Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Frontier BTSP bullet and 56 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% | 56,579 psi | 89% | 3156 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,534 psi | 85% | 3258 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 55,376 psi | 87% | 3261 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 57,609 psi | 90% | 3248 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,101 psi | 88% | 3261 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 54,940 psi | 86% | 3235 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,506 psi | 87% | 3350 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3317 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,696 psi | 90% | 3235 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,174 psi | 90% | 3235 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,565 psi | 89% | 3255 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,621 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,897 psi | 86% | 3235 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,259 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,116 psi | 90% | 3327 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 3235 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,811 psi | 89% | 3215 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 55,956 psi | 88% | 3245 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 54,795 psi | 86% | 3248 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 56,565 psi | 89% | 3255 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,391 psi | 88% | 3255 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,230 psi | 87% | 3189 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,230 psi | 85% | 3169 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,186 psi | 85% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 53,911 psi | 84% | 3323 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,159 psi | 88% | 3163 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,898 psi | 89% | 3166 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,622 psi | 87% | 3166 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 54,520 psi | 85% | 3241 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,736 psi | 83% | 3225 fps | 99.5% |
| Lovex S071 | <<locked>> | 92% | 54,534 psi | 85% | 3123 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,566 psi | 90% | 3225 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3255 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,782 psi | 89% | 3274 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,593 psi | 87% | 3264 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 57,595 psi | 90% | 3222 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,244 psi | 85% | 3186 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,566 psi | 60% | 2126 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,723 psi | 86% | 3307 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,215 psi | 85% | 3264 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 54,505 psi | 85% | 3153 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 56,971 psi | 89% | 3228 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,579 psi | 89% | 3222 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,999 psi | 88% | 3143 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 56,260 psi | 88% | 3159 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,392 psi | 90% | 3192 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,377 psi | 90% | 3176 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,536 psi | 89% | 3192 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 86% | 56,579 psi | 89% | 3192 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,188 psi | 88% | 3274 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 57,246 psi | 90% | 3268 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 54,853 psi | 86% | 3271 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 55,956 psi | 88% | 3333 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,520 psi | 85% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,348 psi | 90% | 3192 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,105 psi | 68% | 2917 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 47,210 psi | 74% | 3117 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 80% | 44,759 psi | 70% | 3051 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 47,079 psi | 74% | 3058 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 42,409 psi | 66% | 2992 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 36,187 psi | 57% | 2831 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 47,674 psi | 75% | 3182 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 28,979 psi | 45% | 2661 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,114 psi | 85% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,007 psi | 74% | 3051 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,163 psi | 68% | 2999 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,858 psi | 66% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,172 psi | 57% | 2861 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,442 psi | 74% | 3117 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,469 psi | 71% | 3100 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 48,805 psi | 76% | 3159 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,746 psi | 73% | 3022 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 40,059 psi | 63% | 2923 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 36,172 psi | 57% | 2848 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 43,163 psi | 68% | 2999 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 34,330 psi | 54% | 2782 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 44,904 psi | 70% | 2989 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,208 psi | 69% | 2976 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,836 psi | 80% | 3041 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,375 psi | 55% | 2900 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,692 psi | 83% | 3104 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,272 psi | 83% | 3107 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,948 psi | 72% | 2982 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 41,104 psi | 64% | 2969 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,376 psi | 59% | 2897 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 37,115 psi | 58% | 2782 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 53,737 psi | 84% | 3159 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 30,545 psi | 48% | 2726 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 45,759 psi | 72% | 3074 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 41,191 psi | 65% | 2979 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 53,838 psi | 84% | 3163 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,072 psi | 58% | 2844 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 1906 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,621 psi | 54% | 2867 fps | 98% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 39,871 psi | 62% | 2966 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 47,819 psi | 75% | 3028 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 46,557 psi | 73% | 3038 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,267 psi | 73% | 3035 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 48,994 psi | 77% | 3018 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 52,591 psi | 82% | 3104 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,123 psi | 74% | 3015 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 41,133 psi | 64% | 2877 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 92% | 52,837 psi | 83% | 3127 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 46,499 psi | 73% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,426 psi | 71% | 3064 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 37,797 psi | 59% | 2867 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 41,046 psi | 64% | 2986 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 92% | 48,414 psi | 76% | 3186 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,089 psi | 63% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,352 psi | 68% | 2933 fps | 98.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 63 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Frontier BTSP. ADI AR 2218 delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,350 fps. Accurate 8700 gives the best case fill at 100 %, and 63 of the 63 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 165.0 gr projectile in 0.308" calls for a 1:10.5 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.