Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 142gr | IBEX TRD bullet and 54 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% | 56,405 psi | 88% | 3333 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,479 psi | 90% | 3494 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 86% | 54,607 psi | 86% | 3422 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 86% | 56,449 psi | 88% | 3415 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 88% | 54,839 psi | 86% | 3422 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 98% | 57,421 psi | 90% | 3451 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 3481 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,898 psi | 89% | 3412 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,536 psi | 89% | 3415 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,333 psi | 88% | 3402 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,637 psi | 87% | 3422 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,464 psi | 90% | 3396 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,450 psi | 90% | 3468 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,331 psi | 85% | 3425 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,869 psi | 88% | 3478 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,637 psi | 87% | 3363 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 55,071 psi | 86% | 3412 fps | 99.4% |
| Bofors RP30 | <<locked>> | 96% | 57,566 psi | 90% | 3474 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 55,637 psi | 87% | 3422 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 94% | 55,042 psi | 86% | 3412 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 86% | 54,375 psi | 85% | 3350 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,898 psi | 89% | 3392 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,087 psi | 89% | 3330 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,246 psi | 88% | 3550 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 59% | 2231 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,332 psi | 87% | 3330 fps | 99.8% |
| IMR 4831 | <<locked>> | 82% | 56,420 psi | 88% | 3346 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,781 psi | 86% | 3327 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 90% | 56,913 psi | 89% | 3468 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3386 fps | 98.7% |
| Lovex S071 | <<locked>> | 92% | 54,679 psi | 86% | 3304 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,637 psi | 89% | 3392 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3415 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 55,738 psi | 87% | 3445 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,725 psi | 90% | 3392 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,230 psi | 85% | 3422 fps | 99% |
| Ramshot Hunter | <<locked>> | 82% | 56,739 psi | 89% | 3399 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,305 psi | 90% | 3419 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 61% | 2283 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,566 psi | 90% | 3543 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,479 psi | 90% | 3494 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 86% | 57,246 psi | 90% | 3379 fps | 99% |
| Rottweil R 905 | <<locked>> | 86% | 56,130 psi | 88% | 3396 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,724 psi | 87% | 3392 fps | 99.5% |
| Somchem S361 | <<locked>> | 84% | 55,347 psi | 87% | 3301 fps | 98.3% |
| Somchem S365 | <<locked>> | 82% | 55,564 psi | 87% | 3343 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,797 psi | 89% | 3366 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 90% | 56,492 psi | 89% | 3340 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 86% | 56,115 psi | 88% | 3373 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,100 psi | 86% | 3435 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 92% | 56,492 psi | 89% | 3432 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 96% | 57,537 psi | 90% | 3491 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,145 psi | 90% | 3491 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,405 psi | 88% | 3353 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% | 43,627 psi | 68% | 3091 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 46,949 psi | 74% | 3281 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 80% | 44,541 psi | 70% | 3209 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 46,412 psi | 73% | 3215 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 41,974 psi | 66% | 3143 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 88% | 41,220 psi | 65% | 3114 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 33,576 psi | 53% | 2946 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,934 psi | 74% | 3219 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,040 psi | 83% | 3356 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,485 psi | 73% | 3209 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,873 psi | 67% | 3156 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,713 psi | 65% | 3110 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,230 psi | 57% | 3022 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,123 psi | 74% | 3291 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 52,025 psi | 82% | 3399 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 52,330 psi | 82% | 3297 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 40,118 psi | 63% | 3087 fps | 96.3% |
| Bofors RP30 | <<locked>> | 84% | 38,899 psi | 61% | 3077 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 42,873 psi | 67% | 3156 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 84% | 39,349 psi | 62% | 3068 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 44,556 psi | 70% | 3146 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,772 psi | 69% | 3127 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,314 psi | 79% | 3215 fps | 100% |
| Hodgdon Retumbo | 91.3 gr | 80% | 35,447 psi | 56% | 3048 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,967 psi | 81% | 3268 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 53,069 psi | 83% | 3291 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,527 psi | 71% | 3136 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,698 psi | 64% | 3120 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,972 psi | 63% | 3120 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 37,985 psi | 60% | 2959 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 52,939 psi | 83% | 3327 fps | 99% |
| Norma 217 | <<locked>> | 86% | 33,330 psi | 52% | 2956 fps | 95% |
| Norma MRP | <<locked>> | 80% | 45,469 psi | 71% | 3241 fps | 99% |
| Norma URP | <<locked>> | 80% | 54,259 psi | 85% | 3333 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,814 psi | 64% | 3133 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 53,113 psi | 83% | 3333 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,173 psi | 58% | 3002 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 46% | 2051 fps | 100% |
| ReloadSwiss RS 76 | 97.8 gr | 80% | 35,027 psi | 55% | 3025 fps | 96.5% |
| ReloadSwiss RS 80 | 110.9 gr | 90% | 46,093 psi | 72% | 3268 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,514 psi | 74% | 3189 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 46,383 psi | 73% | 3202 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,021 psi | 72% | 3199 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 48,689 psi | 76% | 3173 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 52,011 psi | 82% | 3284 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,992 psi | 74% | 3179 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,046 psi | 64% | 3035 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 46,615 psi | 73% | 3202 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,063 psi | 71% | 3225 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 82% | 40,756 psi | 64% | 3094 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 46,847 psi | 73% | 3278 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,508 psi | 62% | 3169 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,236 psi | 68% | 3094 fps | 97.4% |
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 54 powders for .30-378 Weath. Mag. loaded with the .308 | 142gr | IBEX TRD. Hodgdon Retumbo delivers the highest muzzle velocity at 3,550 fps; across all powders the maximum-charge window runs from 2,231 fps to 3,550 fps. ADI AR 2225 gives the best case fill at 100 %, and 54 of the 54 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 142.0 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, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 142gr | 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.