Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Nosler Custom Competition bullet and 50 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>> | 86% | 55,405 psi | 87% | 3114 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,334 psi | 90% | 3281 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 54,476 psi | 85% | 3222 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 56,434 psi | 88% | 3205 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,071 psi | 86% | 3219 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 54,128 psi | 85% | 3196 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,563 psi | 86% | 3310 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 98% | 57,159 psi | 90% | 3281 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,999 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,622 psi | 87% | 3215 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,493 psi | 90% | 3176 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,230 psi | 85% | 3192 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,360 psi | 85% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,492 psi | 89% | 3291 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3278 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,622 psi | 87% | 3176 fps | 98.1% |
| Bofors RP15 | <<locked>> | 88% | 54,998 psi | 86% | 3202 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,215 psi | 85% | 3209 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,622 psi | 87% | 3215 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,521 psi | 87% | 3219 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,012 psi | 85% | 3146 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,753 psi | 89% | 3192 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,681 psi | 89% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,363 psi | 90% | 3350 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 59% | 2077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,389 psi | 85% | 3127 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 57,363 psi | 90% | 3264 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,101 psi | 88% | 3258 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 57,217 psi | 90% | 3140 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3284 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,724 psi | 87% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,694 psi | 86% | 3225 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 57,464 psi | 90% | 3212 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 61% | 2126 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,230 psi | 85% | 3268 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,679 psi | 84% | 3228 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 56,898 psi | 89% | 3173 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,854 psi | 88% | 3186 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,463 psi | 87% | 3179 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,491 psi | 85% | 3097 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,202 psi | 88% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,217 psi | 88% | 3136 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,463 psi | 87% | 3156 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 55,521 psi | 87% | 3150 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,085 psi | 86% | 3232 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 56,376 psi | 88% | 3225 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 54,143 psi | 85% | 3232 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,419 psi | 87% | 3301 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,041 psi | 85% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,927 psi | 88% | 3146 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,179 psi | 71% | 2933 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,777 psi | 78% | 3143 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 47,166 psi | 74% | 3081 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,211 psi | 77% | 3077 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 44,498 psi | 70% | 3015 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 35,578 psi | 56% | 2795 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 94% | 47,108 psi | 74% | 3153 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 30,516 psi | 48% | 2690 fps | 96.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,081 psi | 77% | 3068 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,281 psi | 71% | 3018 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,106 psi | 69% | 2953 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,203 psi | 60% | 2887 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,357 psi | 79% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,034 psi | 71% | 3068 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,559 psi | 76% | 3130 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,600 psi | 71% | 2979 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,105 psi | 66% | 2949 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 35,694 psi | 56% | 2808 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,281 psi | 71% | 3018 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 36,071 psi | 57% | 2812 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,021 psi | 74% | 3012 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,180 psi | 72% | 2999 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,156 psi | 83% | 3051 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,318 psi | 58% | 2933 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1860 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,776 psi | 75% | 3002 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 43,265 psi | 68% | 2995 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,693 psi | 54% | 2799 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 39,001 psi | 61% | 2805 fps | 99.5% |
| Norma 217 | <<locked>> | 82% | 30,385 psi | 48% | 2694 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 48,269 psi | 76% | 3100 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,613 psi | 68% | 3012 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 80% | 39,349 psi | 62% | 2874 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1903 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,825 psi | 58% | 2904 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,523 psi | 62% | 2930 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 49,966 psi | 78% | 3051 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 48,762 psi | 76% | 3058 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,414 psi | 76% | 3051 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 51,010 psi | 80% | 3035 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 49,182 psi | 77% | 3031 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,033 psi | 67% | 2897 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 51,837 psi | 81% | 3091 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 48,834 psi | 77% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,834 psi | 75% | 3094 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 39,885 psi | 63% | 2894 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 40,524 psi | 64% | 2946 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 90% | 47,877 psi | 75% | 3146 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,888 psi | 67% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,440 psi | 71% | 2956 fps | 99.1% |
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 | 168gr | Nosler Custom Competition. Hodgdon Retumbo delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,350 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 168.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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.