Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Lapua Mega bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 80 and Vihtavuori N568.
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% | 56,971 psi | 89% | 3284 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,363 psi | 90% | 3317 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,941 psi | 88% | 3389 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 54,476 psi | 85% | 3317 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 90% | 56,623 psi | 89% | 3392 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 55,187 psi | 86% | 3356 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3376 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,882 psi | 86% | 3317 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,592 psi | 86% | 3317 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,288 psi | 85% | 3307 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,985 psi | 89% | 3386 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,853 psi | 86% | 3291 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,969 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,637 psi | 87% | 3383 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,363 psi | 90% | 3445 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,609 psi | 90% | 3343 fps | 97.4% |
| Bofors RP15 | <<locked>> | 92% | 56,173 psi | 88% | 3369 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 54,839 psi | 86% | 3366 fps | 99.4% |
| Bofors RP5 | <<locked>> | 90% | 56,985 psi | 89% | 3386 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 56,782 psi | 89% | 3383 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 55,956 psi | 88% | 3317 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,940 psi | 86% | 3301 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,897 psi | 86% | 3232 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,969 psi | 85% | 3448 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 2172 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,000 psi | 89% | 3297 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,595 psi | 90% | 3301 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,536 psi | 89% | 3301 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 54,926 psi | 86% | 3369 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,081 psi | 77% | 3271 fps | 98.5% |
| Lovex S065 | <<locked>> | 82% | 57,174 psi | 90% | 3274 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,651 psi | 87% | 3274 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,926 psi | 86% | 3251 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,592 psi | 86% | 3294 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 3301 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 57,246 psi | 90% | 3406 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,463 psi | 87% | 3294 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,956 psi | 88% | 3389 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 54,563 psi | 86% | 3297 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,650 psi | 86% | 3310 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 2221 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,653 psi | 90% | 3337 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,246 psi | 88% | 3366 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,882 psi | 86% | 3435 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,331 psi | 85% | 3383 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,288 psi | 87% | 3284 fps | 99% |
| Rottweil R 905 | <<locked>> | 88% | 57,493 psi | 90% | 3356 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,174 psi | 90% | 3274 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,651 psi | 87% | 3274 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,246 psi | 88% | 3222 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,087 psi | 89% | 3356 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 56,884 psi | 89% | 3271 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 56,753 psi | 89% | 3297 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,317 psi | 85% | 3264 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 57,043 psi | 89% | 3284 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,186 psi | 85% | 3241 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,362 psi | 88% | 3287 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,913 psi | 89% | 3323 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,695 psi | 89% | 3402 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 94% | 57,551 psi | 90% | 3389 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 54,969 psi | 86% | 3389 fps | 98% |
| Vihtavuori N570 | <<locked>> | 98% | 56,014 psi | 88% | 3448 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,768 psi | 89% | 3225 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,302 psi | 85% | 3383 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,085 psi | 85% | 3255 fps | 99.5% |
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% | 40,451 psi | 63% | 2969 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 53,432 psi | 84% | 3251 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 45,092 psi | 71% | 3166 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 44,498 psi | 70% | 3117 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 39,798 psi | 62% | 3035 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 88% | 38,972 psi | 61% | 3005 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 31,009 psi | 49% | 2822 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,788 psi | 70% | 3117 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,039 psi | 80% | 3255 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,382 psi | 70% | 3107 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,422 psi | 63% | 3048 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,131 psi | 61% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,837 psi | 53% | 2904 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,222 psi | 69% | 3173 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,052 psi | 77% | 3284 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,546 psi | 79% | 3205 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 37,623 psi | 59% | 2972 fps | 95.8% |
| Bofors RP30 | <<locked>> | 86% | 38,827 psi | 61% | 3022 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,422 psi | 63% | 3048 fps | 97% |
| Hodgdon H1000 | <<locked>> | 84% | 37,014 psi | 58% | 2956 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 42,409 psi | 66% | 3045 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,669 psi | 65% | 3025 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,008 psi | 75% | 3117 fps | 100% |
| Hodgdon Retumbo | 92.2 gr | 82% | 35,375 psi | 55% | 3002 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 44% | 1946 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,227 psi | 79% | 3176 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 50,546 psi | 79% | 3186 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,729 psi | 69% | 3045 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 41,336 psi | 65% | 3087 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,769 psi | 62% | 3064 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,722 psi | 84% | 3219 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,243 psi | 82% | 3212 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,838 psi | 55% | 2831 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 50,966 psi | 80% | 3228 fps | 99% |
| Norma 217 | <<locked>> | 88% | 32,474 psi | 51% | 2884 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,815 psi | 67% | 3127 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 51,953 psi | 81% | 3235 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,392 psi | 60% | 3018 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,010 psi | 80% | 3235 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,461 psi | 54% | 2881 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 45% | 1991 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,679 psi | 84% | 3274 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,243 psi | 82% | 3301 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,314 psi | 51% | 2890 fps | 95.6% |
| ReloadSwiss RS 80 | 109.2 gr | 90% | 43,091 psi | 68% | 3150 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,469 psi | 71% | 3091 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,976 psi | 69% | 3094 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,722 psi | 84% | 3219 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,243 psi | 82% | 3212 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,562 psi | 82% | 3163 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,642 psi | 68% | 3091 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 46,499 psi | 73% | 3074 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 49,545 psi | 78% | 3179 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,425 psi | 70% | 3071 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 80% | 53,287 psi | 84% | 3222 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,667 psi | 61% | 2927 fps | 97% |
| Vihtavuori N550 | <<locked>> | 80% | 52,765 psi | 83% | 3225 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,613 psi | 68% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,627 psi | 67% | 3114 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 40,654 psi | 64% | 3041 fps | 95.4% |
| Vihtavuori N568 | 105.6 gr | 90% | 44,179 psi | 69% | 3166 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 96% | 52,069 psi | 82% | 3373 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,939 psi | 83% | 3166 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,651 psi | 57% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,915 psi | 64% | 2989 fps | 97.1% |
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 | Lapua Mega. Hodgdon Retumbo delivers the highest muzzle velocity at 3,448 fps; across all powders the maximum-charge window runs from 2,172 fps to 3,448 fps. ADI AR 2225 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 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-33, Hodgdon TrailBoss 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. Hodgdon Retumbo, ReloadSwiss RS 80, Vihtavuori N568 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Lapua Mega they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.