Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 139gr | IBEX TRD bullet and 53 powders. The key underlying parameters are shown in the table above.
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% | 56,463 psi | 88% | 3360 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,319 psi | 90% | 3517 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 86% | 54,592 psi | 86% | 3448 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 86% | 56,420 psi | 88% | 3438 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 88% | 54,882 psi | 86% | 3448 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 98% | 57,305 psi | 90% | 3478 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 3507 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,434 psi | 88% | 3442 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,289 psi | 88% | 3432 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,724 psi | 87% | 3451 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,334 psi | 90% | 3422 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,406 psi | 90% | 3494 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,331 psi | 85% | 3451 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,898 psi | 88% | 3501 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,564 psi | 87% | 3386 fps | 96.4% |
| Bofors RP15 | <<locked>> | 90% | 54,955 psi | 86% | 3435 fps | 99.4% |
| Bofors RP30 | <<locked>> | 96% | 57,522 psi | 90% | 3497 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 55,724 psi | 87% | 3451 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 94% | 54,998 psi | 86% | 3438 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 86% | 54,288 psi | 85% | 3373 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,985 psi | 89% | 3422 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,014 psi | 89% | 3356 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,159 psi | 88% | 3576 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 2257 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,230 psi | 87% | 3356 fps | 99.8% |
| IMR 4831 | <<locked>> | 82% | 56,260 psi | 88% | 3373 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,752 psi | 86% | 3353 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 90% | 56,985 psi | 89% | 3494 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,808 psi | 81% | 3406 fps | 98.5% |
| Lovex S071 | <<locked>> | 92% | 54,636 psi | 86% | 3330 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,449 psi | 88% | 3419 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 3442 fps | 99.8% |
| Norma MRP | <<locked>> | 86% | 55,637 psi | 87% | 3468 fps | 99.9% |
| Norma URP | <<locked>> | 82% | 57,580 psi | 90% | 3419 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,230 psi | 85% | 3448 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 82% | 56,594 psi | 89% | 3422 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,203 psi | 90% | 3438 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 2310 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,537 psi | 90% | 3570 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,363 psi | 90% | 3517 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 86% | 57,246 psi | 90% | 3406 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,101 psi | 88% | 3422 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,695 psi | 87% | 3419 fps | 99.5% |
| Somchem S361 | <<locked>> | 84% | 55,201 psi | 87% | 3323 fps | 98.2% |
| Somchem S365 | <<locked>> | 82% | 55,390 psi | 87% | 3369 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,753 psi | 89% | 3389 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 90% | 56,347 psi | 88% | 3363 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 86% | 56,086 psi | 88% | 3406 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,998 psi | 86% | 3461 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 92% | 56,420 psi | 88% | 3455 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 96% | 57,522 psi | 90% | 3517 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,101 psi | 89% | 3520 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,420 psi | 88% | 3379 fps | 99.5% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,700 psi | 68% | 3117 fps | 99.2% |
| Accurate High Country | <<locked>> | 80% | 46,949 psi | 74% | 3307 fps | 97.1% |
| Accurate MAGPRO | <<locked>> | 80% | 44,498 psi | 70% | 3235 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 46,470 psi | 73% | 3241 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 41,989 psi | 66% | 3166 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 41,292 psi | 65% | 3136 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 33,533 psi | 53% | 2969 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,997 psi | 83% | 3383 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,557 psi | 73% | 3238 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,888 psi | 67% | 3182 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,669 psi | 65% | 3136 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,260 psi | 57% | 3045 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,036 psi | 74% | 3317 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 51,967 psi | 81% | 3425 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 52,199 psi | 82% | 3320 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 40,045 psi | 63% | 3110 fps | 96.1% |
| Bofors RP30 | <<locked>> | 84% | 38,885 psi | 61% | 3100 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 42,888 psi | 67% | 3182 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 84% | 39,349 psi | 62% | 3091 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 44,556 psi | 70% | 3169 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,787 psi | 69% | 3153 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,299 psi | 79% | 3245 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,462 psi | 56% | 3074 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 45% | 2028 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,083 psi | 82% | 3301 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 52,982 psi | 83% | 3317 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,585 psi | 71% | 3163 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 80% | 40,727 psi | 64% | 3143 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,900 psi | 63% | 3140 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 37,956 psi | 59% | 2982 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 52,982 psi | 83% | 3353 fps | 99% |
| Norma 217 | <<locked>> | 88% | 35,462 psi | 56% | 3045 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 45,440 psi | 71% | 3268 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 54,186 psi | 85% | 3363 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,799 psi | 64% | 3156 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 53,142 psi | 83% | 3360 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,144 psi | 58% | 3025 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 46% | 2077 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,954 psi | 55% | 3045 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 45,977 psi | 72% | 3291 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 47,456 psi | 74% | 3215 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 46,296 psi | 73% | 3228 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,948 psi | 72% | 3222 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 48,675 psi | 76% | 3199 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 52,069 psi | 82% | 3314 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,050 psi | 74% | 3205 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,104 psi | 64% | 3061 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 80% | 46,557 psi | 73% | 3228 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,034 psi | 71% | 3251 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 84% | 43,555 psi | 68% | 3189 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 90% | 46,818 psi | 73% | 3304 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,479 psi | 62% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,236 psi | 68% | 3117 fps | 97.2% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 61 powders for .30-378 Weath. Mag. loaded with the .308 | 139gr | IBEX TRD. Hodgdon Retumbo delivers the highest muzzle velocity at 3,576 fps; across all powders the maximum-charge window runs from 2,257 fps to 3,576 fps. ADI AR 2218 gives the best case fill at 100 %, and 61 of the 61 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 139.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. As outliers, Alliant Reloder-50, 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.