Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 140gr | Barnes MPG 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% | 53,998 psi | 85% | 3323 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,433 psi | 85% | 3360 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 55,550 psi | 87% | 3484 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 90% | 56,681 psi | 89% | 3488 fps | 98% |
| ADI AR 2209 | <<locked>> | 88% | 55,434 psi | 87% | 3422 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 57,435 psi | 90% | 3494 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3448 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,328 psi | 79% | 3399 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,448 psi | 87% | 3428 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,158 psi | 86% | 3409 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,740 psi | 90% | 3488 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,506 psi | 87% | 3399 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,390 psi | 87% | 3461 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,144 psi | 88% | 3488 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,056 psi | 86% | 3373 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 56,898 psi | 89% | 3471 fps | 99.5% |
| Bofors RP30 | <<locked>> | 98% | 55,259 psi | 87% | 3458 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 57,740 psi | 90% | 3488 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 56,043 psi | 88% | 3360 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 57,580 psi | 90% | 3481 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 82% | 56,014 psi | 88% | 3422 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 56,942 psi | 89% | 3422 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,927 psi | 88% | 3402 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,695 psi | 87% | 3340 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,302 psi | 85% | 3543 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 56,884 psi | 89% | 3455 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 58% | 2231 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,520 psi | 85% | 3343 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,392 psi | 90% | 3386 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 54,868 psi | 86% | 3350 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,493 psi | 90% | 3399 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 92% | 55,593 psi | 87% | 3468 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,788 psi | 72% | 3284 fps | 97.1% |
| Lovex S065 | <<locked>> | 82% | 54,795 psi | 86% | 3327 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,724 psi | 89% | 3379 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,521 psi | 87% | 3346 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,724 psi | 87% | 3406 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 46,267 psi | 73% | 3314 fps | 99% |
| Norma MRP | <<locked>> | 88% | 53,882 psi | 84% | 3438 fps | 99.8% |
| Norma URP | <<locked>> | 84% | 56,449 psi | 88% | 3402 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,608 psi | 89% | 3491 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 84% | 55,521 psi | 87% | 3402 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,405 psi | 87% | 3412 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,145 psi | 60% | 2287 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,592 psi | 86% | 3379 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,130 psi | 90% | 3474 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,317 psi | 87% | 3530 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,882 psi | 86% | 3474 fps | 98% |
| Rottweil R 904 | <<locked>> | 88% | 56,333 psi | 88% | 3389 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 88% | 54,650 psi | 86% | 3396 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 82% | 56,043 psi | 88% | 3360 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,795 psi | 86% | 3327 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,724 psi | 89% | 3379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,566 psi | 90% | 3330 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 54,244 psi | 85% | 3392 fps | 99.2% |
| Somchem S361 | <<locked>> | 86% | 54,360 psi | 85% | 3307 fps | 97.9% |
| Somchem S365 | <<locked>> | 86% | 57,537 psi | 90% | 3402 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,129 psi | 86% | 3366 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 82% | 54,418 psi | 85% | 3330 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,013 psi | 86% | 3343 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 57,334 psi | 90% | 3396 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,406 psi | 90% | 3428 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,377 psi | 90% | 3504 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 94% | 54,172 psi | 85% | 3412 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 98% | 55,317 psi | 87% | 3478 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 53,969 psi | 85% | 3274 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,159 psi | 88% | 3422 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,476 psi | 85% | 3481 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,158 psi | 86% | 3356 fps | 99.3% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 38,189 psi | 60% | 2995 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 50,691 psi | 79% | 3294 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,655 psi | 65% | 3186 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 84% | 45,614 psi | 71% | 3261 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 42,192 psi | 66% | 3146 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 43,352 psi | 68% | 3202 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 42,221 psi | 66% | 3159 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 88% | 33,431 psi | 52% | 2969 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,370 psi | 76% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,134 psi | 66% | 3136 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,116 psi | 60% | 3068 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,767 psi | 58% | 3025 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,865 psi | 50% | 2920 fps | 96.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,191 psi | 65% | 3192 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,561 psi | 81% | 3304 fps | 95.2% |
| Bofors RP15 | <<locked>> | 82% | 38,000 psi | 60% | 3061 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 41,800 psi | 66% | 3176 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 38,116 psi | 60% | 3068 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 52,533 psi | 82% | 3297 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 40,248 psi | 63% | 3117 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 52,301 psi | 82% | 3350 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 82% | 43,207 psi | 68% | 3140 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 45,397 psi | 71% | 3189 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,556 psi | 71% | 3159 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 38,290 psi | 60% | 3163 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 52,707 psi | 83% | 3379 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 44% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,979 psi | 75% | 3215 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,896 psi | 84% | 3327 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 48,051 psi | 75% | 3228 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,512 psi | 70% | 3140 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 41,843 psi | 66% | 3176 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,726 psi | 62% | 3140 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 51,430 psi | 81% | 3264 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 49,922 psi | 78% | 3255 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 32,808 psi | 51% | 2851 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 48,530 psi | 76% | 3264 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 34,867 psi | 55% | 3031 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 40,219 psi | 63% | 3146 fps | 97.5% |
| Norma URP | <<locked>> | 80% | 49,458 psi | 78% | 3278 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,872 psi | 66% | 3186 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 48,501 psi | 76% | 3274 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 34,809 psi | 55% | 2963 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 45% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,923 psi | 80% | 3314 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,313 psi | 77% | 3337 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 35,085 psi | 55% | 3051 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 46,760 psi | 73% | 3310 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 43,323 psi | 68% | 3123 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 41,640 psi | 65% | 3123 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 52,533 psi | 82% | 3297 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,430 psi | 81% | 3264 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 49,922 psi | 78% | 3255 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,343 psi | 79% | 3202 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,307 psi | 65% | 3120 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 44,353 psi | 70% | 3104 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 46,804 psi | 73% | 3225 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,163 psi | 66% | 3104 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 80% | 50,778 psi | 80% | 3268 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,593 psi | 57% | 2949 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 50,314 psi | 79% | 3274 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,133 psi | 64% | 3120 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 43,163 psi | 68% | 3209 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 43,918 psi | 69% | 3199 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 47,819 psi | 75% | 3327 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,270 psi | 79% | 3212 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,460 psi | 82% | 3356 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,678 psi | 53% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,725 psi | 61% | 3012 fps | 95.6% |
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 MPG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,543 fps; across all powders the maximum-charge window runs from 2,231 fps to 3,543 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 1:10.5 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.