Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Berger VLD Target bullet and 57 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% | 55,303 psi | 87% | 3215 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,159 psi | 90% | 3383 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,259 psi | 85% | 3317 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 56,463 psi | 88% | 3310 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,911 psi | 86% | 3320 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 57,493 psi | 90% | 3353 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 3392 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3373 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,594 psi | 89% | 3304 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,188 psi | 88% | 3301 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,390 psi | 87% | 3317 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,203 psi | 90% | 3281 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,421 psi | 90% | 3353 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 53,882 psi | 84% | 3310 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,898 psi | 88% | 3379 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,724 psi | 87% | 3271 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 54,795 psi | 86% | 3304 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 57,363 psi | 90% | 3366 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 55,390 psi | 87% | 3317 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,201 psi | 87% | 3314 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,244 psi | 85% | 3248 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,869 psi | 89% | 3294 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,782 psi | 89% | 3215 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,492 psi | 89% | 3448 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2142 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,143 psi | 86% | 3228 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,782 psi | 87% | 3232 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,650 psi | 86% | 3228 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 57,116 psi | 90% | 3366 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,590 psi | 81% | 3281 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,348 psi | 90% | 3261 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,985 psi | 89% | 3241 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,507 psi | 89% | 3291 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 3307 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,506 psi | 87% | 3333 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,319 psi | 90% | 3278 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,331 psi | 85% | 3320 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 56,507 psi | 89% | 3287 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,087 psi | 89% | 3310 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 2195 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,696 psi | 90% | 3435 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,145 psi | 90% | 3392 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 57,145 psi | 90% | 3278 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 55,811 psi | 87% | 3287 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,348 psi | 90% | 3261 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,419 psi | 87% | 3284 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,984 psi | 86% | 3202 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,042 psi | 86% | 3225 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,231 psi | 88% | 3255 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,231 psi | 88% | 3238 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,419 psi | 87% | 3258 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,940 psi | 86% | 3333 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 55,956 psi | 88% | 3320 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 96% | 57,537 psi | 90% | 3392 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 96% | 54,650 psi | 86% | 3383 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,232 psi | 90% | 3376 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,173 psi | 88% | 3251 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,192 psi | 66% | 2969 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 46,180 psi | 72% | 3169 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 43,714 psi | 69% | 3097 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 46,166 psi | 72% | 3114 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 41,466 psi | 65% | 3041 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 37,884 psi | 59% | 2943 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 50,299 psi | 79% | 3310 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 82% | 30,211 psi | 47% | 2759 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,939 psi | 83% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,093 psi | 72% | 3107 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,177 psi | 66% | 3048 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,828 psi | 64% | 2992 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,331 psi | 55% | 2907 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,340 psi | 73% | 3173 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,805 psi | 75% | 3219 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,023 psi | 77% | 3143 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 39,175 psi | 61% | 2972 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 37,855 psi | 59% | 2959 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 42,177 psi | 66% | 3048 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 82% | 35,926 psi | 56% | 2894 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 44,092 psi | 69% | 3045 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,308 psi | 68% | 3025 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,777 psi | 78% | 3104 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,476 psi | 54% | 2936 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1923 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,793 psi | 81% | 3166 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,315 psi | 82% | 3176 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,121 psi | 71% | 3038 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 40,147 psi | 63% | 3018 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,030 psi | 61% | 3005 fps | 96% |
| Lovex S070 | <<locked>> | 80% | 53,867 psi | 84% | 3202 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,303 psi | 57% | 2831 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 52,649 psi | 83% | 3222 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 31,879 psi | 50% | 2828 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 44,715 psi | 70% | 3130 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 53,751 psi | 84% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,074 psi | 63% | 3025 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 52,721 psi | 83% | 3222 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,129 psi | 57% | 2887 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 1969 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,808 psi | 53% | 2907 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,959 psi | 66% | 3084 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 46,992 psi | 74% | 3087 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 45,643 psi | 72% | 3094 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 80% | 53,867 psi | 84% | 3202 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,310 psi | 71% | 3091 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 48,080 psi | 75% | 3071 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 51,503 psi | 81% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,166 psi | 72% | 3068 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,248 psi | 63% | 2930 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 45,382 psi | 71% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,425 psi | 70% | 3117 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 39,624 psi | 62% | 2982 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 43,004 psi | 67% | 3100 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 50,879 psi | 80% | 3307 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,740 psi | 61% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,409 psi | 66% | 2986 fps | 97.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 64 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Berger VLD Target. Hodgdon Retumbo delivers the highest muzzle velocity at 3,448 fps; across all powders the maximum-charge window runs from 2,142 fps to 3,448 fps. Accurate 8700 gives the best case fill at 100 %, and 64 of the 64 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 155.0 gr projectile in 0.308" calls for a 1:12.5 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.