Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 140gr | Barnes RRLP bullet and 69 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>> | 90% | 54,172 psi | 85% | 3327 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,665 psi | 86% | 3366 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 55,869 psi | 88% | 3494 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 90% | 57,014 psi | 89% | 3494 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 88% | 55,738 psi | 87% | 3428 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 90% | 53,780 psi | 84% | 3425 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,057 psi | 88% | 3451 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 3406 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,680 psi | 87% | 3432 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,274 psi | 87% | 3412 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,143 psi | 85% | 3422 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,666 psi | 87% | 3396 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,695 psi | 87% | 3468 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,536 psi | 89% | 3491 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,245 psi | 87% | 3376 fps | 96.2% |
| Bofors RP15 | <<locked>> | 94% | 57,188 psi | 90% | 3474 fps | 99.5% |
| Bofors RP30 | <<locked>> | 98% | 55,550 psi | 87% | 3465 fps | 99.1% |
| Bofors RP5 | <<locked>> | 90% | 54,143 psi | 85% | 3422 fps | 99.3% |
| Bofors RP7 | <<locked>> | 82% | 56,188 psi | 88% | 3366 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 57,696 psi | 90% | 3484 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 82% | 56,159 psi | 88% | 3422 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,232 psi | 90% | 3425 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,028 psi | 88% | 3406 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,854 psi | 88% | 3340 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,433 psi | 85% | 3543 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 57,188 psi | 90% | 3458 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,289 psi | 58% | 2234 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,679 psi | 86% | 3343 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,537 psi | 90% | 3389 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 55,027 psi | 86% | 3353 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,215 psi | 85% | 3343 fps | 98% |
| IMR 7828 SSC | <<locked>> | 92% | 55,738 psi | 87% | 3471 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,035 psi | 72% | 3291 fps | 97.2% |
| Lovex S065 | <<locked>> | 82% | 54,940 psi | 86% | 3327 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,869 psi | 89% | 3383 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,680 psi | 87% | 3350 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,898 psi | 88% | 3406 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 46,543 psi | 73% | 3320 fps | 99.1% |
| Norma MRP | <<locked>> | 88% | 54,215 psi | 85% | 3448 fps | 99.8% |
| Norma URP | <<locked>> | 84% | 56,608 psi | 89% | 3406 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,782 psi | 89% | 3494 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 55,709 psi | 87% | 3406 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,550 psi | 87% | 3412 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,130 psi | 60% | 2287 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,897 psi | 86% | 3386 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,261 psi | 90% | 3478 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,637 psi | 87% | 3537 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,172 psi | 86% | 3481 fps | 98% |
| Rottweil R 904 | <<locked>> | 88% | 56,507 psi | 89% | 3392 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 54,781 psi | 86% | 3399 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 82% | 56,188 psi | 88% | 3366 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,940 psi | 86% | 3327 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,869 psi | 89% | 3383 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,682 psi | 90% | 3333 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 54,375 psi | 85% | 3392 fps | 99.3% |
| Somchem S361 | <<locked>> | 86% | 54,491 psi | 85% | 3310 fps | 97.9% |
| Somchem S365 | <<locked>> | 86% | 57,696 psi | 90% | 3406 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,434 psi | 87% | 3369 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 82% | 54,578 psi | 86% | 3337 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,288 psi | 87% | 3346 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 57,653 psi | 90% | 3399 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,070 psi | 85% | 3373 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,696 psi | 90% | 3510 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 94% | 54,491 psi | 85% | 3419 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 98% | 55,622 psi | 87% | 3484 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,288 psi | 85% | 3278 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,318 psi | 88% | 3425 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,694 psi | 86% | 3484 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,274 psi | 87% | 3360 fps | 99.3% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 38,435 psi | 60% | 3002 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 51,039 psi | 80% | 3301 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,814 psi | 66% | 3186 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 84% | 45,788 psi | 72% | 3264 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 42,337 psi | 66% | 3150 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 43,497 psi | 68% | 3205 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 42,482 psi | 67% | 3166 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 88% | 33,547 psi | 53% | 2972 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,559 psi | 76% | 3304 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,409 psi | 66% | 3143 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,261 psi | 60% | 3071 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,927 psi | 58% | 3028 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,995 psi | 50% | 2923 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,481 psi | 65% | 3199 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,808 psi | 81% | 3310 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 38,145 psi | 60% | 3064 fps | 95.2% |
| Bofors RP30 | <<locked>> | 90% | 41,930 psi | 66% | 3179 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 38,261 psi | 60% | 3071 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 52,692 psi | 83% | 3301 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 40,495 psi | 63% | 3123 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 52,460 psi | 82% | 3356 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 82% | 43,337 psi | 68% | 3143 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 45,527 psi | 71% | 3192 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,730 psi | 72% | 3163 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 35,781 psi | 56% | 3084 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 53,026 psi | 83% | 3386 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 44% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,138 psi | 75% | 3222 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,056 psi | 85% | 3330 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 48,225 psi | 76% | 3232 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,643 psi | 70% | 3143 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 41,974 psi | 66% | 3179 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 40,001 psi | 63% | 3146 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 51,605 psi | 81% | 3271 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,082 psi | 78% | 3258 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 32,967 psi | 52% | 2854 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 48,675 psi | 76% | 3268 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 34,983 psi | 55% | 3035 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 40,408 psi | 63% | 3153 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 49,632 psi | 78% | 3281 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 42,018 psi | 66% | 3192 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 48,646 psi | 76% | 3274 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 35,041 psi | 55% | 2972 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 45% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,068 psi | 80% | 3320 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,516 psi | 78% | 3343 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 35,331 psi | 55% | 3061 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 47,050 psi | 74% | 3317 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 43,482 psi | 68% | 3127 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 41,800 psi | 66% | 3127 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 52,692 psi | 83% | 3301 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,605 psi | 81% | 3271 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,082 psi | 78% | 3258 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,473 psi | 79% | 3205 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,481 psi | 65% | 3123 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 44,483 psi | 70% | 3110 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 47,036 psi | 74% | 3228 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,351 psi | 66% | 3107 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 80% | 51,082 psi | 80% | 3274 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,854 psi | 58% | 2956 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 50,459 psi | 79% | 3274 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,307 psi | 65% | 3123 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 43,439 psi | 68% | 3215 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 44,193 psi | 69% | 3205 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 94% | 47,979 psi | 75% | 3333 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,589 psi | 79% | 3219 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,605 psi | 82% | 3356 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,866 psi | 53% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,885 psi | 61% | 3015 fps | 95.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 75 powders for .30-378 Weath. Mag. loaded with the .308 | 140gr | Barnes RRLP. Vihtavuori N570 delivers the highest muzzle velocity at 3,550 fps; across all powders the maximum-charge window runs from 2,234 fps to 3,550 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.