Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Barnes TSX BT bullet and 65 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>> | 90% | 56,347 psi | 88% | 3278 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,637 psi | 89% | 3310 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,447 psi | 85% | 3379 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 88% | 55,521 psi | 87% | 3383 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 54,215 psi | 85% | 3317 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 90% | 56,434 psi | 88% | 3392 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 54,839 psi | 86% | 3350 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 3369 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,288 psi | 85% | 3317 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,551 psi | 90% | 3369 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,710 psi | 89% | 3386 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,578 psi | 86% | 3291 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,650 psi | 86% | 3356 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,172 psi | 86% | 3376 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 3442 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,435 psi | 90% | 3343 fps | 97.4% |
| Bofors RP15 | <<locked>> | 92% | 55,854 psi | 88% | 3366 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 54,462 psi | 85% | 3360 fps | 99.4% |
| Bofors RP5 | <<locked>> | 90% | 56,710 psi | 89% | 3386 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 56,463 psi | 88% | 3379 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 55,753 psi | 87% | 3320 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,563 psi | 86% | 3297 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,462 psi | 85% | 3228 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,682 psi | 90% | 3514 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 59% | 2175 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,768 psi | 89% | 3297 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,174 psi | 90% | 3301 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,231 psi | 88% | 3301 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 54,534 psi | 85% | 3363 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,660 psi | 76% | 3264 fps | 98.4% |
| Lovex S065 | <<locked>> | 82% | 56,695 psi | 89% | 3274 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,114 psi | 86% | 3271 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,157 psi | 85% | 3241 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,302 psi | 85% | 3294 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3291 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 56,855 psi | 89% | 3402 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,998 psi | 86% | 3291 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,666 psi | 87% | 3389 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 54,215 psi | 85% | 3294 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,215 psi | 85% | 3307 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 60% | 2224 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,188 psi | 90% | 3333 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,912 psi | 88% | 3363 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,563 psi | 86% | 3428 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,969 psi | 85% | 3376 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 54,998 psi | 86% | 3284 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 88% | 57,261 psi | 90% | 3356 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,695 psi | 89% | 3274 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,114 psi | 86% | 3271 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,724 psi | 87% | 3219 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,855 psi | 89% | 3356 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 56,565 psi | 89% | 3271 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 56,333 psi | 88% | 3294 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,566 psi | 90% | 3323 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,594 psi | 89% | 3281 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,653 psi | 90% | 3307 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 55,825 psi | 87% | 3281 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,318 psi | 88% | 3317 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,391 psi | 88% | 3402 fps | 99% |
| Vihtavuori N565 | <<locked>> | 94% | 56,956 psi | 89% | 3383 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 54,563 psi | 86% | 3379 fps | 98% |
| Vihtavuori N570 | <<locked>> | 98% | 55,767 psi | 87% | 3448 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,391 psi | 88% | 3222 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 53,896 psi | 84% | 3373 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,696 psi | 90% | 3320 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,711 psi | 62% | 2956 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 52,866 psi | 83% | 3245 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,743 psi | 69% | 3156 fps | 96.8% |
| Accurate MAGPRO | <<locked>> | 82% | 44,570 psi | 70% | 3159 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,077 psi | 69% | 3114 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 39,320 psi | 62% | 3028 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 88% | 38,435 psi | 60% | 2995 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 86% | 32,605 psi | 51% | 2874 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,720 psi | 79% | 3255 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,048 psi | 69% | 3104 fps | 97.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,842 psi | 62% | 3035 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,551 psi | 60% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,243 psi | 52% | 2890 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,627 psi | 68% | 3163 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,689 psi | 76% | 3281 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,299 psi | 79% | 3205 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 37,057 psi | 58% | 2959 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 38,189 psi | 60% | 3009 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 39,842 psi | 62% | 3035 fps | 96.8% |
| Hodgdon H1000 | <<locked>> | 84% | 36,506 psi | 57% | 2946 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 41,945 psi | 66% | 3035 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,176 psi | 65% | 3018 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,572 psi | 75% | 3114 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 34,766 psi | 54% | 2986 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 44% | 1949 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,850 psi | 78% | 3176 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 50,009 psi | 78% | 3179 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,308 psi | 68% | 3038 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 82% | 40,828 psi | 64% | 3074 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,218 psi | 61% | 3051 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 53,243 psi | 83% | 3215 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,692 psi | 81% | 3209 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 33,881 psi | 53% | 2808 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 50,546 psi | 79% | 3225 fps | 99% |
| Norma 217 | <<locked>> | 90% | 34,127 psi | 53% | 2933 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 42,293 psi | 66% | 3117 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 51,488 psi | 81% | 3228 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,797 psi | 59% | 3005 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 50,488 psi | 79% | 3228 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,866 psi | 53% | 2867 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 45% | 1995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,214 psi | 83% | 3268 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,880 psi | 81% | 3294 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 31,662 psi | 50% | 2874 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,438 psi | 67% | 3133 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,049 psi | 71% | 3087 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,453 psi | 68% | 3091 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,243 psi | 83% | 3215 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,692 psi | 81% | 3209 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,214 psi | 82% | 3159 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,120 psi | 68% | 3084 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 46,064 psi | 72% | 3068 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 49,023 psi | 77% | 3173 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,801 psi | 69% | 3061 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,011 psi | 83% | 3222 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,218 psi | 60% | 2920 fps | 97% |
| Vihtavuori N550 | <<locked>> | 80% | 52,214 psi | 82% | 3222 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,902 psi | 67% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,163 psi | 66% | 3107 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 39,987 psi | 63% | 3028 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 90% | 43,642 psi | 68% | 3156 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 51,692 psi | 81% | 3366 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,620 psi | 82% | 3166 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,984 psi | 56% | 3022 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,321 psi | 63% | 2979 fps | 97% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 71 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Barnes TSX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,514 fps; across all powders the maximum-charge window runs from 2,175 fps to 3,514 fps. ADI AR 2218 gives the best case fill at 100 %, and 71 of the 71 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 150.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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, Alliant Reloder-50, 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.