Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Swift Scirocco bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, IMR 7828 SSC 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>> | 90% | 57,595 psi | 90% | 3294 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,507 psi | 89% | 3399 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 86% | 55,100 psi | 86% | 3327 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 90% | 57,217 psi | 90% | 3402 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 55,753 psi | 87% | 3366 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3386 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,143 psi | 86% | 3327 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,708 psi | 86% | 3314 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,595 psi | 90% | 3399 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,506 psi | 87% | 3301 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,753 psi | 87% | 3373 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,304 psi | 88% | 3392 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,795 psi | 84% | 3379 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,346 psi | 85% | 3284 fps | 96.8% |
| Bofors RP15 | <<locked>> | 92% | 56,768 psi | 89% | 3379 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 55,579 psi | 87% | 3379 fps | 99.5% |
| Bofors RP5 | <<locked>> | 90% | 57,595 psi | 90% | 3399 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 57,363 psi | 90% | 3392 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 56,536 psi | 89% | 3327 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,361 psi | 87% | 3307 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,390 psi | 87% | 3241 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,578 psi | 86% | 3458 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 59% | 2175 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,421 psi | 90% | 3307 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,447 psi | 85% | 3251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,913 psi | 89% | 3307 fps | 99% |
| IMR 7828 SSC | <<locked>> | 90% | 55,564 psi | 87% | 3383 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,676 psi | 78% | 3284 fps | 98.6% |
| Lovex S065 | <<locked>> | 82% | 57,638 psi | 90% | 3284 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,115 psi | 88% | 3281 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,521 psi | 87% | 3261 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,056 psi | 86% | 3304 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 50,604 psi | 79% | 3314 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 53,795 psi | 84% | 3350 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,970 psi | 88% | 3301 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,608 psi | 89% | 3402 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 54,984 psi | 86% | 3304 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,259 psi | 87% | 3323 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,334 psi | 60% | 2224 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,739 psi | 89% | 3376 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,666 psi | 87% | 3445 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,230 psi | 87% | 3396 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 86% | 55,724 psi | 87% | 3294 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 54,447 psi | 85% | 3307 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,638 psi | 90% | 3284 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,115 psi | 88% | 3281 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,666 psi | 89% | 3232 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,740 psi | 90% | 3366 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 57,377 psi | 90% | 3281 fps | 98.9% |
| Somchem S365 | <<locked>> | 84% | 57,276 psi | 90% | 3304 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,897 psi | 86% | 3274 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 57,522 psi | 90% | 3291 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,694 psi | 86% | 3255 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,826 psi | 89% | 3294 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,392 psi | 90% | 3333 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,290 psi | 90% | 3415 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 92% | 54,273 psi | 85% | 3333 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 96% | 55,695 psi | 87% | 3402 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 98% | 56,753 psi | 89% | 3461 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,159 psi | 90% | 3232 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,042 psi | 86% | 3392 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,665 psi | 86% | 3264 fps | 99.6% |
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% | 40,857 psi | 64% | 2979 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 42,322 psi | 66% | 3104 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 44,817 psi | 70% | 3127 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 40,205 psi | 63% | 3045 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 39,421 psi | 62% | 3018 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 31,401 psi | 49% | 2835 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,576 psi | 81% | 3264 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,817 psi | 70% | 3117 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,857 psi | 64% | 3054 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,624 psi | 62% | 3009 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,127 psi | 53% | 2913 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,715 psi | 70% | 3182 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,850 psi | 78% | 3301 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,906 psi | 75% | 3153 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 38,072 psi | 60% | 2982 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 39,233 psi | 61% | 3031 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 40,857 psi | 64% | 3054 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 84% | 37,492 psi | 59% | 2969 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 42,815 psi | 67% | 3054 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,076 psi | 66% | 3035 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,486 psi | 76% | 3127 fps | 100% |
| Hodgdon Retumbo | 93 gr | 82% | 35,795 psi | 56% | 3012 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 1952 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,488 psi | 79% | 3182 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 50,894 psi | 80% | 3192 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,976 psi | 69% | 3051 fps | 96.3% |
| IMR 7828 SSC | 90.6 gr | 80% | 38,870 psi | 61% | 3022 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,579 psi | 59% | 3005 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 54,157 psi | 85% | 3228 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,663 psi | 83% | 3222 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 35,128 psi | 55% | 2838 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 51,401 psi | 81% | 3238 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 32,880 psi | 52% | 2897 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 43,410 psi | 68% | 3140 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 52,446 psi | 82% | 3241 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,827 psi | 61% | 3031 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 51,445 psi | 81% | 3241 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,838 psi | 55% | 2890 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 45% | 1998 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,707 psi | 83% | 3307 fps | 100% |
| ReloadSwiss RS 76 | 97.1 gr | 80% | 32,663 psi | 51% | 2904 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 43,627 psi | 68% | 3159 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 45,876 psi | 72% | 3100 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 44,309 psi | 69% | 3104 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,157 psi | 85% | 3228 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,663 psi | 83% | 3222 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,011 psi | 83% | 3169 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,961 psi | 69% | 3097 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 46,876 psi | 73% | 3084 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 49,922 psi | 78% | 3189 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,860 psi | 70% | 3081 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 53,780 psi | 84% | 3228 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,073 psi | 61% | 2936 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 53,214 psi | 83% | 3235 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,106 psi | 69% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,192 psi | 68% | 3127 fps | 96% |
| Vihtavuori N565 | <<locked>> | 84% | 41,075 psi | 64% | 3051 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 90% | 44,715 psi | 70% | 3179 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 96% | 52,779 psi | 83% | 3386 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,345 psi | 84% | 3173 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,202 psi | 58% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,307 psi | 65% | 2995 fps | 97.3% |
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 62 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Swift Scirocco. Vihtavuori N570 delivers the highest muzzle velocity at 3,461 fps; across all powders the maximum-charge window runs from 2,175 fps to 3,461 fps. ADI AR 2225 gives the best case fill at 100 %, and 62 of the 62 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 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, IMR 8133 Enduron 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, IMR 7828 SSC, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Swift Scirocco 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.