Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | CutEdge MTAC bullet and 65 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% | 57,377 psi | 90% | 3251 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,711 psi | 90% | 3281 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,521 psi | 87% | 3356 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 88% | 56,623 psi | 89% | 3363 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 86% | 55,259 psi | 87% | 3294 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 57,479 psi | 90% | 3369 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 98% | 56,014 psi | 88% | 3330 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 3360 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 3353 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,332 psi | 87% | 3287 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,824 psi | 86% | 3278 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,740 psi | 90% | 3356 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,579 psi | 87% | 3261 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,811 psi | 87% | 3333 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,362 psi | 88% | 3353 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,983 psi | 85% | 3346 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,621 psi | 86% | 3251 fps | 97.2% |
| Bofors RP15 | <<locked>> | 92% | 56,913 psi | 89% | 3343 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,637 psi | 87% | 3340 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 57,740 psi | 90% | 3356 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 57,653 psi | 90% | 3360 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,695 psi | 89% | 3294 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,506 psi | 87% | 3274 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,448 psi | 87% | 3199 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,868 psi | 86% | 3422 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,405 psi | 59% | 2142 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,551 psi | 90% | 3268 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,375 psi | 85% | 3212 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,058 psi | 89% | 3271 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 90% | 55,782 psi | 87% | 3346 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,690 psi | 78% | 3245 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 57,595 psi | 90% | 3245 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,014 psi | 88% | 3241 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,303 psi | 87% | 3219 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,158 psi | 86% | 3268 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 50,676 psi | 79% | 3278 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 53,882 psi | 84% | 3310 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,999 psi | 88% | 3261 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,884 psi | 89% | 3366 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 55,071 psi | 86% | 3264 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,390 psi | 87% | 3284 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 60% | 2192 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,913 psi | 89% | 3337 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,941 psi | 88% | 3409 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,332 psi | 87% | 3363 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 86% | 55,825 psi | 87% | 3258 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 54,491 psi | 85% | 3268 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,595 psi | 90% | 3245 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,014 psi | 88% | 3241 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,623 psi | 89% | 3192 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,114 psi | 85% | 3264 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 57,435 psi | 90% | 3245 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 57,305 psi | 90% | 3261 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,839 psi | 86% | 3235 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,566 psi | 90% | 3251 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,766 psi | 86% | 3215 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 56,811 psi | 89% | 3255 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,319 psi | 90% | 3291 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,479 psi | 90% | 3379 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 92% | 54,215 psi | 85% | 3291 fps | 99% |
| Vihtavuori N568 | <<locked>> | 96% | 55,840 psi | 88% | 3366 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 98% | 56,971 psi | 89% | 3428 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,290 psi | 90% | 3192 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,332 psi | 87% | 3350 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,723 psi | 86% | 3228 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,422 psi | 63% | 2936 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 53,722 psi | 84% | 3219 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,730 psi | 70% | 3136 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 80% | 42,177 psi | 66% | 3064 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 44,817 psi | 70% | 3087 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 40,147 psi | 63% | 3012 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 39,305 psi | 62% | 2982 fps | 96.1% |
| ADI AR 2218 | <<locked>> | 98% | 48,718 psi | 76% | 3274 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 31,082 psi | 49% | 2792 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,692 psi | 81% | 3225 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,759 psi | 70% | 3077 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,712 psi | 64% | 3018 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,421 psi | 62% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,895 psi | 53% | 2871 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,599 psi | 70% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,951 psi | 78% | 3264 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,950 psi | 75% | 3120 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,753 psi | 59% | 2940 fps | 96.2% |
| Bofors RP30 | <<locked>> | 86% | 39,030 psi | 61% | 2992 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 40,712 psi | 64% | 3018 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 84% | 37,318 psi | 58% | 2933 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 42,772 psi | 67% | 3015 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,974 psi | 66% | 2999 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,457 psi | 76% | 3087 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,083 psi | 52% | 2897 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 44% | 1923 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,531 psi | 79% | 3146 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,749 psi | 80% | 3150 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,932 psi | 69% | 3015 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,783 psi | 61% | 2986 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,391 psi | 59% | 2966 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 54,056 psi | 85% | 3186 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,402 psi | 82% | 3179 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,606 psi | 54% | 2792 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 51,459 psi | 81% | 3199 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,561 psi | 51% | 2851 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 43,308 psi | 68% | 3097 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 52,272 psi | 82% | 3199 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,725 psi | 61% | 2995 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 51,459 psi | 81% | 3205 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,592 psi | 54% | 2851 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 45% | 1969 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,852 psi | 83% | 3271 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,358 psi | 51% | 2864 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 43,555 psi | 68% | 3120 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,847 psi | 72% | 3064 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 44,193 psi | 69% | 3064 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,056 psi | 85% | 3186 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,402 psi | 82% | 3179 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,895 psi | 83% | 3130 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,859 psi | 69% | 3061 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 46,789 psi | 73% | 3048 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 49,879 psi | 78% | 3146 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,672 psi | 70% | 3041 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 53,795 psi | 84% | 3189 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,856 psi | 61% | 2897 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 53,156 psi | 83% | 3196 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,816 psi | 69% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,105 psi | 68% | 3087 fps | 96.3% |
| Vihtavuori N565 | <<locked>> | 84% | 40,799 psi | 64% | 3012 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 44,672 psi | 70% | 3140 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 49,052 psi | 77% | 3274 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,417 psi | 84% | 3133 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,115 psi | 58% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,147 psi | 64% | 2959 fps | 97.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 72 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | CutEdge MTAC. Vihtavuori N570 delivers the highest muzzle velocity at 3,428 fps; across all powders the maximum-charge window runs from 2,142 fps to 3,428 fps. Accurate 8700 gives the best case fill at 100 %, and 72 of the 72 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 1:12.0 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, 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.