Load Specifications
Load data in caliber .30-378 Weath. Mag. with .31 | 200gr | Lapua D166 bullet and 44 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>> | 82% | 54,259 psi | 85% | 2871 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 2986 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 82% | 57,290 psi | 90% | 3048 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,725 psi | 90% | 3038 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,522 psi | 90% | 3025 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,027 psi | 85% | 3100 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 57,348 psi | 90% | 3048 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,505 psi | 85% | 2969 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,623 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,740 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,202 psi | 88% | 3074 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,594 psi | 89% | 3071 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,595 psi | 90% | 2999 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 54,085 psi | 85% | 2963 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,624 psi | 90% | 3041 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,505 psi | 85% | 2969 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,897 psi | 86% | 2982 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,086 psi | 88% | 2963 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,114 psi | 86% | 2949 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,566 psi | 90% | 3110 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1919 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,101 psi | 88% | 2936 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,463 psi | 88% | 3025 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,810 psi | 86% | 2897 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,347 psi | 88% | 3038 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 56,028 psi | 88% | 2949 fps | 95.9% |
| Lovex S071 | <<locked>> | 88% | 56,492 psi | 89% | 2904 fps | 100% |
| Norma 217 | <<locked>> | 94% | 54,244 psi | 85% | 3002 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,896 psi | 84% | 2986 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 57,725 psi | 90% | 3094 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 86% | 56,405 psi | 88% | 2969 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 61% | 1965 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,128 psi | 85% | 3031 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,435 psi | 90% | 3074 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 56,028 psi | 88% | 2949 fps | 95.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 2992 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 84% | 54,940 psi | 86% | 2897 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,302 psi | 85% | 2936 fps | 98% |
| Vihtavuori N560 | <<locked>> | 82% | 57,725 psi | 90% | 3051 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,593 psi | 87% | 2995 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 57,638 psi | 90% | 3071 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 55,361 psi | 87% | 3081 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 54,128 psi | 85% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,360 psi | 85% | 2904 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 50,821 psi | 80% | 2818 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 40,292 psi | 63% | 2720 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 53,432 psi | 84% | 2986 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 50,212 psi | 79% | 2913 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 37,797 psi | 59% | 2664 fps | 98.4% |
| ADI AR 2218 | <<locked>> | 86% | 40,248 psi | 63% | 2805 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 35,041 psi | 55% | 2638 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,952 psi | 80% | 2910 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,763 psi | 78% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,961 psi | 69% | 2789 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 38,798 psi | 61% | 2730 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,134 psi | 66% | 2795 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,442 psi | 74% | 2822 fps | 98% |
| Bofors RP15 | <<locked>> | 80% | 47,543 psi | 75% | 2851 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 41,089 psi | 64% | 2743 fps | 99.1% |
| Bofors RP5 | <<locked>> | 80% | 50,952 psi | 80% | 2910 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,104 psi | 64% | 2736 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 80% | 52,431 psi | 82% | 2904 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,488 psi | 81% | 2890 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,120 psi | 68% | 2861 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 45% | 1716 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,721 psi | 83% | 2884 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 49,226 psi | 77% | 2904 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 84% | 48,153 psi | 75% | 2776 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,706 psi | 51% | 2556 fps | 96.4% |
| Lovex D100 | <<locked>> | 90% | 52,243 psi | 82% | 2887 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,830 psi | 69% | 2697 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,301 psi | 52% | 2585 fps | 98.7% |
| Ramshot Grand | <<locked>> | 80% | 50,111 psi | 79% | 2923 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 53,751 psi | 84% | 3022 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 45,252 psi | 71% | 2792 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 46% | 1759 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,888 psi | 67% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,450 psi | 62% | 2733 fps | 97.5% |
| Shooters World 50 BMG | <<locked>> | 90% | 52,243 psi | 82% | 2887 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,482 psi | 67% | 2743 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 80% | 48,240 psi | 76% | 2789 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,353 psi | 70% | 2749 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 80% | 53,969 psi | 85% | 2989 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 45,353 psi | 71% | 2812 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 80% | 40,451 psi | 63% | 2749 fps | 97.3% |
| Vihtavuori N570 | <<locked>> | 82% | 41,437 psi | 65% | 2805 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,256 psi | 79% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,778 psi | 80% | 2844 fps | 100% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 48 powders for .30-378 Weath. Mag. loaded with the .31 | 200gr | Lapua D166. Hodgdon Retumbo delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,110 fps. Accurate 8700 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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, Hodgdon 50BMG 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.