Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC 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% | 55,811 psi | 87% | 3264 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,653 psi | 90% | 3432 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,636 psi | 86% | 3363 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 56,942 psi | 89% | 3363 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,434 psi | 87% | 3369 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 54,230 psi | 85% | 3337 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 3442 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3425 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,927 psi | 89% | 3356 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,478 psi | 89% | 3346 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,912 psi | 88% | 3366 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,595 psi | 90% | 3327 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,114 psi | 85% | 3343 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,375 psi | 85% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,608 psi | 89% | 3428 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,231 psi | 88% | 3320 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 55,274 psi | 87% | 3353 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 54,012 psi | 85% | 3346 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 55,912 psi | 88% | 3366 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,593 psi | 87% | 3360 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,578 psi | 86% | 3294 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,363 psi | 90% | 3343 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,087 psi | 89% | 3264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,014 psi | 89% | 3494 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,535 psi | 87% | 3274 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,231 psi | 88% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,042 psi | 86% | 3278 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 57,566 psi | 90% | 3415 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3327 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,609 psi | 90% | 3310 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,464 psi | 90% | 3291 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,797 psi | 89% | 3337 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3356 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,999 psi | 88% | 3383 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,624 psi | 90% | 3327 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,795 psi | 86% | 3366 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,811 psi | 89% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,638 psi | 90% | 3360 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,566 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,114 psi | 85% | 3412 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,548 psi | 84% | 3360 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,421 psi | 90% | 3323 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,289 psi | 88% | 3337 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,609 psi | 90% | 3310 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,898 psi | 88% | 3333 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,405 psi | 87% | 3248 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,506 psi | 87% | 3274 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,594 psi | 89% | 3304 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,652 psi | 89% | 3284 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,767 psi | 87% | 3304 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,419 psi | 87% | 3379 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,376 psi | 88% | 3369 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 54,143 psi | 85% | 3366 fps | 98% |
| Vihtavuori N570 | <<locked>> | 96% | 55,245 psi | 87% | 3432 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,577 psi | 84% | 3356 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,608 psi | 89% | 3297 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,467 psi | 67% | 3012 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 46,528 psi | 73% | 3212 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 44,019 psi | 69% | 3140 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,470 psi | 73% | 3159 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,727 psi | 65% | 3081 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 38,116 psi | 60% | 2982 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 50,821 psi | 80% | 3356 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 32,590 psi | 51% | 2871 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,214 psi | 83% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,398 psi | 73% | 3150 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,453 psi | 67% | 3091 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,075 psi | 64% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,592 psi | 56% | 2949 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,659 psi | 73% | 3215 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,443 psi | 76% | 3268 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,313 psi | 77% | 3186 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,392 psi | 62% | 3015 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 38,159 psi | 60% | 2999 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 42,453 psi | 67% | 3091 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,216 psi | 57% | 2933 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 44,338 psi | 69% | 3087 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,569 psi | 68% | 3071 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,053 psi | 78% | 3153 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,722 psi | 54% | 2979 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 44% | 1965 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,127 psi | 82% | 3212 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,518 psi | 82% | 3219 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,411 psi | 71% | 3084 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,437 psi | 63% | 3061 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,436 psi | 62% | 3048 fps | 95.9% |
| Lovex S070 | <<locked>> | 80% | 54,056 psi | 85% | 3248 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,477 psi | 57% | 2871 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 53,040 psi | 83% | 3271 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,140 psi | 50% | 2864 fps | 95% |
| Norma MRP | <<locked>> | 80% | 45,078 psi | 71% | 3173 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 53,969 psi | 85% | 3268 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,408 psi | 63% | 3068 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 53,098 psi | 83% | 3271 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,405 psi | 57% | 2927 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 2011 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,026 psi | 53% | 2943 fps | 96.8% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,380 psi | 66% | 3123 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 47,181 psi | 74% | 3130 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,847 psi | 72% | 3136 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 54,056 psi | 85% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,498 psi | 71% | 3133 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 48,327 psi | 76% | 3117 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,851 psi | 81% | 3215 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,441 psi | 73% | 3114 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,538 psi | 64% | 2969 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 45,643 psi | 72% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,773 psi | 70% | 3159 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,914 psi | 63% | 3022 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 43,497 psi | 68% | 3143 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 94% | 51,387 psi | 81% | 3353 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,175 psi | 61% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,801 psi | 67% | 3031 fps | 97.8% |
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 | 150gr | Alaska Bullet Works Kodiak SP SPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,494 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,494 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 150.0 gr projectile in 0.308" calls for a 1:15.5 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.