Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Swift A-Frame bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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% | 55,825 psi | 87% | 3261 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,824 psi | 86% | 3369 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 56,927 psi | 89% | 3360 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,434 psi | 87% | 3369 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 54,201 psi | 85% | 3337 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 3445 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,014 psi | 89% | 3425 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,985 psi | 89% | 3356 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,623 psi | 89% | 3350 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,912 psi | 88% | 3363 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,041 psi | 85% | 3274 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,288 psi | 85% | 3343 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,563 psi | 86% | 3360 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,550 psi | 89% | 3428 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,188 psi | 88% | 3317 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 55,274 psi | 87% | 3350 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 54,157 psi | 85% | 3350 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 55,912 psi | 88% | 3363 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,796 psi | 87% | 3363 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,578 psi | 86% | 3294 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,334 psi | 90% | 3343 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,246 psi | 90% | 3268 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,203 psi | 90% | 3497 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,579 psi | 87% | 3278 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,217 psi | 88% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,042 psi | 86% | 3274 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 57,725 psi | 90% | 3415 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3327 fps | 99.1% |
| Lovex S071 | <<locked>> | 94% | 57,653 psi | 90% | 3294 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,826 psi | 89% | 3337 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 53,200 psi | 83% | 3356 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,999 psi | 88% | 3383 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,984 psi | 86% | 3373 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 56,811 psi | 89% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 53,679 psi | 84% | 3294 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,085 psi | 85% | 3412 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,708 psi | 84% | 3363 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,609 psi | 90% | 3330 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,289 psi | 88% | 3340 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,898 psi | 88% | 3333 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,390 psi | 87% | 3248 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,550 psi | 87% | 3274 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,768 psi | 89% | 3307 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,666 psi | 89% | 3287 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,796 psi | 87% | 3304 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,434 psi | 87% | 3379 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,550 psi | 89% | 3373 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 54,273 psi | 85% | 3369 fps | 98.1% |
| Vihtavuori N570 | <<locked>> | 96% | 55,405 psi | 87% | 3435 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,853 psi | 84% | 3363 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,753 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% | 42,496 psi | 67% | 3012 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 44,164 psi | 69% | 3143 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,499 psi | 73% | 3159 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,756 psi | 65% | 3084 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 38,261 psi | 60% | 2986 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 50,966 psi | 80% | 3356 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 32,706 psi | 51% | 2871 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,417 psi | 84% | 3297 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,412 psi | 73% | 3153 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,482 psi | 67% | 3091 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,220 psi | 65% | 3038 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,636 psi | 56% | 2949 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,847 psi | 73% | 3219 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,559 psi | 76% | 3268 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,327 psi | 77% | 3186 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,523 psi | 62% | 3018 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 38,305 psi | 60% | 3002 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,482 psi | 67% | 3091 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,318 psi | 57% | 2936 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 44,367 psi | 70% | 3091 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,598 psi | 68% | 3071 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,227 psi | 79% | 3153 fps | 100% |
| Hodgdon Retumbo | 93.7 gr | 80% | 34,766 psi | 54% | 2979 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 44% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,127 psi | 82% | 3215 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,678 psi | 83% | 3222 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,426 psi | 71% | 3084 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,480 psi | 63% | 3061 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,436 psi | 62% | 3045 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 36,492 psi | 57% | 2871 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 53,040 psi | 83% | 3268 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,285 psi | 51% | 2867 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 45,121 psi | 71% | 3173 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 40,451 psi | 63% | 3071 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 53,113 psi | 83% | 3271 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,535 psi | 57% | 2933 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 2008 fps | 100% |
| ReloadSwiss RS 76 | 100.3 gr | 80% | 34,171 psi | 54% | 2946 fps | 96.8% |
| ReloadSwiss RS 80 | 111.2 gr | 88% | 42,525 psi | 67% | 3127 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 47,340 psi | 74% | 3133 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,006 psi | 72% | 3140 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,658 psi | 72% | 3133 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 48,457 psi | 76% | 3117 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,909 psi | 81% | 3215 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,456 psi | 73% | 3114 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,567 psi | 64% | 2969 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 45,803 psi | 72% | 3127 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,817 psi | 70% | 3163 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,929 psi | 63% | 3018 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 43,497 psi | 68% | 3146 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 51,517 psi | 81% | 3356 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,233 psi | 61% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,786 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 60 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,497 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,497 fps. Accurate 8700 gives the best case fill at 100 %, and 60 of the 60 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 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.