Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 175gr | Barnes LRX BT 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% | 56,594 psi | 89% | 3081 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,810 psi | 86% | 3189 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 86% | 55,767 psi | 87% | 3192 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 54,317 psi | 85% | 3117 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,623 psi | 89% | 3192 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 55,405 psi | 87% | 3169 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3291 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 54,288 psi | 85% | 3189 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 54,491 psi | 85% | 3114 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,624 psi | 90% | 3166 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,913 psi | 89% | 3186 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,056 psi | 86% | 3091 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,434 psi | 87% | 3166 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,593 psi | 87% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,711 psi | 90% | 3268 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 3173 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,246 psi | 90% | 3153 fps | 98.5% |
| Bofors RP15 | <<locked>> | 90% | 56,275 psi | 88% | 3176 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,230 psi | 87% | 3182 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 56,913 psi | 89% | 3186 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,101 psi | 89% | 3192 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,579 psi | 87% | 3120 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,534 psi | 85% | 3104 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,563 psi | 86% | 3022 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,578 psi | 86% | 3255 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 2018 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,608 psi | 89% | 3094 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,246 psi | 90% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,043 psi | 88% | 3104 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 54,998 psi | 86% | 3176 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,113 psi | 83% | 3159 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 54,665 psi | 86% | 3051 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,145 psi | 90% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,217 psi | 88% | 3199 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 54,592 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 2067 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,434 psi | 87% | 3238 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,723 psi | 86% | 3202 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 54,839 psi | 86% | 3084 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 57,377 psi | 90% | 3159 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,985 psi | 89% | 3153 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,260 psi | 88% | 3077 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 56,666 psi | 89% | 3084 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,566 psi | 90% | 3120 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,740 psi | 90% | 3110 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,811 psi | 89% | 3130 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 86% | 56,782 psi | 89% | 3120 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,594 psi | 89% | 3209 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 57,421 psi | 90% | 3196 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 94% | 55,303 psi | 87% | 3205 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 96% | 56,579 psi | 89% | 3274 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,027 psi | 86% | 3176 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,696 psi | 90% | 3123 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% | 43,004 psi | 67% | 2848 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 47,572 psi | 75% | 3054 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 44,947 psi | 70% | 2986 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 47,427 psi | 74% | 2992 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 42,569 psi | 67% | 2927 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 33,823 psi | 53% | 2707 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 44,672 psi | 70% | 3051 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 28,747 psi | 45% | 2598 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,776 psi | 75% | 2992 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,297 psi | 74% | 2986 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,236 psi | 68% | 2930 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,018 psi | 66% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,274 psi | 57% | 2799 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,703 psi | 75% | 3045 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,759 psi | 72% | 3041 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,266 psi | 71% | 3022 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,990 psi | 69% | 2897 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 40,190 psi | 63% | 2861 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 33,707 psi | 53% | 2717 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 43,236 psi | 68% | 2930 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 34,301 psi | 54% | 2723 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 45,208 psi | 71% | 2930 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,353 psi | 70% | 2910 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,068 psi | 80% | 2969 fps | 100% |
| Hodgdon Retumbo | 87.9 gr | 80% | 35,346 psi | 55% | 2835 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 44% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,040 psi | 83% | 3035 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,534 psi | 84% | 3035 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,166 psi | 72% | 2920 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 41,263 psi | 65% | 2904 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,853 psi | 55% | 2769 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 36,840 psi | 58% | 2710 fps | 99.2% |
| Norma 217 | <<locked>> | 84% | 30,385 psi | 48% | 2661 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 46,093 psi | 72% | 3009 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 41,408 psi | 65% | 2920 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 80% | 37,159 psi | 58% | 2782 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 1850 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,650 psi | 54% | 2808 fps | 98.5% |
| ReloadSwiss RS 80 | 102 gr | 86% | 40,016 psi | 63% | 2904 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 48,080 psi | 75% | 2963 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,804 psi | 73% | 2972 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,485 psi | 73% | 2966 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 49,182 psi | 77% | 2953 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 52,910 psi | 83% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,137 psi | 74% | 2946 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,234 psi | 65% | 2815 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 49,574 psi | 78% | 2999 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 46,398 psi | 73% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,774 psi | 72% | 3005 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 37,666 psi | 59% | 2799 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 41,147 psi | 64% | 2923 fps | 95.9% |
| Vihtavuori N570 | 102.7 gr | 90% | 45,368 psi | 71% | 3051 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,292 psi | 63% | 2923 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,410 psi | 68% | 2867 fps | 98.9% |
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 | 175gr | Barnes LRX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,291 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,291 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 175.0 gr projectile in 0.308" calls for a 1:10.5 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 | 175gr | Barnes LRX 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.