Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 145gr | SUS-TAC HPT bullet and 66 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>> | 90% | 56,260 psi | 88% | 3314 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,623 psi | 89% | 3353 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,099 psi | 85% | 3412 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 88% | 55,158 psi | 86% | 3419 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 88% | 57,624 psi | 90% | 3419 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 55,883 psi | 88% | 3422 fps | 99% |
| ADI AR 2217 | <<locked>> | 98% | 54,375 psi | 85% | 3383 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,881 psi | 83% | 3402 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,508 psi | 90% | 3412 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,130 psi | 90% | 3402 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,289 psi | 88% | 3415 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,201 psi | 85% | 3327 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,128 psi | 85% | 3392 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,737 psi | 86% | 3415 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 3468 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,942 psi | 89% | 3369 fps | 97% |
| Bofors RP15 | <<locked>> | 92% | 55,477 psi | 87% | 3402 fps | 99.5% |
| Bofors RP30 | <<locked>> | 96% | 54,114 psi | 85% | 3396 fps | 99.1% |
| Bofors RP5 | <<locked>> | 90% | 56,289 psi | 88% | 3415 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 57,711 psi | 90% | 3346 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 55,927 psi | 88% | 3412 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 88% | 55,317 psi | 87% | 3350 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,186 psi | 85% | 3330 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,099 psi | 85% | 3264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,826 psi | 89% | 3543 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 59% | 2205 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,376 psi | 88% | 3333 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 56,898 psi | 89% | 3337 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,869 psi | 88% | 3330 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 90% | 54,027 psi | 85% | 3396 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,225 psi | 76% | 3294 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 56,478 psi | 89% | 3310 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,056 psi | 86% | 3307 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,114 psi | 85% | 3281 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,711 psi | 90% | 3396 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 49,066 psi | 77% | 3327 fps | 99.6% |
| Norma MRP | <<locked>> | 88% | 56,260 psi | 88% | 3435 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,839 psi | 86% | 3327 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,071 psi | 86% | 3419 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 57,551 psi | 90% | 3392 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,766 psi | 84% | 3340 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,319 psi | 60% | 2257 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,884 psi | 89% | 3369 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,376 psi | 87% | 3396 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,998 psi | 85% | 3461 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,417 psi | 84% | 3406 fps | 98% |
| Rottweil R 904 | <<locked>> | 86% | 54,636 psi | 86% | 3317 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 56,869 psi | 89% | 3392 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 57,711 psi | 90% | 3346 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,478 psi | 89% | 3310 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,056 psi | 86% | 3307 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,651 psi | 87% | 3258 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,449 psi | 88% | 3389 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 56,289 psi | 88% | 3304 fps | 98.6% |
| Somchem S365 | <<locked>> | 84% | 55,999 psi | 88% | 3330 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,290 psi | 90% | 3360 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 56,420 psi | 88% | 3320 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,130 psi | 90% | 3337 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,709 psi | 87% | 3323 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,101 psi | 88% | 3360 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,782 psi | 87% | 3432 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,666 psi | 89% | 3415 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 96% | 54,157 psi | 85% | 3412 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,014 psi | 88% | 3258 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,551 psi | 90% | 3474 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,319 psi | 90% | 3350 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,900 psi | 63% | 2995 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 52,779 psi | 83% | 3287 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,584 psi | 68% | 3189 fps | 96.4% |
| Accurate MAGPRO | <<locked>> | 82% | 44,396 psi | 70% | 3192 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,830 psi | 69% | 3143 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 42,177 psi | 66% | 3133 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 41,191 psi | 65% | 3097 fps | 96% |
| ADI AR 2225 | <<locked>> | 86% | 32,677 psi | 51% | 2907 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,270 psi | 79% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,830 psi | 69% | 3136 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,885 psi | 63% | 3071 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,464 psi | 60% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,257 psi | 52% | 2923 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,424 psi | 68% | 3196 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 52,199 psi | 82% | 3389 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,038 psi | 78% | 3235 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 37,014 psi | 58% | 2992 fps | 95.2% |
| Bofors RP30 | <<locked>> | 86% | 38,145 psi | 60% | 3045 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,885 psi | 63% | 3071 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 54,143 psi | 85% | 3284 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 39,160 psi | 61% | 3051 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 41,901 psi | 66% | 3071 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 44,121 psi | 69% | 3123 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,485 psi | 74% | 3153 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 34,853 psi | 55% | 3018 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,992 psi | 44% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,559 psi | 78% | 3205 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 49,806 psi | 78% | 3215 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,134 psi | 68% | 3071 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 82% | 40,770 psi | 64% | 3110 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,131 psi | 61% | 3084 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,040 psi | 83% | 3251 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,561 psi | 81% | 3245 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 34,287 psi | 54% | 2851 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 50,227 psi | 79% | 3255 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 34,185 psi | 54% | 2972 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 42,163 psi | 66% | 3153 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 51,227 psi | 80% | 3264 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,698 psi | 64% | 3117 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 50,198 psi | 79% | 3261 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,881 psi | 53% | 2900 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 45% | 2028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,968 psi | 83% | 3304 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,474 psi | 81% | 3330 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 34,214 psi | 54% | 2989 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 45,658 psi | 72% | 3245 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 44,846 psi | 70% | 3117 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 43,294 psi | 68% | 3120 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 80% | 54,143 psi | 85% | 3284 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,040 psi | 83% | 3251 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,561 psi | 81% | 3245 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,069 psi | 82% | 3192 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,946 psi | 67% | 3117 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 45,919 psi | 72% | 3100 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 48,791 psi | 76% | 3212 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,903 psi | 69% | 3100 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 52,678 psi | 83% | 3258 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,189 psi | 60% | 2953 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 80% | 52,141 psi | 82% | 3258 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,917 psi | 67% | 3114 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,974 psi | 66% | 3140 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 42,917 psi | 67% | 3136 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 46,659 psi | 73% | 3258 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,257 psi | 82% | 3199 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,752 psi | 56% | 3061 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,350 psi | 63% | 3012 fps | 96.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 71 powders for .30-378 Weath. Mag. loaded with the .308 | 145gr | SUS-TAC HPT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,543 fps; across all powders the maximum-charge window runs from 2,205 fps to 3,543 fps. ADI AR 2218 gives the best case fill at 100 %, and 71 of the 71 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 145.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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 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.