Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Barnes TSX BT bullet and 53 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% | 56,347 psi | 88% | 3130 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,564 psi | 87% | 3241 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 54,099 psi | 85% | 3166 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,492 psi | 89% | 3245 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,216 psi | 87% | 3219 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3337 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% | 56,811 psi | 89% | 3238 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,868 psi | 86% | 3140 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,201 psi | 87% | 3215 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,434 psi | 87% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,580 psi | 90% | 3314 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 3215 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,116 psi | 90% | 3202 fps | 98.3% |
| Bofors RP15 | <<locked>> | 90% | 56,159 psi | 88% | 3228 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 54,926 psi | 86% | 3228 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 56,811 psi | 89% | 3238 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,913 psi | 89% | 3245 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,376 psi | 87% | 3173 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,375 psi | 85% | 3156 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,331 psi | 85% | 3074 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,447 psi | 85% | 3304 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2067 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,347 psi | 88% | 3143 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,927 psi | 89% | 3143 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,927 psi | 88% | 3153 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 54,752 psi | 86% | 3225 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,997 psi | 83% | 3209 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 54,476 psi | 85% | 3100 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 3235 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,029 psi | 89% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,985 psi | 88% | 3248 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,725 psi | 90% | 3202 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,404 psi | 85% | 3169 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 60% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,230 psi | 87% | 3287 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,607 psi | 86% | 3248 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 54,665 psi | 86% | 3136 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 57,072 psi | 89% | 3205 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,681 psi | 89% | 3205 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,144 psi | 88% | 3127 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 56,362 psi | 88% | 3136 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,406 psi | 90% | 3173 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,580 psi | 90% | 3163 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,695 psi | 89% | 3176 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 86% | 56,507 psi | 89% | 3169 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,449 psi | 88% | 3261 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 57,261 psi | 90% | 3245 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 55,085 psi | 86% | 3251 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 96% | 56,318 psi | 88% | 3320 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,810 psi | 86% | 3228 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,537 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% | 42,786 psi | 67% | 2890 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 44,701 psi | 70% | 3031 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 47,239 psi | 74% | 3041 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 42,337 psi | 66% | 2969 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 36,071 psi | 57% | 2812 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 47,979 psi | 75% | 3173 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 28,587 psi | 45% | 2631 fps | 95.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,094 psi | 74% | 3031 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,004 psi | 67% | 2976 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,727 psi | 65% | 2913 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,085 psi | 57% | 2838 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,558 psi | 75% | 3094 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,585 psi | 71% | 3084 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 48,863 psi | 77% | 3140 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,888 psi | 69% | 2946 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 39,987 psi | 63% | 2904 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 35,998 psi | 56% | 2825 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,004 psi | 67% | 2976 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 34,098 psi | 53% | 2759 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,947 psi | 70% | 2972 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,121 psi | 69% | 2953 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,778 psi | 80% | 3018 fps | 100% |
| Hodgdon Retumbo | 90 gr | 80% | 35,128 psi | 55% | 2874 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,852 psi | 83% | 3087 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,330 psi | 84% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,992 psi | 72% | 2966 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 41,017 psi | 64% | 2946 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,693 psi | 54% | 2805 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 36,622 psi | 57% | 2753 fps | 99% |
| Norma 217 | <<locked>> | 84% | 30,211 psi | 47% | 2694 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 45,890 psi | 72% | 3054 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 41,220 psi | 65% | 2963 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 53,954 psi | 85% | 3143 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,927 psi | 58% | 2822 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1896 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,519 psi | 54% | 2844 fps | 98.1% |
| ReloadSwiss RS 80 | 104.4 gr | 86% | 39,784 psi | 62% | 2943 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 47,935 psi | 75% | 3012 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 46,601 psi | 73% | 3022 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,267 psi | 73% | 3015 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 48,936 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% | 41,031 psi | 64% | 2858 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 52,953 psi | 83% | 3110 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 46,209 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% | 2841 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 41,017 psi | 64% | 2966 fps | 95.4% |
| Vihtavuori N570 | 107.5 gr | 92% | 48,660 psi | 76% | 3169 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,074 psi | 63% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,308 psi | 68% | 2917 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 60 powders for .30-378 Weath. Mag. loaded with the .308 | 168gr | Barnes TSX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,337 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,337 fps. Accurate 8700 gives the best case fill at 100 %, and 60 of the 60 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. 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. Hodgdon Retumbo, ReloadSwiss RS 80, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 168gr | Barnes TSX BT they combine a high case fill with complete burn and sit in the upper velocity band. 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.