Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Alaska Bullet Works Kodiak SP PSPBC bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 54,940 psi | 86% | 3248 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 53,780 psi | 84% | 3346 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 86% | 56,173 psi | 88% | 3346 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 54,520 psi | 85% | 3353 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 57,014 psi | 89% | 3386 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,722 psi | 84% | 3419 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,811 psi | 87% | 3409 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,057 psi | 88% | 3340 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,724 psi | 87% | 3333 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,013 psi | 86% | 3350 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,623 psi | 89% | 3317 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,000 psi | 89% | 3392 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,609 psi | 90% | 3412 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,332 psi | 87% | 3406 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,419 psi | 87% | 3304 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 54,375 psi | 85% | 3337 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 56,898 psi | 89% | 3399 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 55,013 psi | 86% | 3350 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 54,621 psi | 86% | 3346 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 57,508 psi | 90% | 3346 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,507 psi | 89% | 3327 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,391 psi | 88% | 3255 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,999 psi | 88% | 3481 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2182 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,795 psi | 86% | 3264 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,405 psi | 87% | 3268 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,375 psi | 85% | 3261 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,637 psi | 89% | 3399 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,082 psi | 80% | 3307 fps | 98.9% |
| Lovex S070 | <<locked>> | 82% | 57,029 psi | 89% | 3297 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,550 psi | 89% | 3274 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,072 psi | 88% | 3323 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 51,967 psi | 81% | 3337 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 55,056 psi | 86% | 3369 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,956 psi | 89% | 3317 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,824 psi | 84% | 3353 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,072 psi | 88% | 3323 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,594 psi | 89% | 3343 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,435 psi | 60% | 2231 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,246 psi | 90% | 3468 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,681 psi | 89% | 3419 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 56,724 psi | 89% | 3310 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 55,332 psi | 87% | 3320 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 82% | 57,029 psi | 89% | 3297 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,479 psi | 90% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,940 psi | 86% | 3317 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 54,650 psi | 86% | 3232 fps | 98.6% |
| Somchem S365 | <<locked>> | 82% | 54,650 psi | 86% | 3261 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,898 psi | 88% | 3291 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,825 psi | 87% | 3271 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,740 psi | 90% | 3310 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,955 psi | 86% | 3291 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,520 psi | 85% | 3366 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 92% | 55,405 psi | 87% | 3350 fps | 99% |
| Vihtavuori N568 | <<locked>> | 96% | 57,130 psi | 90% | 3425 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 96% | 54,259 psi | 85% | 3412 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,724 psi | 89% | 3409 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,767 psi | 87% | 3284 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,742 psi | 65% | 2995 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 80% | 43,323 psi | 68% | 3127 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 45,716 psi | 72% | 3143 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 41,046 psi | 64% | 3064 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 86% | 37,536 psi | 59% | 2966 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 49,922 psi | 78% | 3333 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 32,053 psi | 50% | 2851 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,489 psi | 82% | 3281 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,658 psi | 72% | 3133 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,742 psi | 65% | 3077 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,408 psi | 63% | 3022 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,925 psi | 55% | 2933 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,847 psi | 72% | 3199 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 51,184 psi | 80% | 3327 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,718 psi | 76% | 3173 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,798 psi | 61% | 3002 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 37,478 psi | 59% | 2986 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,742 psi | 65% | 3077 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 84% | 38,203 psi | 60% | 2989 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 43,642 psi | 68% | 3071 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,902 psi | 67% | 3054 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,371 psi | 77% | 3140 fps | 100% |
| Hodgdon Retumbo | 92.3 gr | 80% | 34,084 psi | 53% | 2956 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 1955 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,387 psi | 81% | 3199 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 51,837 psi | 81% | 3209 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,744 psi | 70% | 3068 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 39,740 psi | 62% | 3041 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,653 psi | 61% | 3028 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,447 psi | 84% | 3238 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,882 psi | 56% | 2854 fps | 98% |
| Norma 204 | <<locked>> | 80% | 52,301 psi | 82% | 3255 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 33,881 psi | 53% | 2920 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 44,309 psi | 69% | 3156 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 53,287 psi | 84% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,668 psi | 62% | 3051 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 52,359 psi | 82% | 3258 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,737 psi | 56% | 2913 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 45% | 2001 fps | 100% |
| ReloadSwiss RS 76 | 98.8 gr | 80% | 33,460 psi | 52% | 2927 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,582 psi | 65% | 3107 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 46,601 psi | 73% | 3117 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 45,208 psi | 71% | 3123 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 80% | 53,447 psi | 84% | 3238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,867 psi | 84% | 3182 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,860 psi | 70% | 3117 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 47,703 psi | 75% | 3100 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 50,981 psi | 80% | 3202 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,716 psi | 72% | 3100 fps | 99% |
| Vihtavuori N165 | <<locked>> | 80% | 39,871 psi | 62% | 2953 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 80% | 54,114 psi | 85% | 3251 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,947 psi | 70% | 3110 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,048 psi | 69% | 3146 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 82% | 39,247 psi | 62% | 3005 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 45,788 psi | 72% | 3199 fps | 95.9% |
| Vihtavuori N570 | 112.6 gr | 94% | 50,357 psi | 79% | 3333 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,261 psi | 60% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,105 psi | 66% | 3015 fps | 97.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 65 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Alaska Bullet Works Kodiak SP PSPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,481 fps; across all powders the maximum-charge window runs from 2,182 fps to 3,481 fps. Accurate 8700 gives the best case fill at 100 %, and 65 of the 65 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 1:14.0 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Alaska Bullet Works Kodiak SP PSPBC they combine a high case fill with complete burn and sit in the upper velocity band. 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.