Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 175gr | Nosler Custom Competition bullet and 51 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 56,652 psi | 89% | 3077 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,080 psi | 75% | 3031 fps | 96.1% |
| Accurate High Country | <<locked>> | 82% | 54,766 psi | 86% | 3186 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 55,854 psi | 88% | 3196 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 57,595 psi | 90% | 3173 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,405 psi | 88% | 3192 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,448 psi | 87% | 3166 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,130 psi | 88% | 3294 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 54,926 psi | 86% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,145 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,927 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,143 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,695 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,854 psi | 88% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,056 psi | 85% | 3199 fps | 98.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 53,940 psi | 85% | 3186 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,695 psi | 89% | 3146 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 56,289 psi | 88% | 3173 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,506 psi | 87% | 3179 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,927 psi | 89% | 3182 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,913 psi | 89% | 3189 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,172 psi | 86% | 3114 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,201 psi | 85% | 3097 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,027 psi | 86% | 3255 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 59% | 2037 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,390 psi | 87% | 3094 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 54,839 psi | 86% | 3169 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,638 psi | 90% | 3232 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,056 psi | 86% | 3054 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,158 psi | 86% | 3192 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,116 psi | 90% | 3199 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,231 psi | 88% | 3196 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,679 psi | 86% | 3117 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,841 psi | 61% | 2083 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,840 psi | 88% | 3238 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,216 psi | 87% | 3205 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 54,259 psi | 85% | 3077 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 57,029 psi | 89% | 3153 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 3045 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,652 psi | 89% | 3146 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,579 psi | 87% | 3068 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 57,421 psi | 90% | 3117 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,464 psi | 90% | 3104 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,855 psi | 89% | 3133 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 56,898 psi | 89% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,420 psi | 88% | 3202 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 57,638 psi | 90% | 3196 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 55,535 psi | 87% | 3205 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 56,971 psi | 89% | 3274 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,695 psi | 87% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,174 psi | 90% | 3114 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,354 psi | 73% | 2907 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,599 psi | 70% | 2956 fps | 95% |
| Accurate High Country | <<locked>> | 80% | 50,981 psi | 80% | 3114 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 48,356 psi | 76% | 3054 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 50,401 psi | 79% | 3048 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 45,672 psi | 72% | 2989 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 80% | 34,055 psi | 53% | 2710 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 92% | 44,831 psi | 70% | 3054 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 31,415 psi | 49% | 2680 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,212 psi | 79% | 3038 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,485 psi | 73% | 2995 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,165 psi | 71% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,378 psi | 62% | 2864 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,750 psi | 81% | 3107 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,076 psi | 68% | 2976 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,412 psi | 73% | 3038 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,569 psi | 68% | 2890 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 43,221 psi | 68% | 2927 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 36,782 psi | 58% | 2795 fps | 96.7% |
| Bofors RP5 | <<locked>> | 80% | 46,485 psi | 73% | 2995 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 37,101 psi | 58% | 2795 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 48,167 psi | 75% | 2989 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,297 psi | 74% | 2969 fps | 98.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 38,479 psi | 60% | 2917 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 45% | 1824 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,776 psi | 76% | 2972 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 44,454 psi | 70% | 2972 fps | 98.5% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,359 psi | 52% | 2720 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 40,016 psi | 63% | 2779 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 29,196 psi | 46% | 2615 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 49,501 psi | 78% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,976 psi | 70% | 2989 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 80% | 40,466 psi | 63% | 2851 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,196 psi | 46% | 1867 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,956 psi | 59% | 2887 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,724 psi | 59% | 2841 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 50,908 psi | 80% | 3018 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 49,937 psi | 78% | 3031 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,760 psi | 73% | 2979 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,588 psi | 78% | 3025 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 52,054 psi | 82% | 3005 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 50,343 psi | 79% | 3002 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,121 psi | 69% | 2871 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 49,559 psi | 78% | 2999 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 49,893 psi | 78% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,008 psi | 77% | 3068 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 41,017 psi | 64% | 2874 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 82% | 38,754 psi | 61% | 2858 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 88% | 45,876 psi | 72% | 3058 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,440 psi | 70% | 2992 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,557 psi | 73% | 2930 fps | 99.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 175gr | Nosler Custom Competition. ADI AR 2218 delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 2,037 fps to 3,294 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 175.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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, Hodgdon US 869, Lovex D100, Ramshot LRT 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.