Load Specifications
Load data in caliber .30-378 Weath. Mag. with .306 | 160gr | Peregrine VLR-4 bullet and 61 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% | 54,027 psi | 85% | 3159 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,970 psi | 88% | 3327 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 88% | 57,000 psi | 89% | 3330 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 55,593 psi | 87% | 3258 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 53,925 psi | 85% | 3268 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 56,478 psi | 89% | 3301 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 3337 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,027 psi | 86% | 3320 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,680 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,129 psi | 86% | 3245 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,302 psi | 85% | 3261 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,999 psi | 88% | 3225 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,391 psi | 88% | 3301 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,797 psi | 89% | 3317 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,375 psi | 85% | 3317 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,911 psi | 86% | 3222 fps | 97.5% |
| Bofors RP15 | <<locked>> | 92% | 57,377 psi | 90% | 3310 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,956 psi | 88% | 3307 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 54,302 psi | 85% | 3261 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 53,954 psi | 85% | 3258 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 57,116 psi | 90% | 3261 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,912 psi | 88% | 3241 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,825 psi | 87% | 3163 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,332 psi | 87% | 3389 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2110 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,375 psi | 85% | 3176 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,737 psi | 86% | 3176 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,377 psi | 90% | 3238 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 56,101 psi | 88% | 3314 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,212 psi | 79% | 3219 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 56,376 psi | 88% | 3205 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,564 psi | 87% | 3182 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,579 psi | 87% | 3235 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,331 psi | 85% | 3278 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,362 psi | 88% | 3225 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,508 psi | 90% | 3340 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 55,521 psi | 87% | 3232 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,912 psi | 88% | 3258 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 2156 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,319 psi | 90% | 3297 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,434 psi | 88% | 3379 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,695 psi | 87% | 3330 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 56,246 psi | 88% | 3225 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 54,795 psi | 86% | 3235 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,376 psi | 88% | 3205 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,985 psi | 89% | 3159 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,404 psi | 85% | 3232 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,041 psi | 85% | 3150 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 53,969 psi | 85% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,187 psi | 86% | 3202 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,216 psi | 87% | 3186 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 57,246 psi | 90% | 3219 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,667 psi | 90% | 3255 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 53,882 psi | 84% | 3278 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 54,621 psi | 86% | 3261 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 56,275 psi | 88% | 3337 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 57,479 psi | 90% | 3399 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,667 psi | 90% | 3156 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,738 psi | 87% | 3314 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,158 psi | 86% | 3196 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,857 psi | 64% | 2907 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 45,020 psi | 71% | 3107 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 42,598 psi | 67% | 3038 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 45,266 psi | 71% | 3061 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 40,437 psi | 63% | 2982 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 36,927 psi | 58% | 2887 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 49,153 psi | 77% | 3251 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 31,285 psi | 49% | 2772 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,982 psi | 81% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,179 psi | 71% | 3051 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,017 psi | 64% | 2989 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,711 psi | 62% | 2933 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,272 psi | 54% | 2848 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,976 psi | 70% | 3110 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,499 psi | 73% | 3163 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,138 psi | 75% | 3091 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,130 psi | 60% | 2917 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 36,637 psi | 57% | 2897 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 41,017 psi | 64% | 2989 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 35,012 psi | 55% | 2838 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 43,076 psi | 68% | 2989 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,279 psi | 66% | 2972 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,849 psi | 77% | 3051 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,359 psi | 52% | 2874 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 44% | 1890 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,952 psi | 80% | 3114 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,227 psi | 80% | 3120 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,280 psi | 69% | 2986 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 39,073 psi | 61% | 2959 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,782 psi | 59% | 2943 fps | 95.8% |
| Lovex S070 | <<locked>> | 80% | 52,837 psi | 83% | 3146 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,896 psi | 55% | 2766 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 51,837 psi | 81% | 3169 fps | 99.5% |
| Norma 217 | <<locked>> | 88% | 32,967 psi | 52% | 2835 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 43,569 psi | 68% | 3068 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,736 psi | 83% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,088 psi | 61% | 2969 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,837 psi | 81% | 3169 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,969 psi | 55% | 2828 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 45% | 1936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,345 psi | 84% | 3235 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,605 psi | 51% | 2841 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 40,538 psi | 64% | 3018 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 46,093 psi | 72% | 3031 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 44,614 psi | 70% | 3038 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 80% | 52,837 psi | 83% | 3146 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,330 psi | 84% | 3097 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,266 psi | 69% | 3031 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 47,152 psi | 74% | 3018 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 50,357 psi | 79% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,976 psi | 70% | 3012 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 39,262 psi | 62% | 2874 fps | 97.8% |
| Vihtavuori N550 | <<locked>> | 80% | 53,505 psi | 84% | 3159 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,092 psi | 69% | 3018 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,381 psi | 68% | 3058 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 38,363 psi | 60% | 2917 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,742 psi | 65% | 3038 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 94% | 49,559 psi | 78% | 3251 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,722 psi | 84% | 3100 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,579 psi | 59% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,466 psi | 65% | 2933 fps | 97.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 68 powders for .30-378 Weath. Mag. loaded with the .306 | 160gr | Peregrine VLR-4. Vihtavuori N570 delivers the highest muzzle velocity at 3,399 fps; across all powders the maximum-charge window runs from 2,110 fps to 3,399 fps. Accurate 8700 gives the best case fill at 100 %, and 68 of the 68 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 160.0 gr projectile in 0.306" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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.