Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Impala LW CFN 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% | 55,143 psi | 86% | 3241 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,014 psi | 88% | 3396 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 56,985 psi | 89% | 3399 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 55,085 psi | 86% | 3320 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 88% | 57,145 psi | 90% | 3392 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 56,130 psi | 88% | 3363 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 3474 fps | 97.3% |
| ADI AR 2225 | <<locked>> | 98% | 55,143 psi | 86% | 3392 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,810 psi | 86% | 3307 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,331 psi | 85% | 3330 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,246 psi | 88% | 3301 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,231 psi | 88% | 3369 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,116 psi | 90% | 3396 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,752 psi | 86% | 3389 fps | 96.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,230 psi | 87% | 3386 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,551 psi | 90% | 3337 fps | 97.5% |
| Bofors RP15 | <<locked>> | 90% | 57,319 psi | 90% | 3379 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 56,579 psi | 89% | 3386 fps | 99.6% |
| Bofors RP5 | <<locked>> | 86% | 54,331 psi | 85% | 3330 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 57,508 psi | 90% | 3386 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,449 psi | 88% | 3317 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,332 psi | 87% | 3297 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,680 psi | 87% | 3232 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,303 psi | 87% | 3461 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 59% | 2178 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,203 psi | 90% | 3291 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,623 psi | 89% | 3294 fps | 99% |
| IMR 7828 SSC | <<locked>> | 88% | 55,709 psi | 87% | 3376 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3366 fps | 99.4% |
| Lovex S071 | <<locked>> | 92% | 56,855 psi | 89% | 3268 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 3396 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,389 psi | 85% | 3346 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,884 psi | 89% | 3399 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 90% | 55,825 psi | 87% | 3320 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 61% | 2231 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,376 psi | 88% | 3448 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,086 psi | 88% | 3406 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 55,579 psi | 87% | 3281 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 84% | 54,781 psi | 86% | 3301 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,389 psi | 85% | 3294 fps | 99.6% |
| Somchem S361 | <<locked>> | 84% | 57,232 psi | 90% | 3271 fps | 99% |
| Somchem S385 | <<locked>> | 84% | 55,317 psi | 87% | 3271 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 88% | 55,042 psi | 86% | 3248 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 84% | 54,926 psi | 86% | 3281 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,406 psi | 90% | 3406 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 90% | 55,332 psi | 87% | 3340 fps | 99% |
| Vihtavuori N568 | <<locked>> | 94% | 56,449 psi | 88% | 3406 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 96% | 57,624 psi | 90% | 3471 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,217 psi | 88% | 3399 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,868 psi | 86% | 3258 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,455 psi | 71% | 3061 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 49,008 psi | 77% | 3258 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 46,543 psi | 73% | 3189 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 48,254 psi | 76% | 3189 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 43,671 psi | 68% | 3120 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 84% | 37,797 psi | 59% | 2963 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 96% | 49,385 psi | 77% | 3314 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,922 psi | 48% | 2805 fps | 95.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,283 psi | 76% | 3179 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,730 psi | 70% | 3136 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,627 psi | 68% | 3077 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,884 psi | 59% | 3002 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,472 psi | 78% | 3264 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 50,865 psi | 80% | 3314 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 51,329 psi | 80% | 3307 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,805 psi | 75% | 3143 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 41,742 psi | 65% | 3064 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 38,232 psi | 60% | 2995 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 44,730 psi | 70% | 3136 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 80% | 35,984 psi | 56% | 2917 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 46,311 psi | 73% | 3120 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,513 psi | 71% | 3104 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,272 psi | 82% | 3179 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,086 psi | 58% | 3041 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,751 psi | 84% | 3232 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,108 psi | 74% | 3107 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 42,496 psi | 67% | 3100 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,450 psi | 62% | 3045 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 39,610 psi | 62% | 2933 fps | 99% |
| Norma 217 | <<locked>> | 84% | 32,851 psi | 51% | 2881 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 47,543 psi | 75% | 3215 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 42,772 psi | 67% | 3117 fps | 97% |
| Ramshot Magnum | <<locked>> | 80% | 39,001 psi | 61% | 2986 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,327 psi | 46% | 2005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,724 psi | 58% | 3018 fps | 97.9% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,061 psi | 66% | 3114 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,081 psi | 77% | 3156 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 48,109 psi | 75% | 3176 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,747 psi | 75% | 3169 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 50,401 psi | 79% | 3143 fps | 97.8% |
| Somchem S385 | <<locked>> | 80% | 48,805 psi | 76% | 3150 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 42,728 psi | 67% | 3009 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,617 psi | 76% | 3169 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,036 psi | 74% | 3205 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,972 psi | 63% | 3012 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 45,905 psi | 72% | 3192 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 92% | 50,096 psi | 79% | 3323 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,930 psi | 66% | 3146 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,991 psi | 71% | 3068 fps | 98.3% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 57 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Impala LW CFN. ADI AR 2218 delivers the highest muzzle velocity at 3,474 fps; across all powders the maximum-charge window runs from 2,178 fps to 3,474 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 150.0 gr projectile in 0.308" calls for a 1:13.0 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.