Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Woodleigh HS 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,651 psi | 87% | 3261 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,493 psi | 90% | 3428 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,621 psi | 86% | 3363 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 86% | 56,739 psi | 89% | 3356 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,230 psi | 87% | 3366 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 54,056 psi | 85% | 3337 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,708 psi | 86% | 3438 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,826 psi | 89% | 3422 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 57,072 psi | 89% | 3353 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,913 psi | 89% | 3353 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,449 psi | 88% | 3346 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,738 psi | 87% | 3363 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,595 psi | 90% | 3330 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,114 psi | 85% | 3340 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,317 psi | 85% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,434 psi | 88% | 3422 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,072 psi | 88% | 3317 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 55,100 psi | 86% | 3350 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 53,969 psi | 85% | 3346 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 55,738 psi | 87% | 3363 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,463 psi | 87% | 3360 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,404 psi | 85% | 3291 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,159 psi | 90% | 3340 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,072 psi | 89% | 3264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,014 psi | 89% | 3497 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 59% | 2185 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,390 psi | 87% | 3271 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 56,057 psi | 88% | 3278 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,882 psi | 86% | 3274 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 57,551 psi | 90% | 3415 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,938 psi | 81% | 3323 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,609 psi | 90% | 3307 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,305 psi | 90% | 3287 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,637 psi | 89% | 3333 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 3353 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,811 psi | 87% | 3379 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,580 psi | 90% | 3327 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,795 psi | 86% | 3369 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,623 psi | 89% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,667 psi | 90% | 3360 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,911 psi | 84% | 3409 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,359 psi | 84% | 3356 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,435 psi | 90% | 3327 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,101 psi | 88% | 3333 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,609 psi | 90% | 3307 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,709 psi | 87% | 3330 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,245 psi | 87% | 3245 fps | 98.7% |
| Somchem S365 | <<locked>> | 82% | 55,317 psi | 87% | 3271 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,594 psi | 89% | 3301 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,507 psi | 89% | 3284 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,593 psi | 87% | 3301 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,274 psi | 87% | 3376 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,405 psi | 88% | 3369 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 53,954 psi | 85% | 3363 fps | 98% |
| Vihtavuori N570 | <<locked>> | 96% | 55,056 psi | 86% | 3428 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,653 psi | 90% | 3422 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,434 psi | 88% | 3294 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% | 42,322 psi | 66% | 3009 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 46,514 psi | 73% | 3215 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 43,990 psi | 69% | 3140 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,311 psi | 73% | 3156 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,582 psi | 65% | 3081 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 38,101 psi | 60% | 2982 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 50,676 psi | 79% | 3353 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 32,576 psi | 51% | 2867 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,702 psi | 73% | 3156 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,185 psi | 83% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,267 psi | 73% | 3150 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,322 psi | 66% | 3087 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,046 psi | 64% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,462 psi | 56% | 2946 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,659 psi | 73% | 3215 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,269 psi | 76% | 3264 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,211 psi | 77% | 3182 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 39,378 psi | 62% | 3015 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 38,130 psi | 60% | 2999 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 42,322 psi | 66% | 3087 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,187 psi | 57% | 2933 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 44,193 psi | 69% | 3084 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,424 psi | 68% | 3068 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,009 psi | 78% | 3150 fps | 100% |
| Hodgdon Retumbo | 93.4 gr | 80% | 34,606 psi | 54% | 2972 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,953 psi | 81% | 3212 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,475 psi | 82% | 3219 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,295 psi | 71% | 3081 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,292 psi | 63% | 3054 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,291 psi | 62% | 3045 fps | 95.8% |
| Lovex S070 | <<locked>> | 80% | 54,041 psi | 85% | 3248 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,434 psi | 57% | 2871 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 52,895 psi | 83% | 3268 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,126 psi | 50% | 2864 fps | 95% |
| Norma MRP | <<locked>> | 80% | 45,063 psi | 71% | 3169 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 53,940 psi | 85% | 3264 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,277 psi | 63% | 3068 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 52,924 psi | 83% | 3268 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,376 psi | 57% | 2927 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 2008 fps | 100% |
| ReloadSwiss RS 76 | 100 gr | 80% | 34,026 psi | 53% | 2943 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,351 psi | 66% | 3123 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 47,152 psi | 74% | 3130 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,803 psi | 72% | 3136 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 54,041 psi | 85% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,455 psi | 71% | 3130 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 48,312 psi | 76% | 3114 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,692 psi | 81% | 3212 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,311 psi | 73% | 3110 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 80% | 40,393 psi | 63% | 2969 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 45,600 psi | 71% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,759 psi | 70% | 3163 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,755 psi | 62% | 3015 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 88% | 43,352 psi | 68% | 3140 fps | 95.1% |
| Vihtavuori N570 | 113.9 gr | 94% | 51,227 psi | 80% | 3353 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,001 psi | 61% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,627 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 | Woodleigh HS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,497 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,497 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 | Woodleigh HS 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.