Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 186gr | Peregrine VRG-2 bullet and 52 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% | 57,435 psi | 90% | 3015 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 2986 fps | 97.1% |
| Accurate High Country | <<locked>> | 82% | 55,796 psi | 87% | 3123 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 56,840 psi | 89% | 3136 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 54,984 psi | 86% | 3054 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,667 psi | 90% | 3133 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,927 psi | 89% | 3114 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,595 psi | 90% | 3251 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 96% | 56,376 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,607 psi | 86% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,230 psi | 85% | 3064 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,202 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,029 psi | 89% | 3104 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,884 psi | 89% | 3107 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,361 psi | 87% | 3150 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,230 psi | 87% | 3136 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,172 psi | 85% | 3031 fps | 98.7% |
| Bofors RP15 | <<locked>> | 88% | 57,421 psi | 90% | 3114 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,724 psi | 89% | 3123 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,230 psi | 85% | 3064 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,317 psi | 85% | 3071 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,231 psi | 88% | 3058 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,216 psi | 87% | 3041 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,681 psi | 89% | 3199 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1982 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,318 psi | 88% | 3035 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,086 psi | 88% | 3114 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 54,984 psi | 86% | 2986 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,187 psi | 86% | 3117 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,738 psi | 87% | 2989 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,594 psi | 89% | 3136 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,215 psi | 85% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,653 psi | 90% | 3143 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,956 psi | 88% | 3061 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,856 psi | 61% | 2028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,580 psi | 90% | 3182 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,449 psi | 88% | 3153 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,317 psi | 87% | 3022 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,389 psi | 85% | 3035 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,097 psi | 80% | 2995 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,711 psi | 90% | 3087 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,492 psi | 89% | 3012 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,563 psi | 86% | 2999 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,723 psi | 86% | 2989 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,725 psi | 90% | 3081 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 82% | 54,143 psi | 85% | 2995 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,609 psi | 90% | 3146 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 54,897 psi | 86% | 3077 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 56,913 psi | 89% | 3156 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,346 psi | 85% | 3156 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,232 psi | 90% | 3117 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,346 psi | 85% | 2995 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,804 psi | 73% | 2844 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 42,351 psi | 66% | 2848 fps | 95% |
| Accurate High Country | <<locked>> | 80% | 52,083 psi | 82% | 3061 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,226 psi | 77% | 2999 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 51,314 psi | 80% | 2989 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 46,572 psi | 73% | 2936 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 34,505 psi | 54% | 2664 fps | 96.5% |
| ADI AR 2218 | <<locked>> | 90% | 42,540 psi | 67% | 2940 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 31,778 psi | 50% | 2628 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,053 psi | 80% | 2982 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,239 psi | 74% | 2936 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,876 psi | 72% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,103 psi | 63% | 2805 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,779 psi | 83% | 3045 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,947 psi | 69% | 2927 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 43,816 psi | 69% | 2913 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,353 psi | 70% | 2841 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 43,874 psi | 69% | 2867 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 37,304 psi | 58% | 2743 fps | 97.5% |
| Bofors RP5 | <<locked>> | 80% | 47,239 psi | 74% | 2936 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 37,695 psi | 59% | 2746 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 80% | 48,979 psi | 77% | 2933 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,109 psi | 75% | 2917 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,218 psi | 61% | 2864 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,516 psi | 78% | 2917 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 45,368 psi | 71% | 2920 fps | 99% |
| IMR 7977 Enduron | <<locked>> | 88% | 51,561 psi | 81% | 2923 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,823 psi | 53% | 2667 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 40,219 psi | 63% | 2717 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,515 psi | 46% | 2562 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 50,575 psi | 79% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,006 psi | 72% | 2940 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 41,205 psi | 65% | 2802 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1814 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,711 psi | 61% | 2838 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,462 psi | 56% | 2720 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 51,721 psi | 81% | 2959 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 50,749 psi | 80% | 2969 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,396 psi | 70% | 2864 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,401 psi | 79% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 52,837 psi | 83% | 2949 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,024 psi | 80% | 2940 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,730 psi | 70% | 2815 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 46,963 psi | 74% | 2884 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 50,560 psi | 79% | 2940 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,067 psi | 78% | 3015 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 41,553 psi | 65% | 2818 fps | 98% |
| Vihtavuori N568 | <<locked>> | 82% | 39,450 psi | 62% | 2812 fps | 96.1% |
| Vihtavuori N570 | <<locked>> | 86% | 43,540 psi | 68% | 2936 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,469 psi | 71% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,297 psi | 74% | 2874 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 186gr | Peregrine VRG-2. ADI AR 2218 delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,251 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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 186.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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 50BMG, Hodgdon US 869, Vihtavuori 20N29 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.