Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Speer Boat-Tail 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 57,609 psi | 90% | 3058 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,124 psi | 77% | 3018 fps | 96.7% |
| Accurate High Country | <<locked>> | 82% | 55,753 psi | 87% | 3166 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 56,739 psi | 89% | 3176 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,810 psi | 86% | 3091 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,406 psi | 90% | 3169 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,594 psi | 89% | 3150 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,203 psi | 90% | 3284 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 96% | 56,028 psi | 88% | 3173 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,476 psi | 85% | 3077 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,157 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,101 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,811 psi | 89% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,811 psi | 89% | 3150 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,172 psi | 86% | 3186 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,274 psi | 87% | 3176 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,551 psi | 90% | 3127 fps | 98.9% |
| Bofors RP15 | <<locked>> | 88% | 57,276 psi | 90% | 3153 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,623 psi | 89% | 3163 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,157 psi | 85% | 3104 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,012 psi | 85% | 3107 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,057 psi | 88% | 3094 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,056 psi | 86% | 3077 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,275 psi | 88% | 3238 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2011 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,159 psi | 88% | 3071 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 55,854 psi | 88% | 3153 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,100 psi | 86% | 3156 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,985 psi | 88% | 3035 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,478 psi | 89% | 3176 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,157 psi | 85% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,392 psi | 90% | 3176 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,825 psi | 87% | 3097 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 61% | 2057 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,232 psi | 90% | 3222 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,304 psi | 88% | 3189 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 55,216 psi | 87% | 3058 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,317 psi | 85% | 3071 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,082 psi | 80% | 3031 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,609 psi | 90% | 3127 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,405 psi | 88% | 3048 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,592 psi | 86% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,650 psi | 86% | 3025 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,725 psi | 90% | 3114 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 82% | 54,288 psi | 85% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,435 psi | 90% | 3186 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 54,926 psi | 86% | 3117 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 56,753 psi | 89% | 3192 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 54,143 psi | 85% | 3192 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,014 psi | 89% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,273 psi | 85% | 3035 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,137 psi | 74% | 2887 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,542 psi | 71% | 2946 fps | 95.7% |
| Accurate High Country | <<locked>> | 80% | 52,069 psi | 82% | 3100 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,255 psi | 77% | 3038 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 51,184 psi | 80% | 3028 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,528 psi | 73% | 2972 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 34,679 psi | 54% | 2700 fps | 96.2% |
| ADI AR 2218 | <<locked>> | 90% | 42,598 psi | 67% | 2972 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 32,068 psi | 50% | 2671 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,024 psi | 80% | 3018 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,282 psi | 74% | 2976 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,948 psi | 72% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,190 psi | 63% | 2848 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,794 psi | 83% | 3087 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,976 psi | 69% | 2966 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,092 psi | 69% | 2956 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,251 psi | 69% | 2877 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 43,961 psi | 69% | 2907 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,565 psi | 59% | 2782 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 47,282 psi | 74% | 2976 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,797 psi | 59% | 2782 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 80% | 48,921 psi | 77% | 2969 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,051 psi | 75% | 2953 fps | 98.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,276 psi | 62% | 2904 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1801 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,487 psi | 78% | 2953 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 45,310 psi | 71% | 2956 fps | 98.8% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,113 psi | 53% | 2710 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 40,698 psi | 64% | 2762 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,907 psi | 47% | 2608 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 50,575 psi | 79% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,934 psi | 72% | 2976 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 41,321 psi | 65% | 2838 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1844 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,812 psi | 61% | 2881 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,624 psi | 61% | 2831 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 51,648 psi | 81% | 2999 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,763 psi | 80% | 3009 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,688 psi | 75% | 2966 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,430 psi | 79% | 3005 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,823 psi | 83% | 2986 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 51,111 psi | 80% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,831 psi | 70% | 2854 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,108 psi | 74% | 2920 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 50,763 psi | 80% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,024 psi | 78% | 3051 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 41,829 psi | 66% | 2861 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 39,610 psi | 62% | 2851 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 86% | 43,569 psi | 68% | 2972 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,498 psi | 71% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,355 psi | 74% | 2913 fps | 99.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Speer Boat-Tail. ADI AR 2218 delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,284 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 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 50BMG, Hodgdon US 869, 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.