Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Barnes RRLP bullet and 66 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 76 and ReloadSwiss RS 80.
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% | 56,956 psi | 89% | 3281 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,145 psi | 90% | 3310 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,810 psi | 86% | 3386 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 88% | 55,753 psi | 87% | 3386 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 54,491 psi | 85% | 3317 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 90% | 56,623 psi | 89% | 3392 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 55,042 psi | 86% | 3353 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 3373 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,694 psi | 86% | 3310 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,563 psi | 86% | 3317 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,711 psi | 90% | 3366 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,000 psi | 89% | 3386 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,853 psi | 86% | 3291 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,940 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,434 psi | 87% | 3379 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3442 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,493 psi | 90% | 3337 fps | 97.4% |
| Bofors RP15 | <<locked>> | 92% | 56,173 psi | 88% | 3369 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 54,795 psi | 86% | 3366 fps | 99.4% |
| Bofors RP5 | <<locked>> | 90% | 57,000 psi | 89% | 3386 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 56,637 psi | 89% | 3383 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 55,956 psi | 88% | 3317 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,781 psi | 86% | 3297 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,708 psi | 86% | 3228 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,751 psi | 84% | 3445 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 2169 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,000 psi | 89% | 3297 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,551 psi | 90% | 3304 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,376 psi | 88% | 3297 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 54,766 psi | 86% | 3366 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,950 psi | 77% | 3268 fps | 98.4% |
| Lovex S065 | <<locked>> | 82% | 57,174 psi | 90% | 3274 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,463 psi | 87% | 3271 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,752 psi | 86% | 3248 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,433 psi | 85% | 3294 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 49,690 psi | 78% | 3297 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 57,029 psi | 89% | 3406 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,288 psi | 87% | 3291 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,927 psi | 88% | 3392 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 54,375 psi | 85% | 3294 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,491 psi | 85% | 3310 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 60% | 2218 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,450 psi | 90% | 3333 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,014 psi | 88% | 3363 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,679 psi | 86% | 3428 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,346 psi | 85% | 3383 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,259 psi | 87% | 3284 fps | 99% |
| Rottweil R 905 | <<locked>> | 88% | 57,464 psi | 90% | 3360 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,174 psi | 90% | 3274 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,463 psi | 87% | 3271 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,072 psi | 88% | 3222 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,087 psi | 89% | 3353 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 56,869 psi | 89% | 3268 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 56,710 psi | 89% | 3294 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,302 psi | 85% | 3264 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 56,840 psi | 89% | 3281 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,172 psi | 85% | 3245 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,173 psi | 88% | 3284 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,695 psi | 89% | 3323 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,536 psi | 89% | 3402 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 94% | 57,334 psi | 90% | 3386 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 54,781 psi | 86% | 3386 fps | 98% |
| Vihtavuori N570 | <<locked>> | 98% | 55,985 psi | 88% | 3451 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,579 psi | 89% | 3222 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,302 psi | 85% | 3379 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,099 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% | 40,422 psi | 63% | 2966 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 53,374 psi | 84% | 3251 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,222 psi | 69% | 3163 fps | 96.9% |
| Accurate MAGPRO | <<locked>> | 82% | 44,933 psi | 70% | 3166 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 44,338 psi | 69% | 3114 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 39,755 psi | 62% | 3035 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 88% | 38,943 psi | 61% | 3005 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 30,980 psi | 49% | 2818 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,744 psi | 70% | 3114 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,995 psi | 80% | 3255 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,367 psi | 70% | 3107 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,408 psi | 63% | 3045 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,088 psi | 61% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,721 psi | 53% | 2900 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,048 psi | 69% | 3169 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,023 psi | 77% | 3287 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,546 psi | 79% | 3205 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 37,492 psi | 59% | 2969 fps | 95.8% |
| Bofors RP30 | <<locked>> | 86% | 38,667 psi | 61% | 3018 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,408 psi | 63% | 3045 fps | 97% |
| Hodgdon H1000 | <<locked>> | 84% | 36,985 psi | 58% | 2956 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 42,409 psi | 66% | 3041 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,626 psi | 65% | 3025 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,950 psi | 75% | 3117 fps | 100% |
| Hodgdon Retumbo | 92 gr | 82% | 35,259 psi | 55% | 2995 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 44% | 1946 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,038 psi | 78% | 3173 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 50,386 psi | 79% | 3182 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,584 psi | 68% | 3038 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 41,205 psi | 65% | 3081 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,755 psi | 62% | 3064 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,679 psi | 84% | 3219 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,040 psi | 82% | 3209 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,780 psi | 55% | 2828 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 50,792 psi | 80% | 3225 fps | 99% |
| Norma 217 | <<locked>> | 88% | 32,372 psi | 51% | 2877 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,772 psi | 67% | 3127 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 51,779 psi | 81% | 3228 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,261 psi | 60% | 3015 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 50,821 psi | 80% | 3228 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,432 psi | 54% | 2881 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 45% | 1995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,664 psi | 84% | 3271 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,040 psi | 82% | 3297 fps | 100% |
| ReloadSwiss RS 76 | 96.1 gr | 80% | 32,213 psi | 50% | 2890 fps | 95.5% |
| ReloadSwiss RS 80 | 109 gr | 90% | 42,960 psi | 67% | 3146 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,426 psi | 71% | 3091 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,830 psi | 69% | 3094 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,679 psi | 84% | 3219 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,040 psi | 82% | 3209 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,576 psi | 82% | 3159 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,497 psi | 68% | 3087 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 46,369 psi | 73% | 3071 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 49,371 psi | 77% | 3176 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% | 38,638 psi | 61% | 2923 fps | 97% |
| Vihtavuori N550 | <<locked>> | 80% | 52,721 psi | 83% | 3225 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,584 psi | 68% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,598 psi | 67% | 3114 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 40,509 psi | 63% | 3041 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 44,019 psi | 69% | 3159 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 51,880 psi | 81% | 3369 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,765 psi | 83% | 3163 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,477 psi | 57% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,872 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 66 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Barnes RRLP. Vihtavuori N570 delivers the highest muzzle velocity at 3,451 fps; across all powders the maximum-charge window runs from 2,169 fps to 3,451 fps. ADI AR 2225 gives the best case fill at 100 %, and 66 of the 66 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 1:11.0 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 76, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Barnes RRLP 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.