Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Sierra Tipped MatchKing bullet and 57 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% | 55,347 psi | 87% | 3219 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,087 psi | 89% | 3383 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,143 psi | 85% | 3317 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 56,550 psi | 89% | 3314 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,824 psi | 86% | 3317 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 57,566 psi | 90% | 3356 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3392 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3379 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,623 psi | 89% | 3304 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,101 psi | 88% | 3297 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,303 psi | 87% | 3314 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,116 psi | 90% | 3281 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,479 psi | 90% | 3356 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 53,925 psi | 85% | 3310 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,796 psi | 87% | 3376 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,782 psi | 87% | 3274 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 54,679 psi | 86% | 3301 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 57,246 psi | 90% | 3366 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 55,303 psi | 87% | 3314 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,085 psi | 86% | 3314 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,143 psi | 85% | 3248 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,782 psi | 89% | 3294 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,681 psi | 89% | 3215 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,405 psi | 88% | 3445 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 59% | 2146 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,201 psi | 87% | 3228 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,840 psi | 88% | 3232 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,723 psi | 86% | 3228 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 57,174 psi | 90% | 3366 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,474 psi | 81% | 3278 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,421 psi | 90% | 3261 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,058 psi | 89% | 3241 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,391 psi | 88% | 3287 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 3307 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,405 psi | 87% | 3333 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,392 psi | 90% | 3281 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,244 psi | 85% | 3320 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,391 psi | 88% | 3284 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,145 psi | 90% | 3314 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 2195 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,638 psi | 90% | 3435 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,087 psi | 89% | 3389 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 57,058 psi | 89% | 3274 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 55,898 psi | 88% | 3291 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,421 psi | 90% | 3261 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,506 psi | 87% | 3287 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,911 psi | 86% | 3199 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,085 psi | 86% | 3228 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,304 psi | 88% | 3258 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,159 psi | 88% | 3238 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,288 psi | 87% | 3258 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,882 psi | 86% | 3333 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 55,840 psi | 88% | 3320 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 57,421 psi | 90% | 3392 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 54,549 psi | 85% | 3383 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,101 psi | 89% | 3376 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,086 psi | 88% | 3248 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,090 psi | 66% | 2969 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 46,079 psi | 72% | 3166 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 43,642 psi | 68% | 3097 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 46,050 psi | 72% | 3114 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 41,394 psi | 65% | 3038 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 37,811 psi | 59% | 2943 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 50,270 psi | 79% | 3307 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 82% | 30,226 psi | 47% | 2762 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,997 psi | 83% | 3248 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,035 psi | 72% | 3104 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,105 psi | 66% | 3048 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,727 psi | 64% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,244 psi | 55% | 2907 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,267 psi | 73% | 3169 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,848 psi | 75% | 3222 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,950 psi | 77% | 3140 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 39,102 psi | 61% | 2976 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 37,768 psi | 59% | 2959 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 42,105 psi | 66% | 3048 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 82% | 35,955 psi | 56% | 2894 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 44,005 psi | 69% | 3045 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,207 psi | 68% | 3025 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,821 psi | 78% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,403 psi | 54% | 2936 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 44% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,706 psi | 81% | 3166 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,228 psi | 82% | 3173 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,063 psi | 71% | 3038 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 40,089 psi | 63% | 3015 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,957 psi | 61% | 3005 fps | 96% |
| Lovex S070 | <<locked>> | 80% | 53,780 psi | 84% | 3202 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,230 psi | 57% | 2828 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 52,721 psi | 83% | 3222 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 31,792 psi | 50% | 2828 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 44,643 psi | 70% | 3127 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 53,650 psi | 84% | 3219 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,132 psi | 63% | 3028 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 52,794 psi | 83% | 3225 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,042 psi | 56% | 2887 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 45% | 1969 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,750 psi | 53% | 2907 fps | 96.9% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,901 psi | 66% | 3084 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 46,905 psi | 74% | 3084 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 45,571 psi | 71% | 3094 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 80% | 53,780 psi | 84% | 3202 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,237 psi | 71% | 3087 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 48,022 psi | 75% | 3071 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 51,401 psi | 81% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,079 psi | 72% | 3068 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,176 psi | 63% | 2927 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 45,295 psi | 71% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,367 psi | 70% | 3117 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 39,552 psi | 62% | 2979 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 42,917 psi | 67% | 3100 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 50,821 psi | 80% | 3307 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,754 psi | 61% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,438 psi | 67% | 2989 fps | 97.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 64 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Sierra Tipped MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,445 fps; across all powders the maximum-charge window runs from 2,146 fps to 3,445 fps. Accurate 8700 gives the best case fill at 100 %, and 64 of the 64 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 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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.