Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Barnes TAC-X bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 80 and Vihtavuori N570.
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% | 56,318 psi | 88% | 3130 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,695 psi | 87% | 3245 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 54,085 psi | 85% | 3169 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,478 psi | 89% | 3248 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,230 psi | 87% | 3219 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,927 psi | 88% | 3340 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 98% | 54,114 psi | 85% | 3238 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,479 psi | 90% | 3219 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,782 psi | 89% | 3238 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,839 psi | 86% | 3140 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,187 psi | 86% | 3215 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,405 psi | 87% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,551 psi | 90% | 3314 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3215 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,087 psi | 89% | 3202 fps | 98.3% |
| Bofors RP15 | <<locked>> | 90% | 56,173 psi | 88% | 3225 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 54,911 psi | 86% | 3225 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 56,782 psi | 89% | 3238 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,884 psi | 89% | 3241 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,521 psi | 87% | 3176 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,346 psi | 85% | 3153 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,331 psi | 85% | 3074 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,447 psi | 85% | 3307 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 2067 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,318 psi | 88% | 3146 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,927 psi | 89% | 3143 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,898 psi | 88% | 3153 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 54,897 psi | 86% | 3225 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,968 psi | 83% | 3209 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 54,447 psi | 85% | 3104 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,740 psi | 90% | 3205 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3235 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,000 psi | 89% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,130 psi | 88% | 3251 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,696 psi | 90% | 3202 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,549 psi | 85% | 3169 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,201 psi | 87% | 3291 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,578 psi | 86% | 3248 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 54,665 psi | 86% | 3136 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 57,261 psi | 90% | 3212 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,869 psi | 89% | 3205 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,115 psi | 88% | 3127 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 56,362 psi | 88% | 3136 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,377 psi | 90% | 3173 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,551 psi | 90% | 3159 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,666 psi | 89% | 3179 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 86% | 56,478 psi | 89% | 3169 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,449 psi | 88% | 3258 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 57,261 psi | 90% | 3245 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 55,100 psi | 86% | 3255 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 96% | 56,478 psi | 89% | 3320 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,781 psi | 86% | 3228 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,551 psi | 90% | 3173 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,757 psi | 67% | 2890 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 44,672 psi | 70% | 3028 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 47,210 psi | 74% | 3041 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 42,322 psi | 66% | 2969 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 36,056 psi | 56% | 2812 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 47,950 psi | 75% | 3173 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 28,660 psi | 45% | 2631 fps | 95.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,108 psi | 74% | 3031 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,989 psi | 67% | 2976 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,713 psi | 65% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,071 psi | 57% | 2838 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,529 psi | 74% | 3094 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,556 psi | 71% | 3081 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 48,863 psi | 77% | 3140 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,874 psi | 69% | 2943 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 39,972 psi | 63% | 2904 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 35,984 psi | 56% | 2822 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 42,989 psi | 67% | 2976 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 34,084 psi | 53% | 2759 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,933 psi | 70% | 2972 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,106 psi | 69% | 2956 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,923 psi | 80% | 3022 fps | 100% |
| Hodgdon Retumbo | 90.1 gr | 80% | 35,230 psi | 55% | 2877 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,837 psi | 83% | 3087 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,301 psi | 84% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,006 psi | 72% | 2966 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 41,147 psi | 64% | 2953 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,708 psi | 54% | 2805 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 36,637 psi | 57% | 2753 fps | 99% |
| Norma 204 | <<locked>> | 80% | 53,867 psi | 84% | 3143 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 30,226 psi | 47% | 2694 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 45,861 psi | 72% | 3054 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 41,205 psi | 65% | 2963 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 53,925 psi | 85% | 3143 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,898 psi | 58% | 2822 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1896 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,505 psi | 54% | 2844 fps | 98.1% |
| ReloadSwiss RS 80 | 104.5 gr | 86% | 39,900 psi | 63% | 2943 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 47,906 psi | 75% | 3012 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 46,615 psi | 73% | 3022 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,282 psi | 73% | 3015 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 48,950 psi | 77% | 2999 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 52,663 psi | 83% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,891 psi | 73% | 2989 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,017 psi | 64% | 2854 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 52,924 psi | 83% | 3110 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 46,180 psi | 72% | 2995 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,571 psi | 71% | 3048 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 37,521 psi | 59% | 2838 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 40,988 psi | 64% | 2963 fps | 95.4% |
| Vihtavuori N570 | 107.5 gr | 92% | 48,646 psi | 76% | 3169 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,059 psi | 63% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,294 psi | 68% | 2913 fps | 98.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 54 powders for .30-378 Weath. Mag. loaded with the .308 | 168gr | Barnes TAC-X. ADI AR 2218 delivers the highest muzzle velocity at 3,340 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,340 fps. ADI AR 2218 gives the best case fill at 100 %, and 54 of the 54 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 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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. Hodgdon Retumbo, ReloadSwiss RS 80, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 168gr | Barnes TAC-X they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.