Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Barnes TAC-TX BT bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 55,434 psi | 87% | 3117 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,505 psi | 85% | 3225 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 86% | 56,927 psi | 89% | 3215 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,405 psi | 87% | 3228 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 54,070 psi | 85% | 3199 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 3314 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3281 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,116 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,594 psi | 89% | 3202 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,753 psi | 87% | 3222 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,508 psi | 90% | 3179 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,056 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,244 psi | 85% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,115 psi | 88% | 3291 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3192 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,289 psi | 88% | 3186 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 55,129 psi | 86% | 3209 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 57,711 psi | 90% | 3271 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 55,753 psi | 87% | 3222 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,666 psi | 87% | 3222 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,520 psi | 85% | 3156 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,290 psi | 90% | 3202 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,072 psi | 89% | 3114 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,058 psi | 89% | 3353 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 59% | 2057 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,593 psi | 87% | 3130 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,115 psi | 88% | 3133 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,955 psi | 86% | 3133 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 57,725 psi | 90% | 3274 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,822 psi | 81% | 3189 fps | 99.5% |
| Lovex S070 | <<locked>> | 82% | 57,638 psi | 90% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,000 psi | 89% | 3140 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,855 psi | 89% | 3192 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3215 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,898 psi | 88% | 3238 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,725 psi | 90% | 3176 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,810 psi | 86% | 3232 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 56,797 psi | 89% | 3186 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,595 psi | 90% | 3219 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 60% | 2106 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,911 psi | 84% | 3271 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,435 psi | 90% | 3297 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 57,479 psi | 90% | 3182 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 56,130 psi | 88% | 3192 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,638 psi | 90% | 3163 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,738 psi | 87% | 3186 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,274 psi | 87% | 3110 fps | 99.2% |
| Somchem S365 | <<locked>> | 82% | 55,477 psi | 87% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,492 psi | 89% | 3156 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,579 psi | 89% | 3146 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,709 psi | 87% | 3159 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 86% | 55,477 psi | 87% | 3153 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,390 psi | 87% | 3241 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 56,101 psi | 88% | 3225 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 53,795 psi | 84% | 3232 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 55,129 psi | 86% | 3297 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,519 psi | 84% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,536 psi | 89% | 3156 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% | 41,872 psi | 66% | 2874 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 43,830 psi | 69% | 3012 fps | 96.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,427 psi | 73% | 3025 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 41,582 psi | 65% | 2953 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 84% | 35,331 psi | 55% | 2792 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 96% | 46,949 psi | 74% | 3150 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 30,052 psi | 47% | 2680 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,301 psi | 84% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,209 psi | 72% | 3015 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,235 psi | 66% | 2956 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,886 psi | 64% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,360 psi | 55% | 2822 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,557 psi | 73% | 3077 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,008 psi | 75% | 3136 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,529 psi | 74% | 3114 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,151 psi | 72% | 2992 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,233 psi | 61% | 2887 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 35,143 psi | 55% | 2802 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 42,235 psi | 66% | 2956 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 33,475 psi | 52% | 2743 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 44,251 psi | 69% | 2956 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,410 psi | 68% | 2940 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,096 psi | 79% | 3009 fps | 100% |
| Hodgdon Retumbo | 88.6 gr | 80% | 34,432 psi | 54% | 2854 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1844 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,112 psi | 82% | 3071 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,489 psi | 82% | 3074 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,310 psi | 71% | 2949 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 40,263 psi | 63% | 2930 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,347 psi | 57% | 2851 fps | 95.7% |
| Lovex S070 | <<locked>> | 80% | 54,012 psi | 85% | 3100 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,998 psi | 56% | 2740 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 52,997 psi | 83% | 3127 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 31,720 psi | 50% | 2743 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 44,933 psi | 70% | 3038 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 54,027 psi | 85% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,292 psi | 63% | 2943 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 80% | 53,040 psi | 83% | 3127 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,085 psi | 57% | 2802 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1890 fps | 100% |
| ReloadSwiss RS 76 | 94.9 gr | 80% | 33,765 psi | 53% | 2825 fps | 97.8% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 38,841 psi | 61% | 2923 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 47,195 psi | 74% | 2995 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 45,818 psi | 72% | 3002 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 54,012 psi | 85% | 3100 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,469 psi | 71% | 2999 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 48,182 psi | 76% | 2982 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 51,750 psi | 81% | 3068 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,166 psi | 72% | 2976 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 40,219 psi | 63% | 2838 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 92% | 51,967 psi | 81% | 3091 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 45,339 psi | 71% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,686 psi | 70% | 3031 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 80% | 36,724 psi | 58% | 2822 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 86% | 40,074 psi | 63% | 2943 fps | 95% |
| Vihtavuori N570 | 105.8 gr | 92% | 47,500 psi | 74% | 3146 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,986 psi | 61% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,598 psi | 67% | 2900 fps | 98.5% |
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 58 powders for .30-378 Weath. Mag. loaded with the .308 | 168gr | Barnes TAC-TX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,353 fps; across all powders the maximum-charge window runs from 2,057 fps to 3,353 fps. ADI AR 2218 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 168.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 168gr | Barnes TAC-TX BT 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.