Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Sierra MatchKing bullet and 54 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>> | 88% | 56,710 psi | 89% | 3235 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,650 psi | 86% | 3337 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 55,738 psi | 87% | 3346 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 84% | 54,128 psi | 85% | 3271 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 56,333 psi | 88% | 3346 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 55,230 psi | 87% | 3317 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 3432 fps | 97.7% |
| ADI AR 2225 | <<locked>> | 98% | 54,143 psi | 85% | 3340 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,392 psi | 90% | 3320 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,797 psi | 89% | 3340 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,897 psi | 86% | 3245 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,303 psi | 87% | 3320 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,608 psi | 87% | 3333 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,740 psi | 90% | 3412 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 3310 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,058 psi | 89% | 3297 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 56,144 psi | 88% | 3327 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 55,172 psi | 86% | 3330 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 56,797 psi | 89% | 3340 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 56,695 psi | 89% | 3340 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 55,361 psi | 87% | 3268 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,433 psi | 85% | 3255 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,418 psi | 85% | 3179 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,230 psi | 85% | 3406 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2156 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,347 psi | 88% | 3248 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,116 psi | 90% | 3251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,898 psi | 88% | 3251 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 54,781 psi | 86% | 3323 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3307 fps | 99.4% |
| Lovex S071 | <<locked>> | 92% | 54,926 psi | 86% | 3209 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,740 psi | 90% | 3310 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 3337 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,956 psi | 89% | 3360 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,043 psi | 88% | 3350 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 54,549 psi | 85% | 3268 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 2201 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,376 psi | 87% | 3392 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,752 psi | 86% | 3343 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 54,650 psi | 86% | 3238 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 57,290 psi | 90% | 3314 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,884 psi | 89% | 3310 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,144 psi | 88% | 3222 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 56,478 psi | 89% | 3245 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,580 psi | 90% | 3278 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,522 psi | 90% | 3258 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,942 psi | 89% | 3274 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 56,797 psi | 89% | 3278 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,347 psi | 88% | 3360 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 92% | 57,435 psi | 90% | 3346 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 55,259 psi | 87% | 3353 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 96% | 56,463 psi | 88% | 3415 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,795 psi | 86% | 3333 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,609 psi | 90% | 3278 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,236 psi | 68% | 2992 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 47,456 psi | 74% | 3196 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 44,918 psi | 70% | 3127 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 47,239 psi | 74% | 3136 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 42,482 psi | 67% | 3064 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 84% | 36,274 psi | 57% | 2900 fps | 95% |
| ADI AR 2218 | <<locked>> | 96% | 48,109 psi | 75% | 3261 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 82% | 31,096 psi | 49% | 2792 fps | 95.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,166 psi | 74% | 3127 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,236 psi | 68% | 3074 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,989 psi | 66% | 3015 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,318 psi | 57% | 2933 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,703 psi | 75% | 3196 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,530 psi | 78% | 3251 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,255 psi | 77% | 3235 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,920 psi | 74% | 3100 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 40,248 psi | 63% | 2999 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 36,347 psi | 57% | 2917 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 43,236 psi | 68% | 3074 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 82% | 36,927 psi | 58% | 2920 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 45,092 psi | 71% | 3068 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,309 psi | 69% | 3051 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,981 psi | 80% | 3127 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,476 psi | 56% | 2966 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 44% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,866 psi | 83% | 3189 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,490 psi | 84% | 3196 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,093 psi | 72% | 3061 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 41,220 psi | 65% | 3045 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,623 psi | 59% | 2966 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 37,115 psi | 58% | 2851 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 53,911 psi | 84% | 3245 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 32,953 psi | 52% | 2858 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 45,992 psi | 72% | 3153 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 41,292 psi | 65% | 3054 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 80% | 37,246 psi | 58% | 2913 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,964 psi | 45% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,824 psi | 55% | 2936 fps | 97.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 43,482 psi | 68% | 3114 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 48,008 psi | 75% | 3110 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 46,760 psi | 73% | 3120 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,427 psi | 73% | 3114 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 49,066 psi | 77% | 3091 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 52,808 psi | 83% | 3189 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,210 psi | 74% | 3091 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,234 psi | 65% | 2949 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 92% | 53,185 psi | 83% | 3205 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 46,615 psi | 73% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,643 psi | 72% | 3146 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 82% | 40,756 psi | 64% | 3005 fps | 96% |
| Vihtavuori N568 | <<locked>> | 88% | 44,367 psi | 70% | 3130 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 92% | 48,791 psi | 76% | 3264 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,219 psi | 63% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,555 psi | 68% | 3012 fps | 98.3% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 60 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,432 fps; across all powders the maximum-charge window runs from 2,156 fps to 3,432 fps. Accurate 8700 gives the best case fill at 100 %, and 60 of the 60 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 155.0 gr projectile in 0.308" calls for a 1:14.5 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.