Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 168gr | Frontier PH HPFB 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% | 54,215 psi | 85% | 3094 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,927 psi | 88% | 3258 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 86% | 56,913 psi | 89% | 3261 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 55,187 psi | 86% | 3182 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,682 psi | 90% | 3264 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 56,492 psi | 89% | 3235 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3360 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 55,492 psi | 87% | 3258 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,824 psi | 86% | 3173 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,288 psi | 85% | 3192 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,217 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,536 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,927 psi | 89% | 3248 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,810 psi | 86% | 3264 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3248 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,476 psi | 85% | 3153 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 57,290 psi | 90% | 3241 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,347 psi | 88% | 3248 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,288 psi | 85% | 3192 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 54,041 psi | 85% | 3196 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,463 psi | 88% | 3186 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,492 psi | 87% | 3169 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,535 psi | 87% | 3087 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,637 psi | 87% | 3323 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 2067 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,334 psi | 90% | 3156 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,768 psi | 89% | 3163 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 55,941 psi | 88% | 3241 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3232 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,057 psi | 88% | 3120 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,709 psi | 87% | 3258 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,288 psi | 85% | 3209 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,305 psi | 90% | 3268 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 55,796 psi | 87% | 3186 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 2113 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,710 psi | 89% | 3310 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,985 psi | 88% | 3268 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 55,724 psi | 87% | 3150 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 54,578 psi | 86% | 3163 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,201 psi | 85% | 3156 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,246 psi | 90% | 3140 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 57,725 psi | 90% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,897 psi | 86% | 3127 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,984 psi | 86% | 3117 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,302 psi | 85% | 3130 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 54,360 psi | 85% | 3133 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,551 psi | 90% | 3274 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 54,926 psi | 86% | 3202 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,565 psi | 89% | 3278 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 53,824 psi | 84% | 3268 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,420 psi | 88% | 3248 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,839 psi | 86% | 3127 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,164 psi | 69% | 2913 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 48,515 psi | 76% | 3120 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 45,977 psi | 72% | 3051 fps | 97.3% |
| ADI AR 2209 | <<locked>> | 80% | 48,283 psi | 76% | 3058 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 43,453 psi | 68% | 2992 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 34,708 psi | 54% | 2769 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 45,730 psi | 72% | 3117 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 29,747 psi | 47% | 2664 fps | 96% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,051 psi | 75% | 3045 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,222 psi | 69% | 2999 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,989 psi | 67% | 2933 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,289 psi | 58% | 2864 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,023 psi | 77% | 3117 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,021 psi | 74% | 3110 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,876 psi | 73% | 3097 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,773 psi | 70% | 2959 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 41,205 psi | 65% | 2927 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 34,722 psi | 54% | 2785 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 44,222 psi | 69% | 2999 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 35,215 psi | 55% | 2789 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 46,021 psi | 72% | 2989 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,223 psi | 71% | 2972 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,967 psi | 81% | 3035 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,332 psi | 57% | 2907 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,882 psi | 84% | 3100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,992 psi | 74% | 2982 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,177 psi | 66% | 2969 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,085 psi | 57% | 2841 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 38,130 psi | 60% | 2782 fps | 99.3% |
| Norma 217 | <<locked>> | 84% | 31,633 psi | 50% | 2736 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 47,065 psi | 74% | 3074 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 42,482 psi | 67% | 2989 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 80% | 38,247 psi | 60% | 2848 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1896 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,795 psi | 56% | 2877 fps | 98.6% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,232 psi | 60% | 2900 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 48,965 psi | 77% | 3028 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 47,805 psi | 75% | 3038 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,471 psi | 74% | 3035 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 50,038 psi | 78% | 3015 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 53,969 psi | 85% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,138 psi | 75% | 3009 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,076 psi | 66% | 2874 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 50,618 psi | 79% | 3064 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 47,645 psi | 75% | 3015 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,673 psi | 73% | 3068 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 38,928 psi | 61% | 2871 fps | 96.1% |
| Vihtavuori N568 | <<locked>> | 86% | 42,366 psi | 66% | 2992 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 90% | 46,499 psi | 73% | 3120 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,553 psi | 65% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,483 psi | 70% | 2936 fps | 98.9% |
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 | 168gr | Frontier PH HPFB. ADI AR 2218 delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,360 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 168.0 gr projectile in 0.308" calls for a 1:12.0 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.