Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Atomic 29 HP bullet and 61 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>> | 90% | 57,551 psi | 90% | 3255 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,854 psi | 88% | 3363 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 88% | 56,942 psi | 89% | 3369 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 86% | 55,448 psi | 87% | 3294 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 53,824 psi | 84% | 3304 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 56,289 psi | 88% | 3337 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3366 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,926 psi | 86% | 3353 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,521 psi | 87% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,969 psi | 86% | 3281 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,186 psi | 85% | 3297 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,782 psi | 87% | 3264 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,159 psi | 88% | 3337 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,550 psi | 89% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,273 psi | 85% | 3350 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,868 psi | 86% | 3258 fps | 97.2% |
| Bofors RP15 | <<locked>> | 92% | 57,217 psi | 90% | 3346 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,796 psi | 87% | 3343 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 54,186 psi | 85% | 3297 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 53,838 psi | 84% | 3294 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 56,826 psi | 89% | 3297 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,811 psi | 87% | 3281 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,666 psi | 87% | 3202 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,216 psi | 87% | 3428 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 59% | 2142 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,711 psi | 90% | 3271 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,549 psi | 85% | 3215 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,203 psi | 90% | 3274 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 90% | 55,956 psi | 88% | 3346 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,995 psi | 78% | 3248 fps | 98.9% |
| Lovex S070 | <<locked>> | 82% | 56,202 psi | 88% | 3245 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,434 psi | 87% | 3222 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,303 psi | 87% | 3271 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 50,807 psi | 80% | 3278 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 54,230 psi | 85% | 3317 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,173 psi | 88% | 3264 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,217 psi | 90% | 3373 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 55,216 psi | 87% | 3268 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,738 psi | 87% | 3291 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 2195 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,116 psi | 90% | 3337 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,289 psi | 88% | 3412 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,463 psi | 87% | 3363 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 55,970 psi | 88% | 3261 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 54,650 psi | 86% | 3271 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,202 psi | 88% | 3245 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,768 psi | 89% | 3192 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,259 psi | 85% | 3268 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 57,725 psi | 90% | 3248 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 57,508 psi | 90% | 3264 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,998 psi | 86% | 3235 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,911 psi | 86% | 3219 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 56,971 psi | 89% | 3255 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,479 psi | 90% | 3294 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,609 psi | 90% | 3383 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 92% | 54,360 psi | 85% | 3294 fps | 99% |
| Vihtavuori N568 | <<locked>> | 96% | 56,159 psi | 88% | 3373 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 57,305 psi | 90% | 3435 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,595 psi | 90% | 3196 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,695 psi | 87% | 3356 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,013 psi | 86% | 3232 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,582 psi | 64% | 2940 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 44,904 psi | 70% | 3143 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 80% | 42,337 psi | 66% | 3068 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 44,976 psi | 70% | 3091 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 40,292 psi | 63% | 3012 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 86% | 36,796 psi | 58% | 2917 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 48,965 psi | 77% | 3281 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 31,198 psi | 49% | 2795 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,895 psi | 81% | 3228 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,918 psi | 70% | 3084 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,872 psi | 64% | 3018 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,595 psi | 62% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,040 psi | 53% | 2874 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,802 psi | 70% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,082 psi | 78% | 3268 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,051 psi | 75% | 3123 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,898 psi | 59% | 2943 fps | 96.3% |
| Bofors RP30 | <<locked>> | 84% | 36,535 psi | 57% | 2927 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 40,872 psi | 64% | 3018 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 84% | 37,463 psi | 59% | 2936 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 42,917 psi | 67% | 3022 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,134 psi | 66% | 3002 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,646 psi | 76% | 3091 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,214 psi | 52% | 2900 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 44% | 1923 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,691 psi | 79% | 3150 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,923 psi | 80% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,063 psi | 69% | 3018 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,928 psi | 61% | 2989 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,550 psi | 59% | 2969 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 52,576 psi | 82% | 3182 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,751 psi | 54% | 2795 fps | 97.9% |
| Norma 204 | <<locked>> | 80% | 51,605 psi | 81% | 3205 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,808 psi | 51% | 2858 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 43,468 psi | 68% | 3100 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 52,446 psi | 82% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,885 psi | 61% | 2995 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 51,619 psi | 81% | 3205 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,838 psi | 55% | 2858 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 45% | 1969 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,040 psi | 83% | 3271 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,474 psi | 51% | 2864 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 43,830 psi | 69% | 3127 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,006 psi | 72% | 3068 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 44,367 psi | 70% | 3068 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 80% | 52,576 psi | 82% | 3182 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,026 psi | 83% | 3133 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,019 psi | 69% | 3064 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 46,905 psi | 74% | 3051 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 50,067 psi | 78% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,817 psi | 70% | 3045 fps | 99% |
| Vihtavuori N165 | <<locked>> | 80% | 39,001 psi | 61% | 2900 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 80% | 53,316 psi | 84% | 3196 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,990 psi | 69% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,279 psi | 68% | 3094 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 84% | 40,930 psi | 64% | 3015 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 44,817 psi | 70% | 3143 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 49,327 psi | 77% | 3278 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,577 psi | 84% | 3136 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,289 psi | 58% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,292 psi | 65% | 2963 fps | 97.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 68 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Atomic 29 HP. Vihtavuori N570 delivers the highest muzzle velocity at 3,435 fps; across all powders the maximum-charge window runs from 2,142 fps to 3,435 fps. Accurate 8700 gives the best case fill at 100 %, and 68 of the 68 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.