 3212 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 98% | 56,884 psi | 89% | 3173 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,724 psi | 87% | 3087 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,143 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,101 psi | 89% | 3064 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,638 psi | 90% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,809 psi | 84% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,869 psi | 88% | 3189 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 3173 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,448 psi | 87% | 3077 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 54,708 psi | 86% | 3097 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,435 psi | 90% | 3166 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,143 psi | 86% | 3107 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,230 psi | 87% | 3114 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,435 psi | 90% | 3107 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,376 psi | 88% | 3087 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,420 psi | 88% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,043 psi | 89% | 3241 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,695 psi | 59% | 1988 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,682 psi | 90% | 3081 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 57,087 psi | 89% | 3159 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,564 psi | 87% | 3153 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,608 psi | 89% | 3031 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,869 psi | 89% | 3176 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,230 psi | 87% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,404 psi | 85% | 3120 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 57,014 psi | 89% | 3107 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 2034 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,737 psi | 84% | 3163 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,290 psi | 90% | 3196 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 56,565 psi | 89% | 3068 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 55,463 psi | 87% | 3077 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,114 psi | 86% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,230 psi | 85% | 2999 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 55,680 psi | 87% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,825 psi | 87% | 3031 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,969 psi | 86% | 3054 fps | 97% |
| Vihtavuori N555 | <<locked>> | 84% | 55,027 psi | 86% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,708 psi | 86% | 3127 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 55,724 psi | 87% | 3120 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 94% | 57,537 psi | 90% | 3196 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 94% | 54,955 psi | 86% | 3199 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,592 psi | 84% | 3100 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,695 psi | 87% | 3045 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,527 psi | 70% | 2828 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,313 psi | 77% | 3038 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 46,760 psi | 73% | 2979 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 48,965 psi | 77% | 2976 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,280 psi | 69% | 2920 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 32,764 psi | 51% | 2638 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 92% | 43,163 psi | 68% | 2976 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 29,994 psi | 47% | 2598 fps | 97.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,805 psi | 76% | 2966 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,918 psi | 70% | 2920 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,613 psi | 68% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,768 psi | 59% | 2785 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,792 psi | 78% | 3031 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,425 psi | 70% | 2966 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,034 psi | 69% | 2949 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,482 psi | 67% | 2825 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,771 psi | 65% | 2851 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 35,143 psi | 55% | 2713 fps | 96.4% |
| Bofors RP5 | <<locked>> | 80% | 44,918 psi | 70% | 2920 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 35,694 psi | 56% | 2720 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,659 psi | 73% | 2913 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,934 psi | 72% | 2900 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,678 psi | 83% | 2943 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,956 psi | 58% | 2838 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1778 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,500 psi | 74% | 2904 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 42,975 psi | 67% | 2897 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,084 psi | 53% | 2703 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 38,189 psi | 60% | 2697 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 29,646 psi | 46% | 2595 fps | 96% |
| Norma MRP | <<locked>> | 80% | 47,805 psi | 75% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,323 psi | 68% | 2913 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 80% | 38,841 psi | 61% | 2776 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 46% | 1824 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,260 psi | 57% | 2808 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,754 psi | 61% | 2831 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,661 psi | 78% | 2949 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,385 psi | 76% | 2956 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,037 psi | 75% | 2953 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 50,589 psi | 79% | 2936 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 48,776 psi | 76% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,627 psi | 67% | 2799 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 47,877 psi | 75% | 2923 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 48,167 psi | 75% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,427 psi | 74% | 2992 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 39,276 psi | 62% | 2795 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 39,929 psi | 63% | 2851 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 88% | 44,019 psi | 69% | 2979 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,453 psi | 67% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,020 psi | 71% | 2858 fps | 99.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 182gr | CutEdge MTAC MAX. Hodgdon Retumbo delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,241 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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 182.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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. As outliers, Hodgdon US 869, 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.