Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Woodleigh PP SN 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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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% | 55,869 psi | 88% | 3264 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,696 psi | 90% | 3432 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,853 psi | 86% | 3366 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 57,000 psi | 89% | 3363 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,492 psi | 87% | 3373 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 54,259 psi | 85% | 3337 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3442 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3425 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 57,145 psi | 90% | 3356 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,000 psi | 89% | 3353 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,521 psi | 89% | 3346 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,970 psi | 88% | 3366 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,653 psi | 90% | 3330 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,157 psi | 85% | 3343 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,433 psi | 85% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,623 psi | 89% | 3428 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,260 psi | 88% | 3320 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 55,317 psi | 87% | 3353 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 54,201 psi | 85% | 3350 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 55,970 psi | 88% | 3366 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,695 psi | 87% | 3363 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,621 psi | 86% | 3297 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,406 psi | 90% | 3343 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,159 psi | 90% | 3264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,232 psi | 90% | 3501 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,521 psi | 59% | 2185 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,593 psi | 87% | 3274 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,289 psi | 88% | 3284 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,085 psi | 86% | 3278 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 88% | 53,766 psi | 84% | 3346 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,156 psi | 82% | 3327 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,667 psi | 90% | 3307 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,522 psi | 90% | 3291 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,855 psi | 89% | 3337 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3356 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,043 psi | 88% | 3386 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,682 psi | 90% | 3327 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,839 psi | 86% | 3369 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,869 psi | 89% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 53,548 psi | 84% | 3291 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,143 psi | 85% | 3412 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,563 psi | 84% | 3360 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,493 psi | 90% | 3327 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,347 psi | 88% | 3340 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,667 psi | 90% | 3307 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,956 psi | 88% | 3333 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,434 psi | 87% | 3248 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,579 psi | 87% | 3278 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,695 psi | 89% | 3304 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,695 psi | 89% | 3287 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,825 psi | 87% | 3307 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,463 psi | 87% | 3379 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,420 psi | 88% | 3369 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 54,172 psi | 85% | 3366 fps | 98% |
| Vihtavuori N570 | <<locked>> | 96% | 55,288 psi | 87% | 3432 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,722 psi | 84% | 3360 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,652 psi | 89% | 3301 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% | 42,525 psi | 67% | 3012 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 46,586 psi | 73% | 3215 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 44,063 psi | 69% | 3143 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,383 psi | 73% | 3156 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,771 psi | 65% | 3084 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 38,276 psi | 60% | 2986 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 51,010 psi | 80% | 3360 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 30,516 psi | 48% | 2802 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,891 psi | 73% | 3159 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,287 psi | 84% | 3294 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,441 psi | 73% | 3153 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,511 psi | 67% | 3091 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,133 psi | 64% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,534 psi | 56% | 2946 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,717 psi | 73% | 3215 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,457 psi | 76% | 3264 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,342 psi | 77% | 3186 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,450 psi | 62% | 3015 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 38,203 psi | 60% | 3002 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 42,511 psi | 67% | 3091 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,260 psi | 57% | 2933 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 44,396 psi | 70% | 3087 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,613 psi | 68% | 3071 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,125 psi | 79% | 3153 fps | 100% |
| Hodgdon Retumbo | 93.7 gr | 80% | 34,780 psi | 55% | 2979 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,011 psi | 82% | 3212 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,576 psi | 82% | 3219 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,339 psi | 71% | 3081 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,495 psi | 63% | 3061 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,494 psi | 62% | 3051 fps | 95.9% |
| Lovex S070 | <<locked>> | 80% | 54,114 psi | 85% | 3248 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,535 psi | 57% | 2874 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 53,098 psi | 83% | 3268 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,184 psi | 50% | 2867 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 45,136 psi | 71% | 3173 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 54,027 psi | 85% | 3268 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,466 psi | 63% | 3071 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 53,156 psi | 83% | 3271 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,463 psi | 57% | 2930 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 2008 fps | 100% |
| ReloadSwiss RS 76 | 100.2 gr | 80% | 34,069 psi | 53% | 2946 fps | 96.8% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,554 psi | 67% | 3127 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 47,224 psi | 74% | 3130 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,905 psi | 72% | 3136 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 80% | 54,114 psi | 85% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,556 psi | 71% | 3133 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 48,370 psi | 76% | 3114 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,764 psi | 81% | 3212 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,485 psi | 73% | 3117 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,582 psi | 64% | 2972 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 45,672 psi | 72% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,831 psi | 70% | 3163 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,958 psi | 63% | 3018 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 43,540 psi | 68% | 3146 fps | 95.2% |
| Vihtavuori N570 | 114.2 gr | 94% | 51,416 psi | 81% | 3353 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,276 psi | 62% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,830 psi | 67% | 3031 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 PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,501 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,501 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 PP SN 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.