Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 190gr | Sierra MatchKing 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>> | 84% | 55,317 psi | 87% | 2953 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,807 psi | 80% | 2989 fps | 97.6% |
| Accurate High Country | <<locked>> | 82% | 57,392 psi | 90% | 3120 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 54,476 psi | 85% | 3068 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 56,173 psi | 88% | 3041 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,071 psi | 86% | 3061 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 54,476 psi | 85% | 3048 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,882 psi | 86% | 3176 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 54,056 psi | 85% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,825 psi | 87% | 3031 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,680 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,682 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,708 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,087 psi | 89% | 3153 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,203 psi | 90% | 3146 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,230 psi | 87% | 3022 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 55,071 psi | 86% | 3048 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,650 psi | 86% | 3061 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,680 psi | 87% | 3058 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,869 psi | 88% | 3064 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,522 psi | 90% | 3048 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,492 psi | 89% | 3035 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,317 psi | 85% | 3133 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 60% | 1959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,435 psi | 90% | 3022 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 57,522 psi | 90% | 3107 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,231 psi | 88% | 2979 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,811 psi | 89% | 3114 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,464 psi | 90% | 2982 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,520 psi | 85% | 3077 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,767 psi | 87% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,984 psi | 86% | 3068 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 57,595 psi | 90% | 3054 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,102 psi | 61% | 2008 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,839 psi | 86% | 3114 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,085 psi | 85% | 3084 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 56,420 psi | 88% | 3009 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,695 psi | 87% | 3022 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,750 psi | 83% | 2999 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,332 psi | 87% | 3018 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,970 psi | 88% | 2989 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,115 psi | 88% | 2979 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,390 psi | 87% | 3012 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 82% | 55,666 psi | 87% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,085 psi | 86% | 3074 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 56,521 psi | 89% | 3074 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 54,563 psi | 86% | 3087 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 56,043 psi | 88% | 3159 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,795 psi | 86% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,753 psi | 87% | 2989 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 48,501 psi | 76% | 2844 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,888 psi | 69% | 2858 fps | 95.8% |
| Accurate High Country | <<locked>> | 80% | 53,621 psi | 84% | 3058 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 50,734 psi | 80% | 2999 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 80% | 52,605 psi | 82% | 2982 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,819 psi | 75% | 2933 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 35,810 psi | 56% | 2671 fps | 97.2% |
| ADI AR 2218 | <<locked>> | 88% | 40,901 psi | 64% | 2874 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 33,185 psi | 52% | 2644 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,373 psi | 82% | 2972 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,573 psi | 76% | 2936 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,355 psi | 74% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,597 psi | 65% | 2812 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 42,351 psi | 66% | 2871 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 90% | 42,525 psi | 67% | 2864 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,368 psi | 71% | 2838 fps | 97% |
| Bofors RP15 | <<locked>> | 80% | 45,310 psi | 71% | 2871 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 38,856 psi | 61% | 2753 fps | 98.1% |
| Bofors RP5 | <<locked>> | 80% | 48,573 psi | 76% | 2936 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 38,928 psi | 61% | 2749 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 80% | 50,169 psi | 79% | 2927 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,269 psi | 77% | 2910 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 80% | 40,712 psi | 64% | 2874 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 45% | 1755 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,676 psi | 79% | 2910 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 46,775 psi | 73% | 2920 fps | 99.4% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,750 psi | 83% | 2917 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,938 psi | 52% | 2621 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 41,843 psi | 66% | 2720 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,140 psi | 49% | 2585 fps | 97.4% |
| Norma MRP | <<locked>> | 80% | 52,054 psi | 82% | 3009 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,442 psi | 74% | 2940 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 42,714 psi | 67% | 2802 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 46% | 1798 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,292 psi | 63% | 2848 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,115 psi | 58% | 2736 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,924 psi | 83% | 2949 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 52,170 psi | 82% | 2966 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 42,859 psi | 67% | 2808 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,822 psi | 81% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,373 psi | 82% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,093 psi | 72% | 2812 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 45,266 psi | 71% | 2822 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 52,185 psi | 82% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,459 psi | 81% | 3012 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 43,076 psi | 68% | 2828 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 80% | 38,189 psi | 60% | 2753 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 84% | 41,945 psi | 66% | 2877 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,210 psi | 74% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,559 psi | 76% | 2867 fps | 99.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 57 powders for .30-378 Weath. Mag. loaded with the .308 | 190gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,176 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 190.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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 50BMG, Hodgdon US 869, 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.