Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | SUS-TAC HP bullet and 60 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% | 54,520 psi | 85% | 3202 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,188 psi | 88% | 3366 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 88% | 57,319 psi | 90% | 3373 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 86% | 55,651 psi | 87% | 3294 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,157 psi | 85% | 3307 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 56,608 psi | 89% | 3337 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3373 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,158 psi | 86% | 3356 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,782 psi | 87% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,419 psi | 87% | 3287 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,621 psi | 86% | 3304 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,173 psi | 88% | 3268 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,434 psi | 88% | 3340 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,159 psi | 90% | 3363 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,563 psi | 86% | 3356 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,027 psi | 86% | 3258 fps | 97.2% |
| Bofors RP15 | <<locked>> | 92% | 57,479 psi | 90% | 3350 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 56,289 psi | 88% | 3350 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 54,621 psi | 86% | 3304 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 54,143 psi | 85% | 3297 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 57,145 psi | 90% | 3301 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,115 psi | 88% | 3281 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,086 psi | 88% | 3205 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,463 psi | 87% | 3432 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 59% | 2139 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,520 psi | 85% | 3215 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,071 psi | 86% | 3222 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,595 psi | 90% | 3278 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 90% | 56,289 psi | 88% | 3353 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,531 psi | 79% | 3261 fps | 98.9% |
| Lovex S070 | <<locked>> | 82% | 56,681 psi | 89% | 3248 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,188 psi | 88% | 3228 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,709 psi | 87% | 3274 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 3291 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,505 psi | 85% | 3320 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,594 psi | 89% | 3268 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,493 psi | 90% | 3376 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 55,695 psi | 87% | 3274 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,144 psi | 88% | 3297 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 2192 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,566 psi | 90% | 3343 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,565 psi | 89% | 3419 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,970 psi | 88% | 3369 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 56,376 psi | 88% | 3264 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 54,998 psi | 86% | 3274 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,681 psi | 89% | 3248 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,217 psi | 90% | 3196 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,592 psi | 86% | 3268 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 54,201 psi | 85% | 3186 fps | 98.7% |
| Somchem S365 | <<locked>> | 82% | 54,288 psi | 85% | 3212 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,463 psi | 87% | 3241 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,376 psi | 87% | 3225 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,493 psi | 90% | 3261 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,520 psi | 85% | 3245 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,027 psi | 85% | 3314 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,071 psi | 86% | 3307 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 56,507 psi | 89% | 3376 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 57,595 psi | 90% | 3438 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,057 psi | 88% | 3360 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,288 psi | 87% | 3235 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,524 psi | 65% | 2956 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 45,353 psi | 71% | 3153 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 80% | 42,975 psi | 67% | 3081 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 45,469 psi | 71% | 3100 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 40,741 psi | 64% | 3022 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 37,275 psi | 58% | 2927 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 49,385 psi | 77% | 3287 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 31,792 psi | 50% | 2815 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,156 psi | 82% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,484 psi | 71% | 3094 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,423 psi | 65% | 3031 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,147 psi | 63% | 2979 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,708 psi | 54% | 2894 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,484 psi | 71% | 3159 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,560 psi | 79% | 3278 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,370 psi | 76% | 3127 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 38,551 psi | 60% | 2959 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 37,115 psi | 58% | 2943 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 41,423 psi | 65% | 3031 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 82% | 35,389 psi | 55% | 2877 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 43,381 psi | 68% | 3028 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,583 psi | 67% | 3009 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,023 psi | 77% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,794 psi | 53% | 2917 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,169 psi | 80% | 3153 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,619 psi | 81% | 3159 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,570 psi | 70% | 3025 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,407 psi | 62% | 2999 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,203 psi | 60% | 2989 fps | 95.6% |
| Lovex S070 | <<locked>> | 80% | 53,214 psi | 83% | 3189 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,665 psi | 56% | 2815 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 52,025 psi | 82% | 3209 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 33,518 psi | 53% | 2881 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 43,932 psi | 69% | 3110 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 53,040 psi | 83% | 3209 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,436 psi | 62% | 3009 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 52,083 psi | 82% | 3212 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,418 psi | 56% | 2871 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 45% | 1965 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,490 psi | 84% | 3278 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,199 psi | 52% | 2890 fps | 96.6% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,017 psi | 64% | 3064 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 46,369 psi | 73% | 3071 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 44,991 psi | 71% | 3081 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 53,214 psi | 83% | 3189 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,679 psi | 84% | 3140 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,643 psi | 70% | 3074 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 47,427 psi | 74% | 3058 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 50,734 psi | 80% | 3156 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,426 psi | 71% | 3054 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 80% | 39,668 psi | 62% | 2913 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 80% | 53,809 psi | 84% | 3202 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,657 psi | 70% | 3068 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,685 psi | 68% | 3100 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 38,899 psi | 61% | 2963 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 45,310 psi | 71% | 3153 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 94% | 49,821 psi | 78% | 3287 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,971 psi | 60% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,843 psi | 66% | 2972 fps | 97.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 67 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | SUS-TAC HP. Vihtavuori N570 delivers the highest muzzle velocity at 3,438 fps; across all powders the maximum-charge window runs from 2,139 fps to 3,438 fps. Accurate 8700 gives the best case fill at 100 %, and 67 of the 67 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 155.0 gr projectile in 0.308" calls for a 1:11.5 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. 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.