Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | NorthFork Bonded Core bullet and 58 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% | 55,114 psi | 86% | 3255 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,884 psi | 89% | 3422 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 86% | 53,940 psi | 85% | 3350 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 86% | 56,362 psi | 88% | 3350 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 54,694 psi | 86% | 3356 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 57,348 psi | 90% | 3392 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 3425 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3412 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,289 psi | 88% | 3343 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,912 psi | 88% | 3337 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,187 psi | 86% | 3353 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,811 psi | 89% | 3317 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,217 psi | 90% | 3392 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 53,577 psi | 84% | 3343 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,651 psi | 87% | 3412 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,521 psi | 87% | 3307 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 54,549 psi | 85% | 3340 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 57,072 psi | 89% | 3402 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 55,187 psi | 86% | 3353 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 54,955 psi | 86% | 3353 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 86% | 53,911 psi | 84% | 3284 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,666 psi | 89% | 3333 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,449 psi | 88% | 3258 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,231 psi | 88% | 3484 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 2182 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,984 psi | 86% | 3264 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,608 psi | 87% | 3271 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,534 psi | 85% | 3264 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,811 psi | 89% | 3402 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,285 psi | 80% | 3310 fps | 98.9% |
| Lovex S070 | <<locked>> | 82% | 57,188 psi | 90% | 3301 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,782 psi | 89% | 3281 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,260 psi | 88% | 3327 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 52,330 psi | 82% | 3343 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,245 psi | 87% | 3369 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,174 psi | 90% | 3320 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,012 psi | 85% | 3356 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,260 psi | 88% | 3323 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,913 psi | 89% | 3346 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 60% | 2231 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,392 psi | 90% | 3471 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,985 psi | 89% | 3425 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 56,898 psi | 89% | 3317 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 55,521 psi | 87% | 3327 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,188 psi | 90% | 3301 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,682 psi | 90% | 3248 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,129 psi | 86% | 3320 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 54,795 psi | 86% | 3238 fps | 98.7% |
| Somchem S365 | <<locked>> | 82% | 54,824 psi | 86% | 3264 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,072 psi | 88% | 3294 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,985 psi | 88% | 3274 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,158 psi | 86% | 3297 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,694 psi | 86% | 3366 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,724 psi | 87% | 3356 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 57,276 psi | 90% | 3425 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 96% | 54,418 psi | 85% | 3415 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,942 psi | 89% | 3412 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,927 psi | 88% | 3287 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,930 psi | 66% | 3002 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 45,948 psi | 72% | 3199 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 80% | 43,453 psi | 68% | 3130 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 45,919 psi | 72% | 3150 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 41,220 psi | 65% | 3071 fps | 96% |
| ADI AR 2217 | <<locked>> | 86% | 37,681 psi | 59% | 2969 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 50,169 psi | 79% | 3340 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 32,155 psi | 50% | 2858 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,707 psi | 83% | 3284 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,847 psi | 72% | 3140 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,930 psi | 66% | 3077 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,625 psi | 64% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,099 psi | 55% | 2936 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,050 psi | 72% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 51,532 psi | 81% | 3330 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,834 psi | 77% | 3173 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,957 psi | 61% | 3005 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 37,608 psi | 59% | 2986 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,930 psi | 66% | 3077 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 84% | 38,348 psi | 60% | 2992 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 43,816 psi | 69% | 3074 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,033 psi | 67% | 3058 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,545 psi | 78% | 3143 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,258 psi | 54% | 2963 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 44% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,561 psi | 81% | 3202 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 52,054 psi | 82% | 3212 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,918 psi | 70% | 3074 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 39,885 psi | 63% | 3048 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,798 psi | 61% | 3035 fps | 95.6% |
| Lovex S070 | <<locked>> | 80% | 53,650 psi | 84% | 3238 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,056 psi | 56% | 2861 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 52,489 psi | 82% | 3258 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 34,040 psi | 53% | 2923 fps | 96% |
| Norma MRP | <<locked>> | 80% | 44,512 psi | 70% | 3159 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 53,505 psi | 84% | 3261 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,856 psi | 62% | 3054 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 52,533 psi | 82% | 3261 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,911 psi | 56% | 2917 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 45% | 2005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,591 psi | 53% | 2930 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,727 psi | 65% | 3110 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 46,789 psi | 73% | 3123 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 45,397 psi | 71% | 3127 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 80% | 53,650 psi | 84% | 3238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,041 psi | 85% | 3186 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,063 psi | 71% | 3120 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 47,848 psi | 75% | 3107 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 51,213 psi | 80% | 3205 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,905 psi | 72% | 3104 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 80% | 40,001 psi | 63% | 2956 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 45,136 psi | 71% | 3114 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,237 psi | 69% | 3150 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 82% | 39,378 psi | 62% | 3009 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 46,108 psi | 72% | 3205 fps | 96% |
| Vihtavuori N570 | <<locked>> | 94% | 50,546 psi | 79% | 3340 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,493 psi | 60% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,279 psi | 66% | 3018 fps | 97.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 65 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | NorthFork Bonded Core. Hodgdon Retumbo delivers the highest muzzle velocity at 3,484 fps; across all powders the maximum-charge window runs from 2,182 fps to 3,484 fps. Accurate 8700 gives the best case fill at 100 %, and 65 of the 65 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 150.0 gr projectile in 0.308" calls for a 1:14.0 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, 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.