Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 156gr | Peregrine VRG-2 bullet and 55 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% | 55,854 psi | 88% | 3219 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,085 psi | 85% | 3320 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 55,143 psi | 86% | 3327 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 57,392 psi | 90% | 3320 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 55,941 psi | 88% | 3333 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 54,737 psi | 86% | 3304 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3415 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 3386 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,421 psi | 90% | 3310 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,014 psi | 89% | 3307 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,289 psi | 88% | 3327 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,360 psi | 85% | 3228 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,781 psi | 86% | 3304 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,882 psi | 86% | 3314 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,145 psi | 90% | 3392 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,710 psi | 89% | 3284 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 55,651 psi | 87% | 3314 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 54,476 psi | 85% | 3310 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 56,289 psi | 88% | 3327 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 56,202 psi | 88% | 3327 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 54,969 psi | 86% | 3258 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 86% | 53,838 psi | 84% | 3235 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,421 psi | 90% | 3222 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 53,722 psi | 84% | 3389 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 2149 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,898 psi | 88% | 3235 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,434 psi | 88% | 3238 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,390 psi | 87% | 3238 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 54,186 psi | 85% | 3307 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3287 fps | 99.4% |
| Lovex S071 | <<locked>> | 94% | 57,566 psi | 90% | 3245 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,203 psi | 90% | 3297 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3314 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,391 psi | 88% | 3343 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,535 psi | 87% | 3333 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 57,159 psi | 90% | 3291 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 53,911 psi | 84% | 3251 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,450 psi | 60% | 2198 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,752 psi | 86% | 3376 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,128 psi | 85% | 3327 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 54,128 psi | 85% | 3222 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 56,623 psi | 89% | 3297 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,231 psi | 88% | 3294 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 55,666 psi | 87% | 3209 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 55,811 psi | 87% | 3228 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,855 psi | 89% | 3261 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,000 psi | 89% | 3245 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,231 psi | 88% | 3258 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 55,927 psi | 88% | 3258 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,825 psi | 87% | 3340 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 92% | 56,840 psi | 89% | 3333 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 54,534 psi | 85% | 3333 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 96% | 55,956 psi | 88% | 3399 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,172 psi | 85% | 3314 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,956 psi | 89% | 3258 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,279 psi | 66% | 2969 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 46,731 psi | 73% | 3173 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 44,150 psi | 69% | 3100 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 46,746 psi | 73% | 3120 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 41,916 psi | 66% | 3045 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 38,319 psi | 60% | 2949 fps | 96% |
| ADI AR 2218 | <<locked>> | 96% | 47,558 psi | 75% | 3245 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 82% | 30,327 psi | 48% | 2759 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,621 psi | 84% | 3248 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,615 psi | 73% | 3114 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,583 psi | 67% | 3051 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,176 psi | 65% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,621 psi | 56% | 2910 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,021 psi | 74% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,936 psi | 77% | 3232 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,427 psi | 73% | 3084 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 39,566 psi | 62% | 2976 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 38,159 psi | 60% | 2959 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 42,583 psi | 67% | 3051 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 36,245 psi | 57% | 2897 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 44,527 psi | 70% | 3051 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,743 psi | 69% | 3035 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,270 psi | 79% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,737 psi | 54% | 2940 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1929 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,388 psi | 82% | 3173 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 52,823 psi | 83% | 3179 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,571 psi | 71% | 3045 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,611 psi | 64% | 3022 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,753 psi | 58% | 2936 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 36,172 psi | 57% | 2822 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 53,374 psi | 84% | 3232 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 32,053 psi | 50% | 2822 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 45,266 psi | 71% | 3130 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 40,625 psi | 64% | 3031 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 53,388 psi | 84% | 3228 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,434 psi | 57% | 2887 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 45% | 1975 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,084 psi | 53% | 2907 fps | 97.2% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,670 psi | 67% | 3087 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 47,514 psi | 74% | 3094 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 46,122 psi | 72% | 3100 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,788 psi | 72% | 3094 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 48,457 psi | 76% | 3077 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 52,098 psi | 82% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,470 psi | 73% | 3071 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 40,567 psi | 64% | 2930 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 92% | 52,489 psi | 82% | 3189 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 45,629 psi | 72% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,991 psi | 71% | 3123 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 39,842 psi | 62% | 2976 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 88% | 43,685 psi | 68% | 3107 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 94% | 51,822 psi | 81% | 3320 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,436 psi | 62% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,873 psi | 67% | 2992 fps | 98.2% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 62 powders for .30-378 Weath. Mag. loaded with the .308 | 156gr | Peregrine VRG-2. ADI AR 2218 delivers the highest muzzle velocity at 3,415 fps; across all powders the maximum-charge window runs from 2,149 fps to 3,415 fps. Accurate 8700 gives the best case fill at 100 %, and 62 of the 62 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 156.0 gr projectile in 0.308" calls for a 1:15.5 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.