Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Speer TBBC 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% | 54,404 psi | 85% | 3120 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,057 psi | 88% | 3281 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 86% | 57,159 psi | 90% | 3291 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 55,390 psi | 87% | 3209 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 53,853 psi | 84% | 3222 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,623 psi | 89% | 3258 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3389 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 55,767 psi | 87% | 3281 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,027 psi | 86% | 3199 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,433 psi | 85% | 3215 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,188 psi | 88% | 3179 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,768 psi | 89% | 3258 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,043 psi | 89% | 3274 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,969 psi | 86% | 3287 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 3271 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,636 psi | 86% | 3179 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 57,566 psi | 90% | 3271 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,579 psi | 89% | 3271 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,433 psi | 85% | 3215 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 54,230 psi | 85% | 3222 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,594 psi | 89% | 3212 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,622 psi | 87% | 3196 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,651 psi | 87% | 3114 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,883 psi | 88% | 3350 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 59% | 2090 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,464 psi | 90% | 3182 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,913 psi | 89% | 3189 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 56,246 psi | 88% | 3271 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,752 psi | 86% | 3258 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,202 psi | 88% | 3146 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3281 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,447 psi | 85% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,551 psi | 90% | 3294 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 56,159 psi | 88% | 3215 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 61% | 2136 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,985 psi | 89% | 3337 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,362 psi | 88% | 3297 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 55,782 psi | 87% | 3176 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 54,824 psi | 86% | 3192 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,447 psi | 85% | 3186 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,334 psi | 90% | 3166 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 55,085 psi | 86% | 3156 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,085 psi | 86% | 3140 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,404 psi | 85% | 3156 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 54,433 psi | 85% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 53,853 psi | 84% | 3232 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 55,114 psi | 86% | 3228 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,811 psi | 89% | 3304 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 54,099 psi | 85% | 3294 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,695 psi | 89% | 3274 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,940 psi | 86% | 3150 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,266 psi | 69% | 2940 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 48,747 psi | 76% | 3143 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 46,180 psi | 72% | 3081 fps | 97.3% |
| ADI AR 2209 | <<locked>> | 80% | 48,283 psi | 76% | 3081 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 43,555 psi | 68% | 3015 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 34,824 psi | 55% | 2792 fps | 95% |
| ADI AR 2218 | <<locked>> | 94% | 45,890 psi | 72% | 3143 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 29,834 psi | 47% | 2684 fps | 95.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,167 psi | 75% | 3071 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,338 psi | 69% | 3022 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,134 psi | 68% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,304 psi | 58% | 2884 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,211 psi | 77% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,268 psi | 74% | 3133 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,137 psi | 74% | 3120 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,889 psi | 70% | 2982 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 41,321 psi | 65% | 2949 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 34,824 psi | 55% | 2805 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 44,338 psi | 69% | 3022 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 35,302 psi | 55% | 2808 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 46,137 psi | 72% | 3015 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,310 psi | 71% | 2999 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,141 psi | 82% | 3061 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,448 psi | 57% | 2927 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1873 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,824 psi | 84% | 3123 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,963 psi | 74% | 3005 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 42,293 psi | 66% | 2995 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,129 psi | 57% | 2858 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 38,174 psi | 60% | 2805 fps | 99.2% |
| Norma 217 | <<locked>> | 84% | 31,720 psi | 50% | 2753 fps | 96% |
| Norma MRP | <<locked>> | 80% | 47,268 psi | 74% | 3100 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 42,540 psi | 67% | 3009 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 38,406 psi | 60% | 2874 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,066 psi | 46% | 1916 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,853 psi | 56% | 2900 fps | 98.5% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,408 psi | 65% | 2995 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,081 psi | 77% | 3054 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 47,805 psi | 75% | 3061 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,471 psi | 74% | 3058 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 50,198 psi | 79% | 3041 fps | 98.5% |
| Somchem S385 | <<locked>> | 80% | 48,283 psi | 76% | 3035 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,192 psi | 66% | 2897 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 50,749 psi | 80% | 3087 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 47,819 psi | 75% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,862 psi | 73% | 3094 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 38,986 psi | 61% | 2894 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 42,453 psi | 67% | 3015 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 90% | 46,644 psi | 73% | 3146 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,684 psi | 65% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,556 psi | 70% | 2959 fps | 98.8% |
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 | 165gr | Speer TBBC. ADI AR 2218 delivers the highest muzzle velocity at 3,389 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,389 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 165.0 gr projectile in 0.308" calls for a 1:13.5 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.