Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 171gr | Peregrine VLR-5 bullet and 53 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>> | 88% | 56,550 psi | 89% | 3114 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,766 psi | 86% | 3219 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 86% | 55,811 psi | 87% | 3225 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 54,375 psi | 85% | 3153 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,739 psi | 89% | 3228 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 55,579 psi | 87% | 3202 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 3323 fps | 98.4% |
| ADI AR 2225 | <<locked>> | 98% | 54,346 psi | 85% | 3219 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,638 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,029 psi | 89% | 3219 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,071 psi | 86% | 3120 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,477 psi | 87% | 3196 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,709 psi | 87% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 53,606 psi | 84% | 3225 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 3202 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,363 psi | 90% | 3186 fps | 98.4% |
| Bofors RP15 | <<locked>> | 90% | 56,376 psi | 88% | 3209 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,245 psi | 87% | 3212 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 57,029 psi | 89% | 3219 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,029 psi | 89% | 3225 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,709 psi | 87% | 3156 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,534 psi | 85% | 3136 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,578 psi | 86% | 3054 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,592 psi | 86% | 3287 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 2047 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,565 psi | 89% | 3123 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,203 psi | 90% | 3127 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,043 psi | 88% | 3133 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 55,143 psi | 86% | 3209 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,185 psi | 83% | 3192 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 54,650 psi | 86% | 3084 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 3219 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,276 psi | 90% | 3238 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,275 psi | 88% | 3232 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 54,752 psi | 86% | 3150 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 2093 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,463 psi | 87% | 3271 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,708 psi | 86% | 3232 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 54,955 psi | 86% | 3120 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 57,421 psi | 90% | 3189 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,029 psi | 89% | 3189 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,333 psi | 88% | 3110 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 56,666 psi | 89% | 3117 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,566 psi | 90% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 53,969 psi | 85% | 3081 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,855 psi | 89% | 3163 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 86% | 56,666 psi | 89% | 3146 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,710 psi | 89% | 3241 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 57,406 psi | 90% | 3228 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 94% | 55,332 psi | 87% | 3235 fps | 99% |
| Vihtavuori N570 | <<locked>> | 96% | 56,753 psi | 89% | 3304 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,129 psi | 86% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 53,809 psi | 84% | 3091 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,859 psi | 67% | 2874 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 47,471 psi | 74% | 3081 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 44,846 psi | 70% | 3012 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 47,427 psi | 74% | 3025 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 42,583 psi | 67% | 2956 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 84% | 36,274 psi | 57% | 2799 fps | 96% |
| ADI AR 2218 | <<locked>> | 94% | 44,643 psi | 70% | 3077 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 28,732 psi | 45% | 2618 fps | 95.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,166 psi | 74% | 3012 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,221 psi | 68% | 2959 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,930 psi | 66% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,289 psi | 57% | 2825 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,732 psi | 75% | 3074 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,788 psi | 72% | 3071 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,052 psi | 77% | 3123 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,005 psi | 69% | 2927 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 40,190 psi | 63% | 2890 fps | 98% |
| Bofors RP30 | <<locked>> | 82% | 36,216 psi | 57% | 2812 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 43,221 psi | 68% | 2959 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 34,287 psi | 54% | 2746 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 45,179 psi | 71% | 2956 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,338 psi | 69% | 2940 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,981 psi | 80% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,331 psi | 55% | 2861 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,069 psi | 83% | 3068 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,563 psi | 84% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,180 psi | 72% | 2949 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 41,249 psi | 65% | 2933 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,867 psi | 55% | 2795 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 36,782 psi | 58% | 2736 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 30,443 psi | 48% | 2687 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 46,035 psi | 72% | 3038 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 41,336 psi | 65% | 2946 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 37,202 psi | 58% | 2808 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 1877 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,664 psi | 54% | 2835 fps | 98.3% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 40,016 psi | 63% | 2930 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 48,124 psi | 75% | 2992 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 46,833 psi | 73% | 3002 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,485 psi | 73% | 2999 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 49,081 psi | 77% | 2979 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 52,924 psi | 83% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,123 psi | 74% | 2976 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,104 psi | 64% | 2838 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 49,545 psi | 78% | 3028 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 46,427 psi | 73% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,701 psi | 72% | 3031 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 37,768 psi | 59% | 2828 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 86% | 41,234 psi | 65% | 2953 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 92% | 48,820 psi | 77% | 3153 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,277 psi | 63% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,540 psi | 68% | 2900 fps | 98.8% |
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 | 171gr | Peregrine VLR-5. ADI AR 2218 delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,047 fps to 3,323 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 171.0 gr projectile in 0.308" calls for a 1:11.0 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. 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.