Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 138gr | Hammer HHT bullet and 68 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and IMR 7828 SSC.
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>> | 92% | 57,014 psi | 89% | 3396 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,508 psi | 90% | 3435 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,217 psi | 88% | 3501 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 88% | 55,042 psi | 86% | 3438 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 57,087 psi | 89% | 3510 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3468 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 3409 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,955 psi | 86% | 3442 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,723 psi | 86% | 3425 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,261 psi | 90% | 3501 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,882 psi | 86% | 3409 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,056 psi | 86% | 3478 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,724 psi | 87% | 3497 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,752 psi | 86% | 3389 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 56,391 psi | 88% | 3481 fps | 99.4% |
| Bofors RP30 | <<locked>> | 98% | 54,708 psi | 86% | 3471 fps | 98.9% |
| Bofors RP5 | <<locked>> | 92% | 57,261 psi | 90% | 3501 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 55,434 psi | 87% | 3376 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 57,174 psi | 90% | 3497 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 82% | 55,477 psi | 87% | 3435 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 56,579 psi | 89% | 3435 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,564 psi | 87% | 3419 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,172 psi | 86% | 3353 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 53,896 psi | 84% | 3556 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 82% | 56,507 psi | 89% | 3468 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,101 psi | 58% | 2254 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,099 psi | 85% | 3356 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,942 psi | 89% | 3402 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 54,215 psi | 85% | 3366 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,217 psi | 90% | 3419 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 92% | 55,216 psi | 87% | 3484 fps | 98.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,150 psi | 71% | 3287 fps | 96.8% |
| Lovex S065 | <<locked>> | 84% | 57,696 psi | 90% | 3402 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,130 psi | 88% | 3396 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 54,621 psi | 86% | 3356 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,201 psi | 87% | 3419 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 45,745 psi | 72% | 3323 fps | 98.9% |
| Norma MRP | <<locked>> | 90% | 57,493 psi | 90% | 3524 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,927 psi | 88% | 3419 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,318 psi | 88% | 3507 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 84% | 54,955 psi | 86% | 3419 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,853 psi | 86% | 3425 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 60% | 2306 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,012 psi | 85% | 3392 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,666 psi | 89% | 3491 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,042 psi | 86% | 3547 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,389 psi | 85% | 3484 fps | 97.8% |
| Rottweil R 904 | <<locked>> | 88% | 55,999 psi | 88% | 3409 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 88% | 54,128 psi | 85% | 3409 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 82% | 55,434 psi | 87% | 3376 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,696 psi | 90% | 3402 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,130 psi | 88% | 3396 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,927 psi | 89% | 3346 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,624 psi | 90% | 3474 fps | 99.6% |
| Somchem S361 | <<locked>> | 86% | 53,925 psi | 85% | 3323 fps | 97.8% |
| Somchem S365 | <<locked>> | 86% | 57,029 psi | 89% | 3419 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,665 psi | 86% | 3379 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 84% | 57,566 psi | 90% | 3409 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,520 psi | 85% | 3356 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 84% | 56,869 psi | 89% | 3409 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,695 psi | 89% | 3438 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,072 psi | 89% | 3520 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 96% | 57,435 psi | 90% | 3494 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 98% | 54,955 psi | 86% | 3491 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,580 psi | 90% | 3350 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,622 psi | 87% | 3435 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 53,882 psi | 84% | 3491 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,723 psi | 86% | 3373 fps | 99.3% |
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% | 37,304 psi | 58% | 2992 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 49,980 psi | 78% | 3304 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,976 psi | 70% | 3268 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 41,669 psi | 65% | 3156 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 42,931 psi | 67% | 3212 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 41,756 psi | 65% | 3169 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 35,114 psi | 55% | 3041 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,921 psi | 75% | 3314 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,698 psi | 65% | 3146 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,521 psi | 59% | 3071 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,100 psi | 57% | 3028 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,154 psi | 49% | 2913 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,509 psi | 63% | 3192 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,314 psi | 80% | 3320 fps | 95.1% |
| Bofors RP15 | <<locked>> | 84% | 40,045 psi | 63% | 3136 fps | 95.9% |
| Bofors RP30 | <<locked>> | 90% | 41,075 psi | 64% | 3179 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,521 psi | 59% | 3071 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 51,982 psi | 81% | 3314 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,653 psi | 62% | 3120 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 51,648 psi | 81% | 3363 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 84% | 45,818 psi | 72% | 3222 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,976 psi | 70% | 3202 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,991 psi | 71% | 3173 fps | 100% |
| Hodgdon Retumbo | 98.3 gr | 86% | 37,565 psi | 59% | 3159 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 52,359 psi | 82% | 3396 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 44% | 2028 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,456 psi | 74% | 3228 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,461 psi | 84% | 3343 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 47,369 psi | 74% | 3238 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,961 psi | 69% | 3150 fps | 95.5% |
| IMR 7828 SSC | 95.9 gr | 84% | 41,263 psi | 65% | 3182 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 42,032 psi | 66% | 3212 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 50,836 psi | 80% | 3278 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 49,240 psi | 77% | 3268 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 31,778 psi | 50% | 2838 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 47,906 psi | 75% | 3274 fps | 98% |
| Norma 217 | <<locked>> | 94% | 36,651 psi | 57% | 3097 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 39,581 psi | 62% | 3150 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 48,805 psi | 76% | 3287 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,176 psi | 65% | 3189 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 47,834 psi | 75% | 3281 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 36,912 psi | 58% | 3038 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 2070 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,256 psi | 79% | 3327 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,791 psi | 76% | 3346 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 34,447 psi | 54% | 3048 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 46,180 psi | 72% | 3314 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 42,801 psi | 67% | 3133 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 40,973 psi | 64% | 3130 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 51,982 psi | 81% | 3314 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,836 psi | 80% | 3278 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 49,240 psi | 77% | 3268 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,850 psi | 78% | 3219 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,640 psi | 64% | 3123 fps | 96.3% |
| Somchem S361 | <<locked>> | 80% | 43,729 psi | 69% | 3114 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 46,122 psi | 72% | 3232 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,524 psi | 65% | 3110 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 80% | 50,328 psi | 79% | 3284 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,998 psi | 56% | 2956 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 49,603 psi | 78% | 3281 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,277 psi | 63% | 3117 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 45,948 psi | 72% | 3294 fps | 96% |
| Vihtavuori N565 | <<locked>> | 88% | 43,236 psi | 68% | 3202 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 94% | 47,239 psi | 74% | 3330 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,893 psi | 78% | 3228 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,793 psi | 81% | 3366 fps | 99.6% |
| Winchester StaBALL HD | 93.9 gr | 80% | 32,851 psi | 51% | 3041 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,000 psi | 60% | 3015 fps | 95.3% |
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 73 powders for .30-378 Weath. Mag. loaded with the .308 | 138gr | Hammer HHT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,556 fps; across all powders the maximum-charge window runs from 2,254 fps to 3,556 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 138.0 gr projectile in 0.308" calls for a 1:11.5 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. Hodgdon Retumbo, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .30-378 Weath. Mag. with the .308 | 138gr | Hammer HHT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, IMR 7977 Enduron, Vihtavuori N170 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.