Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | 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>> | 86% | 55,376 psi | 87% | 3114 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,290 psi | 90% | 3281 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 54,389 psi | 85% | 3219 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 56,347 psi | 88% | 3205 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,013 psi | 86% | 3219 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 54,056 psi | 85% | 3196 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,520 psi | 85% | 3310 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 98% | 57,087 psi | 89% | 3281 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,927 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,550 psi | 87% | 3215 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,406 psi | 90% | 3176 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,143 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,273 psi | 85% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,434 psi | 88% | 3294 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3278 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,579 psi | 87% | 3176 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 54,926 psi | 86% | 3202 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,143 psi | 85% | 3209 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,550 psi | 87% | 3215 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,448 psi | 87% | 3215 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,696 psi | 90% | 3209 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,724 psi | 89% | 3192 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,637 psi | 89% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,276 psi | 90% | 3350 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 59% | 2077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,317 psi | 85% | 3123 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 57,276 psi | 90% | 3264 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,043 psi | 88% | 3258 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 57,319 psi | 90% | 3143 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3284 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,637 psi | 87% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,607 psi | 86% | 3222 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 57,421 psi | 90% | 3212 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 61% | 2123 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,157 psi | 85% | 3268 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,563 psi | 84% | 3225 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 56,826 psi | 89% | 3173 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,767 psi | 87% | 3186 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,390 psi | 87% | 3179 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,621 psi | 86% | 3100 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,173 psi | 88% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,173 psi | 88% | 3136 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,405 psi | 87% | 3153 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 55,593 psi | 87% | 3150 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,013 psi | 86% | 3232 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 56,289 psi | 88% | 3228 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 54,070 psi | 85% | 3232 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,347 psi | 87% | 3297 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,954 psi | 85% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,028 psi | 88% | 3150 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,252 psi | 71% | 2936 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,705 psi | 78% | 3143 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 47,094 psi | 74% | 3077 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,284 psi | 77% | 3077 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 44,556 psi | 70% | 3018 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 35,505 psi | 56% | 2795 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 94% | 47,065 psi | 74% | 3150 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 30,574 psi | 48% | 2694 fps | 96.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,168 psi | 77% | 3071 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,339 psi | 71% | 3022 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,063 psi | 69% | 2953 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,261 psi | 60% | 2890 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,270 psi | 79% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,976 psi | 70% | 3064 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,486 psi | 76% | 3127 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,542 psi | 71% | 2979 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,163 psi | 66% | 2953 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 35,752 psi | 56% | 2812 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,339 psi | 71% | 3022 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 36,129 psi | 57% | 2812 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,079 psi | 74% | 3015 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,253 psi | 72% | 2999 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,055 psi | 83% | 3051 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,376 psi | 59% | 2936 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1860 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,848 psi | 75% | 3002 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 43,323 psi | 68% | 2999 fps | 97.9% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,621 psi | 54% | 2799 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 38,957 psi | 61% | 2802 fps | 99.5% |
| Norma 217 | <<locked>> | 82% | 30,327 psi | 48% | 2690 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 48,240 psi | 76% | 3097 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,526 psi | 68% | 3009 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 80% | 39,291 psi | 62% | 2874 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 46% | 1906 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,782 psi | 58% | 2904 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,450 psi | 62% | 2927 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 49,922 psi | 78% | 3051 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 48,820 psi | 77% | 3061 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,486 psi | 76% | 3054 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,981 psi | 80% | 3035 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 49,255 psi | 77% | 3031 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,091 psi | 68% | 2900 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 51,924 psi | 81% | 3091 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 48,747 psi | 76% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,790 psi | 75% | 3094 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 39,798 psi | 62% | 2890 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 40,451 psi | 63% | 2946 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 90% | 47,964 psi | 75% | 3153 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,786 psi | 67% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,368 psi | 71% | 2956 fps | 99.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 168gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,350 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 168.0 gr projectile in 0.308" calls for a 1:13.5 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.