Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 159gr | IBEX TRD bullet and 50 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>> | 86% | 56,043 psi | 88% | 3179 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,188 psi | 90% | 3343 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 54,302 psi | 85% | 3278 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 84% | 55,999 psi | 88% | 3258 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 54,549 psi | 85% | 3271 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 57,159 psi | 90% | 3307 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,041 psi | 85% | 3353 fps | 97.2% |
| ADI AR 2225 | <<locked>> | 98% | 56,347 psi | 88% | 3337 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,318 psi | 88% | 3258 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,782 psi | 87% | 3248 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,463 psi | 87% | 3274 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,246 psi | 90% | 3238 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,479 psi | 90% | 3314 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,244 psi | 85% | 3271 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,970 psi | 88% | 3343 fps | 97.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3340 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,897 psi | 86% | 3219 fps | 97.4% |
| Bofors RP15 | <<locked>> | 88% | 54,868 psi | 86% | 3264 fps | 99.8% |
| Bofors RP30 | <<locked>> | 92% | 54,027 psi | 85% | 3268 fps | 99.6% |
| Bofors RP5 | <<locked>> | 86% | 55,463 psi | 87% | 3274 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 54,781 psi | 86% | 3268 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 57,392 psi | 90% | 3261 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,362 psi | 88% | 3241 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,608 psi | 89% | 3166 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,521 psi | 89% | 3406 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 2119 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,537 psi | 90% | 3235 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 56,768 psi | 89% | 3317 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3314 fps | 99.7% |
| Lovex S071 | <<locked>> | 90% | 54,476 psi | 85% | 3156 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3346 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,579 psi | 87% | 3294 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,215 psi | 85% | 3278 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 90% | 57,087 psi | 89% | 3268 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,943 psi | 61% | 2165 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,566 psi | 90% | 3392 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,464 psi | 90% | 3356 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 56,550 psi | 89% | 3225 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 55,753 psi | 87% | 3245 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,376 psi | 87% | 3238 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 54,476 psi | 85% | 3150 fps | 98.9% |
| Somchem S385 | <<locked>> | 84% | 56,318 psi | 88% | 3212 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,130 psi | 88% | 3192 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 56,072 psi | 88% | 3222 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,853 psi | 86% | 3287 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 90% | 56,362 psi | 88% | 3287 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 57,667 psi | 90% | 3353 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 54,926 psi | 86% | 3350 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,696 psi | 90% | 3337 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,796 psi | 87% | 3202 fps | 99.9% |
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% | 46,325 psi | 73% | 3009 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 49,966 psi | 78% | 3205 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 47,529 psi | 74% | 3140 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 49,298 psi | 77% | 3136 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 44,570 psi | 70% | 3071 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 82% | 36,245 psi | 57% | 2858 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 96% | 50,328 psi | 79% | 3274 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,575 psi | 49% | 2769 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,617 psi | 78% | 3133 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,168 psi | 77% | 3127 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,658 psi | 72% | 3084 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,483 psi | 70% | 3022 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,812 psi | 61% | 2956 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,502 psi | 79% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,443 psi | 76% | 3196 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,907 psi | 77% | 3192 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,571 psi | 71% | 3028 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 42,728 psi | 67% | 3018 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 36,608 psi | 57% | 2887 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 45,658 psi | 72% | 3084 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 36,724 psi | 58% | 2877 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 47,166 psi | 74% | 3068 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,369 psi | 73% | 3051 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,156 psi | 83% | 3114 fps | 100% |
| Hodgdon Retumbo | 89.7 gr | 80% | 37,913 psi | 59% | 3002 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,616 psi | 45% | 1900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,979 psi | 75% | 3058 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 43,395 psi | 68% | 3054 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,840 psi | 59% | 2940 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 40,422 psi | 63% | 2884 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 31,618 psi | 50% | 2785 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 48,501 psi | 76% | 3163 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 43,830 psi | 69% | 3071 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 39,900 psi | 63% | 2943 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,428 psi | 46% | 1946 fps | 100% |
| ReloadSwiss RS 76 | 96 gr | 80% | 37,478 psi | 59% | 2979 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 40,103 psi | 63% | 3002 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 49,980 psi | 78% | 3104 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 49,124 psi | 77% | 3120 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,762 psi | 76% | 3117 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 51,242 psi | 80% | 3091 fps | 98.4% |
| Somchem S385 | <<locked>> | 80% | 49,719 psi | 78% | 3094 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 43,526 psi | 68% | 2956 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 49,501 psi | 78% | 3110 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,950 psi | 75% | 3153 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 40,872 psi | 64% | 2969 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 86% | 43,874 psi | 69% | 3081 fps | 95.9% |
| Vihtavuori N570 | 104.8 gr | 90% | 47,950 psi | 75% | 3209 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,207 psi | 68% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,847 psi | 72% | 3018 fps | 98.8% |
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 50 powders for .30-378 Weath. Mag. loaded with the .308 | 159gr | IBEX TRD. Hodgdon Retumbo delivers the highest muzzle velocity at 3,406 fps; across all powders the maximum-charge window runs from 2,119 fps to 3,406 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 50 of the 50 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 159.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 159gr | IBEX TRD 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.