Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 171gr | Peregrine VRG-2 bullet and 50 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>> | 86% | 54,969 psi | 86% | 3087 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,159 psi | 90% | 3258 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 54,259 psi | 85% | 3196 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 56,405 psi | 88% | 3186 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,042 psi | 86% | 3202 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 54,027 psi | 85% | 3176 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,534 psi | 85% | 3294 fps | 98.3% |
| ADI AR 2225 | <<locked>> | 98% | 57,261 psi | 90% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,941 psi | 88% | 3173 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,463 psi | 87% | 3192 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,348 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,128 psi | 85% | 3173 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,099 psi | 85% | 3179 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,536 psi | 89% | 3271 fps | 98.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,202 psi | 88% | 3258 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,608 psi | 87% | 3159 fps | 98.3% |
| Bofors RP15 | <<locked>> | 88% | 54,853 psi | 86% | 3182 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 53,954 psi | 85% | 3186 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,463 psi | 87% | 3192 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,477 psi | 87% | 3199 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,711 psi | 90% | 3189 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,695 psi | 89% | 3176 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,449 psi | 88% | 3084 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,566 psi | 90% | 3330 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 59% | 2060 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,302 psi | 85% | 3107 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 57,334 psi | 90% | 3245 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3235 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 56,797 psi | 89% | 3117 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3258 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,521 psi | 87% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,592 psi | 86% | 3202 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 57,290 psi | 90% | 3189 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 61% | 2110 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,259 psi | 85% | 3245 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,461 psi | 84% | 3202 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 56,681 psi | 89% | 3153 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,724 psi | 87% | 3163 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,347 psi | 87% | 3159 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,331 psi | 85% | 3077 fps | 99.4% |
| Somchem S385 | <<locked>> | 84% | 55,811 psi | 87% | 3127 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,072 psi | 88% | 3117 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,303 psi | 87% | 3136 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 84% | 55,187 psi | 86% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,955 psi | 86% | 3209 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 55,999 psi | 88% | 3202 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 54,027 psi | 85% | 3212 fps | 99% |
| Vihtavuori N570 | <<locked>> | 94% | 55,361 psi | 87% | 3278 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,853 psi | 84% | 3182 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,941 psi | 88% | 3127 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,657 psi | 70% | 2907 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,530 psi | 78% | 3120 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 80% | 46,891 psi | 73% | 3054 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 49,153 psi | 77% | 3058 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 44,353 psi | 70% | 2992 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 35,259 psi | 55% | 2772 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 94% | 46,804 psi | 73% | 3130 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,081 psi | 47% | 2661 fps | 96.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,965 psi | 77% | 3048 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,034 psi | 71% | 2995 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,743 psi | 69% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,956 psi | 59% | 2861 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,053 psi | 78% | 3114 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,802 psi | 70% | 3041 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,080 psi | 75% | 3097 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,598 psi | 67% | 2897 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 41,829 psi | 66% | 2927 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 35,288 psi | 55% | 2782 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,034 psi | 71% | 2995 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 35,795 psi | 56% | 2789 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 46,862 psi | 73% | 2992 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,035 psi | 72% | 2976 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,881 psi | 83% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,057 psi | 58% | 2907 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,282 psi | 44% | 1847 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,674 psi | 75% | 2982 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 43,091 psi | 68% | 2972 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,127 psi | 53% | 2766 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 38,334 psi | 60% | 2772 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 29,849 psi | 47% | 2657 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 48,037 psi | 75% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,424 psi | 68% | 2989 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 80% | 39,001 psi | 61% | 2848 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 45% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,448 psi | 57% | 2877 fps | 99% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,088 psi | 61% | 2900 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 49,734 psi | 78% | 3028 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 48,588 psi | 76% | 3035 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,240 psi | 76% | 3031 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 50,821 psi | 80% | 3015 fps | 98.9% |
| Somchem S385 | <<locked>> | 80% | 48,892 psi | 77% | 3009 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,772 psi | 67% | 2874 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 51,590 psi | 81% | 3071 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 48,283 psi | 76% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,645 psi | 75% | 3071 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 80% | 39,407 psi | 62% | 2864 fps | 96.6% |
| Vihtavuori N568 | <<locked>> | 84% | 40,147 psi | 63% | 2920 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 90% | 47,761 psi | 75% | 3127 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,612 psi | 67% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,194 psi | 71% | 2933 fps | 99.2% |
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 | 171gr | Peregrine VRG-2. Hodgdon Retumbo delivers the highest muzzle velocity at 3,330 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,330 fps. Accurate 8700 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 171.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.