Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Sierra Tipped MatchKing bullet and 51 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% | 54,389 psi | 85% | 3097 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,072 psi | 88% | 3261 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 86% | 57,232 psi | 90% | 3271 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 55,347 psi | 87% | 3186 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 53,896 psi | 84% | 3202 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,652 psi | 89% | 3238 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3363 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 55,840 psi | 88% | 3264 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,969 psi | 86% | 3176 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,433 psi | 85% | 3196 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,376 psi | 88% | 3159 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,869 psi | 89% | 3238 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,130 psi | 90% | 3251 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,114 psi | 86% | 3271 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,926 psi | 86% | 3255 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,563 psi | 86% | 3156 fps | 97.9% |
| Bofors RP15 | <<locked>> | 90% | 57,624 psi | 90% | 3248 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,695 psi | 89% | 3255 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,433 psi | 85% | 3196 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 54,215 psi | 85% | 3199 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,811 psi | 89% | 3192 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,622 psi | 87% | 3176 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,724 psi | 87% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,985 psi | 88% | 3333 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 2067 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,493 psi | 90% | 3159 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,043 psi | 89% | 3169 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 56,275 psi | 88% | 3248 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,795 psi | 86% | 3238 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,217 psi | 88% | 3123 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3261 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,462 psi | 85% | 3212 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,682 psi | 90% | 3274 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 56,159 psi | 88% | 3192 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 61% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,058 psi | 89% | 3317 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,318 psi | 88% | 3274 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 55,869 psi | 88% | 3156 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 54,795 psi | 86% | 3169 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,418 psi | 85% | 3163 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,392 psi | 90% | 3146 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 55,201 psi | 87% | 3136 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,114 psi | 86% | 3120 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,404 psi | 85% | 3136 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 54,534 psi | 85% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 53,911 psi | 84% | 3212 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,071 psi | 86% | 3205 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,695 psi | 89% | 3278 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 54,114 psi | 85% | 3274 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,811 psi | 89% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,969 psi | 86% | 3130 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,338 psi | 69% | 2920 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 48,834 psi | 77% | 3127 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,180 psi | 72% | 3058 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 48,457 psi | 76% | 3061 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 43,613 psi | 68% | 2995 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 34,838 psi | 55% | 2776 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 94% | 45,992 psi | 72% | 3123 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 29,863 psi | 47% | 2671 fps | 96.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,211 psi | 76% | 3051 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,396 psi | 70% | 3002 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,178 psi | 68% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,463 psi | 59% | 2871 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,240 psi | 77% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,326 psi | 74% | 3117 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,108 psi | 74% | 3100 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,889 psi | 70% | 2963 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,365 psi | 65% | 2933 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 34,882 psi | 55% | 2792 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 44,396 psi | 70% | 3002 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 35,346 psi | 55% | 2792 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,209 psi | 72% | 2995 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,368 psi | 71% | 2979 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,156 psi | 82% | 3038 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,492 psi | 57% | 2910 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,041 psi | 85% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,137 psi | 74% | 2989 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,337 psi | 66% | 2976 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,245 psi | 57% | 2844 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,261 psi | 60% | 2789 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 29,617 psi | 46% | 2674 fps | 95% |
| Norma MRP | <<locked>> | 80% | 47,369 psi | 74% | 3084 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 42,656 psi | 67% | 2992 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 38,406 psi | 60% | 2854 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,969 psi | 56% | 2884 fps | 98.6% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,377 psi | 60% | 2904 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,139 psi | 77% | 3035 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 47,979 psi | 75% | 3045 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,630 psi | 75% | 3038 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 50,154 psi | 79% | 3018 fps | 98.6% |
| Somchem S385 | <<locked>> | 80% | 48,341 psi | 76% | 3015 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,221 psi | 66% | 2881 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 50,894 psi | 80% | 3071 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 47,819 psi | 75% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,978 psi | 74% | 3074 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 39,073 psi | 61% | 2877 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 86% | 42,540 psi | 67% | 2999 fps | 96% |
| Vihtavuori N570 | <<locked>> | 90% | 46,775 psi | 73% | 3127 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,800 psi | 66% | 3002 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,643 psi | 70% | 2940 fps | 99% |
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 Tipped MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,363 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,363 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.