Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 240gr | Woodleigh PP SN bullet and 33 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Alliant Reloder-33 and Ramshot LRT.
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 8700 | <<locked>> | 98% | 57,450 psi | 90% | 2812 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 88% | 56,347 psi | 88% | 2766 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 57,493 psi | 90% | 2923 fps | 100% |
| ADI AR 2225 | <<locked>> | 90% | 56,884 psi | 89% | 2792 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 56,608 psi | 89% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 55,376 psi | 87% | 2828 fps | 99.9% |
| Alliant Reloder-50 | <<locked>> | 92% | 56,043 psi | 88% | 2835 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 55,550 psi | 87% | 2740 fps | 99.9% |
| Bofors RP15 | <<locked>> | 82% | 56,275 psi | 88% | 2756 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 56,550 psi | 89% | 2782 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 57,551 psi | 90% | 2779 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 57,116 psi | 90% | 2848 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,450 psi | 60% | 1755 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 57,653 psi | 90% | 2815 fps | 97.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 56,347 psi | 88% | 2707 fps | 98.5% |
| IMR 8133 Enduron | <<locked>> | 92% | 55,927 psi | 88% | 2792 fps | 100% |
| Lovex D100 | <<locked>> | 88% | 54,215 psi | 85% | 2710 fps | 97.4% |
| Lovex S071 | <<locked>> | 84% | 55,201 psi | 87% | 2644 fps | 100% |
| Norma 217 | <<locked>> | 92% | 57,667 psi | 90% | 2808 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 56,710 psi | 89% | 2854 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 82% | 54,911 psi | 86% | 2710 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,581 psi | 62% | 1798 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 57,537 psi | 90% | 2828 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 56,362 psi | 88% | 2818 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 88% | 54,215 psi | 85% | 2710 fps | 97.4% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 55,100 psi | 86% | 2759 fps | 99.6% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2802 fps | 98.9% |
| Vihtavuori 24N41 | <<locked>> | 92% | 54,404 psi | 85% | 2762 fps | 97% |
| Vihtavuori N165 | <<locked>> | 82% | 56,753 psi | 89% | 2687 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 56,333 psi | 88% | 2746 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 82% | 54,375 psi | 85% | 2740 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 56,608 psi | 89% | 2822 fps | 100% |
| Vihtavuori N570 | <<locked>> | 86% | 54,621 psi | 86% | 2835 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 8700 | <<locked>> | 84% | 34,751 psi | 54% | 2398 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 80% | 42,830 psi | 67% | 2552 fps | 100% |
| ADI AR 2218 | 93.5 gr | 80% | 36,753 psi | 58% | 2523 fps | 96.8% |
| ADI AR 2225 | <<locked>> | 80% | 40,263 psi | 63% | 2533 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 49,516 psi | 78% | 2644 fps | 100% |
| Alliant Reloder-33 | 95.3 gr | 80% | 41,423 psi | 65% | 2579 fps | 98% |
| Alliant Reloder-50 | <<locked>> | 80% | 36,376 psi | 57% | 2464 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 52,112 psi | 82% | 2684 fps | 99.8% |
| Bofors RP15 | <<locked>> | 80% | 52,910 psi | 83% | 2707 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 46,354 psi | 73% | 2621 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 46,702 psi | 73% | 2618 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 49,647 psi | 78% | 2736 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,964 psi | 45% | 1568 fps | 100% |
| Hodgdon US 869 | <<locked>> | 90% | 46,891 psi | 73% | 2638 fps | 95.1% |
| IMR 7977 Enduron | <<locked>> | 80% | 46,528 psi | 73% | 2543 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 37,492 psi | 59% | 2467 fps | 99.4% |
| Lovex D100 | <<locked>> | 84% | 47,195 psi | 74% | 2592 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 48,689 psi | 76% | 2552 fps | 100% |
| Norma 217 | <<locked>> | 80% | 38,537 psi | 60% | 2493 fps | 100% |
| Ramshot LRT | 100.4 gr | 86% | 45,905 psi | 72% | 2664 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 51,140 psi | 80% | 2657 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,892 psi | 47% | 1608 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 49,574 psi | 78% | 2717 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 45,324 psi | 71% | 2638 fps | 99.8% |
| Shooters World 50 BMG | <<locked>> | 84% | 47,195 psi | 74% | 2592 fps | 95.8% |
| SNPE Vectan SP 13 | <<locked>> | 84% | 36,767 psi | 58% | 2421 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 92% | 42,554 psi | 67% | 2566 fps | 95.9% |
| Vihtavuori 24N41 | <<locked>> | 88% | 47,210 psi | 74% | 2641 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 53,200 psi | 83% | 2638 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 46,137 psi | 72% | 2575 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 50,821 psi | 80% | 2684 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 45,963 psi | 72% | 2644 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 80% | 44,121 psi | 69% | 2648 fps | 98.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 33 powders for .30-378 Weath. Mag. loaded with the .308 | 240gr | Woodleigh PP SN. ADI AR 2218 delivers the highest muzzle velocity at 2,923 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,923 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 33 of the 33 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 240.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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. ADI AR 2218, Alliant Reloder-33, Ramshot LRT rank at the top here: for .30-378 Weath. Mag. with the .308 | 240gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.