Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | RWS Kegelspitz bullet and 54 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% | 56,449 psi | 88% | 3271 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,244 psi | 85% | 3369 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 86% | 55,405 psi | 87% | 3376 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 86% | 57,580 psi | 90% | 3369 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,072 psi | 88% | 3383 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 54,781 psi | 86% | 3346 fps | 99.5% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3458 fps | 97.3% |
| ADI AR 2225 | <<locked>> | 98% | 53,737 psi | 84% | 3369 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,508 psi | 90% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,058 psi | 89% | 3356 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,536 psi | 89% | 3376 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,549 psi | 85% | 3281 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,940 psi | 86% | 3356 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,216 psi | 87% | 3369 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,479 psi | 90% | 3442 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,681 psi | 89% | 3330 fps | 97.5% |
| Bofors RP15 | <<locked>> | 90% | 55,883 psi | 88% | 3363 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 54,752 psi | 86% | 3360 fps | 99.5% |
| Bofors RP5 | <<locked>> | 88% | 56,536 psi | 89% | 3376 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 56,391 psi | 88% | 3373 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 55,187 psi | 86% | 3304 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,085 psi | 85% | 3284 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,624 psi | 90% | 3274 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 53,809 psi | 84% | 3438 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2192 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,999 psi | 88% | 3284 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,739 psi | 89% | 3287 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,579 psi | 87% | 3284 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 88% | 54,375 psi | 85% | 3356 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3337 fps | 99.2% |
| Lovex S071 | <<locked>> | 92% | 54,549 psi | 85% | 3241 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,290 psi | 90% | 3343 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3369 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,652 psi | 89% | 3392 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,463 psi | 87% | 3379 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 57,276 psi | 90% | 3340 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,273 psi | 85% | 3304 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,911 psi | 86% | 3425 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,462 psi | 85% | 3376 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 84% | 54,433 psi | 85% | 3271 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 56,768 psi | 89% | 3346 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,362 psi | 88% | 3340 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,912 psi | 88% | 3255 fps | 98.9% |
| Somchem S365 | <<locked>> | 82% | 56,115 psi | 88% | 3281 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,217 psi | 90% | 3310 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,217 psi | 90% | 3294 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,304 psi | 88% | 3314 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,028 psi | 88% | 3392 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 57,130 psi | 90% | 3379 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 54,868 psi | 86% | 3379 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 96% | 56,202 psi | 88% | 3448 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,433 psi | 85% | 3369 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,174 psi | 90% | 3307 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,946 psi | 67% | 3022 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 47,021 psi | 74% | 3222 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 44,599 psi | 70% | 3153 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 46,818 psi | 73% | 3166 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 42,177 psi | 66% | 3094 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 38,624 psi | 61% | 2995 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 51,576 psi | 81% | 3373 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 82% | 30,821 psi | 48% | 2808 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,780 psi | 84% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,862 psi | 73% | 3159 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,960 psi | 67% | 3100 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,597 psi | 65% | 3041 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,926 psi | 56% | 2956 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,340 psi | 74% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,255 psi | 77% | 3281 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,748 psi | 78% | 3196 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 39,842 psi | 62% | 3025 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 38,725 psi | 61% | 3015 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 42,960 psi | 67% | 3100 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 36,608 psi | 57% | 2946 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,773 psi | 70% | 3097 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,005 psi | 69% | 3081 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,575 psi | 79% | 3159 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,186 psi | 55% | 2992 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 44% | 1965 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,417 psi | 82% | 3222 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 53,040 psi | 83% | 3228 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,716 psi | 72% | 3091 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 40,915 psi | 64% | 3071 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,275 psi | 58% | 2989 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 36,941 psi | 58% | 2881 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 53,505 psi | 84% | 3278 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 32,692 psi | 51% | 2881 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 45,600 psi | 71% | 3182 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 40,915 psi | 64% | 3081 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 53,592 psi | 84% | 3278 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,956 psi | 58% | 2940 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 2014 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,534 psi | 54% | 2956 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 43,062 psi | 67% | 3140 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 47,645 psi | 75% | 3140 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 46,340 psi | 73% | 3146 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,992 psi | 72% | 3143 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 48,834 psi | 77% | 3127 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 52,272 psi | 82% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,905 psi | 74% | 3123 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 80% | 40,973 psi | 64% | 2979 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 46,151 psi | 72% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,266 psi | 71% | 3173 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 40,335 psi | 63% | 3028 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 44,048 psi | 69% | 3156 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 52,127 psi | 82% | 3369 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,798 psi | 62% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,221 psi | 68% | 3038 fps | 97.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 62 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | RWS Kegelspitz. ADI AR 2218 delivers the highest muzzle velocity at 3,458 fps; across all powders the maximum-charge window runs from 2,192 fps to 3,458 fps. Accurate 8700 gives the best case fill at 100 %, and 62 of the 62 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 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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.