Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Sierra Pro-Hunter bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,579 psi | 87% | 3261 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,551 psi | 90% | 3432 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,563 psi | 86% | 3360 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 86% | 56,826 psi | 89% | 3360 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,158 psi | 86% | 3363 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 53,969 psi | 85% | 3333 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3438 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3422 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,971 psi | 89% | 3353 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,811 psi | 89% | 3353 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,347 psi | 88% | 3343 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,637 psi | 87% | 3360 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,493 psi | 90% | 3327 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,012 psi | 85% | 3340 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,259 psi | 85% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,347 psi | 88% | 3425 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,999 psi | 88% | 3314 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 54,998 psi | 86% | 3346 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 57,667 psi | 90% | 3409 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 55,637 psi | 87% | 3360 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,550 psi | 87% | 3363 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,317 psi | 85% | 3287 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,087 psi | 89% | 3340 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,971 psi | 89% | 3264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,913 psi | 89% | 3494 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 2185 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,448 psi | 87% | 3274 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,956 psi | 88% | 3278 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,969 psi | 86% | 3274 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 57,493 psi | 90% | 3412 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,837 psi | 81% | 3320 fps | 99% |
| Lovex S070 | <<locked>> | 82% | 57,522 psi | 90% | 3307 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,377 psi | 90% | 3287 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,710 psi | 89% | 3337 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 3350 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,869 psi | 88% | 3383 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,522 psi | 90% | 3327 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,694 psi | 86% | 3366 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,724 psi | 89% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,566 psi | 90% | 3356 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,838 psi | 84% | 3409 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,740 psi | 90% | 3435 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 57,334 psi | 90% | 3323 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,159 psi | 88% | 3333 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,522 psi | 90% | 3307 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,811 psi | 87% | 3333 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,158 psi | 86% | 3245 fps | 98.7% |
| Somchem S365 | <<locked>> | 82% | 55,390 psi | 87% | 3271 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,521 psi | 89% | 3301 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,565 psi | 89% | 3284 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,666 psi | 87% | 3304 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,317 psi | 87% | 3376 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,304 psi | 88% | 3366 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 53,853 psi | 84% | 3366 fps | 98% |
| Vihtavuori N570 | <<locked>> | 96% | 55,187 psi | 86% | 3428 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,725 psi | 90% | 3425 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,550 psi | 89% | 3297 fps | 99.8% |
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% | 42,264 psi | 66% | 3009 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 46,441 psi | 73% | 3212 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 80% | 43,932 psi | 69% | 3140 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,224 psi | 72% | 3156 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,626 psi | 65% | 3081 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 38,043 psi | 60% | 2979 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 50,763 psi | 80% | 3356 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 32,503 psi | 51% | 2864 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,601 psi | 73% | 3153 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,098 psi | 83% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,166 psi | 72% | 3146 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,351 psi | 66% | 3091 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,973 psi | 64% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,389 psi | 55% | 2943 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,543 psi | 73% | 3212 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,182 psi | 76% | 3261 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,139 psi | 77% | 3179 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 39,291 psi | 62% | 3015 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 38,043 psi | 60% | 2999 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 42,351 psi | 66% | 3091 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,114 psi | 57% | 2930 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 44,251 psi | 69% | 3087 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,482 psi | 68% | 3068 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,937 psi | 78% | 3150 fps | 100% |
| Hodgdon Retumbo | 93.4 gr | 80% | 34,635 psi | 54% | 2976 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 44% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,851 psi | 81% | 3209 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,402 psi | 82% | 3219 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,208 psi | 71% | 3081 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,350 psi | 63% | 3058 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,334 psi | 62% | 3045 fps | 95.8% |
| Lovex S070 | <<locked>> | 80% | 53,954 psi | 85% | 3248 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,376 psi | 57% | 2867 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 52,939 psi | 83% | 3268 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,068 psi | 50% | 2864 fps | 95% |
| Norma MRP | <<locked>> | 80% | 44,991 psi | 71% | 3169 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 53,853 psi | 84% | 3264 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,321 psi | 63% | 3068 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 53,011 psi | 83% | 3268 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,318 psi | 57% | 2927 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 2008 fps | 100% |
| ReloadSwiss RS 76 | 99.9 gr | 80% | 33,968 psi | 53% | 2943 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,308 psi | 66% | 3123 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 47,079 psi | 74% | 3130 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,745 psi | 72% | 3136 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 53,954 psi | 85% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,397 psi | 71% | 3130 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 48,225 psi | 76% | 3114 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,590 psi | 81% | 3212 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,340 psi | 73% | 3110 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,321 psi | 63% | 2966 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 45,498 psi | 71% | 3120 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,686 psi | 70% | 3159 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,842 psi | 62% | 3018 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 43,265 psi | 68% | 3140 fps | 95% |
| Vihtavuori N570 | 113.8 gr | 94% | 51,126 psi | 80% | 3346 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,073 psi | 61% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,670 psi | 67% | 3028 fps | 97.8% |
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 58 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Sierra Pro-Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,494 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,494 fps. ADI AR 2218 gives the best case fill at 100 %, and 58 of the 58 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 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Sierra Pro-Hunter 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.