Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 220gr | Nosler Custom Competition bullet and 43 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Ramshot LRT and Vihtavuori N570.
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% | 55,782 psi | 87% | 2766 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 2900 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 82% | 56,101 psi | 88% | 2900 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 82% | 55,535 psi | 87% | 2874 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 55,492 psi | 87% | 2871 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,956 psi | 88% | 3012 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 92% | 55,434 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,159 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,708 psi | 86% | 2769 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,767 psi | 87% | 2851 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,085 psi | 85% | 2920 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 54,520 psi | 85% | 2920 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,448 psi | 87% | 2841 fps | 99.7% |
| Bofors RP15 | <<locked>> | 84% | 55,738 psi | 87% | 2861 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 55,695 psi | 87% | 2884 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,159 psi | 88% | 2867 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,072 psi | 89% | 2887 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,317 psi | 85% | 2812 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,695 psi | 89% | 2848 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 55,767 psi | 87% | 2949 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,247 psi | 60% | 1824 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 56,753 psi | 89% | 2900 fps | 96.5% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,580 psi | 90% | 2835 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,202 psi | 88% | 2802 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,621 psi | 86% | 2887 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 57,711 psi | 90% | 2864 fps | 97.1% |
| Lovex S071 | <<locked>> | 86% | 54,636 psi | 86% | 2749 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,159 psi | 88% | 2904 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 55,506 psi | 87% | 2940 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 82% | 55,463 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,334 psi | 62% | 1867 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,246 psi | 88% | 2933 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,274 psi | 87% | 2917 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 57,711 psi | 90% | 2864 fps | 97.1% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 2904 fps | 99.4% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 2818 fps | 97.2% |
| Vihtavuori 24N41 | <<locked>> | 96% | 57,392 psi | 90% | 2910 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 84% | 56,449 psi | 88% | 2792 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,869 psi | 88% | 2841 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 86% | 57,261 psi | 90% | 2894 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 55,535 psi | 87% | 2917 fps | 100% |
| Vihtavuori N570 | <<locked>> | 90% | 57,319 psi | 90% | 2989 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,188 psi | 88% | 2864 fps | 100% |
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 3100 | <<locked>> | 80% | 52,330 psi | 82% | 2717 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 38,986 psi | 61% | 2589 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 52,214 psi | 82% | 2835 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 51,851 psi | 81% | 2818 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,088 psi | 61% | 2582 fps | 99.3% |
| ADI AR 2218 | 94.9 gr | 82% | 36,100 psi | 57% | 2595 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 36,434 psi | 57% | 2562 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,562 psi | 82% | 2815 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,358 psi | 80% | 2720 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,527 psi | 71% | 2694 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,376 psi | 59% | 2592 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 84% | 37,898 psi | 59% | 2595 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,689 psi | 76% | 2730 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 48,965 psi | 77% | 2753 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,554 psi | 67% | 2657 fps | 99.7% |
| Bofors RP5 | <<locked>> | 80% | 52,562 psi | 82% | 2815 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,205 psi | 63% | 2605 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 47,790 psi | 75% | 2703 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,026 psi | 83% | 2789 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,889 psi | 70% | 2772 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,805 psi | 45% | 1631 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 52,794 psi | 83% | 2838 fps | 95.6% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,012 psi | 85% | 2779 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,470 psi | 73% | 2635 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,069 psi | 53% | 2487 fps | 97.9% |
| Lovex D100 | <<locked>> | 88% | 50,111 psi | 79% | 2740 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 45,339 psi | 71% | 2605 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,693 psi | 54% | 2513 fps | 99.5% |
| Ramshot LRT | 106.2 gr | 92% | 51,706 psi | 81% | 2874 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 80% | 51,430 psi | 81% | 2772 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,588 psi | 46% | 1667 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,802 psi | 70% | 2753 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,002 psi | 64% | 2657 fps | 98.7% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,111 psi | 79% | 2740 fps | 95.4% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 38,348 psi | 60% | 2549 fps | 95.1% |
| Vihtavuori 20N29 | <<locked>> | 96% | 44,266 psi | 69% | 2694 fps | 95.3% |
| Vihtavuori 24N41 | <<locked>> | 94% | 53,447 psi | 84% | 2848 fps | 95.7% |
| Vihtavuori N165 | <<locked>> | 80% | 49,632 psi | 78% | 2690 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 42,728 psi | 67% | 2605 fps | 96% |
| Vihtavuori N565 | <<locked>> | 80% | 46,833 psi | 73% | 2723 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 41,930 psi | 66% | 2671 fps | 98.5% |
| Vihtavuori N570 | 90.6 gr | 80% | 40,074 psi | 63% | 2664 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,301 psi | 82% | 2808 fps | 100% |
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 43 powders for .30-378 Weath. Mag. loaded with the .308 | 220gr | Nosler Custom Competition. ADI AR 2218 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,012 fps. Accurate 8700 gives the best case fill at 100 %, and 43 of the 43 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 220.0 gr projectile in 0.308" calls for a 1:11.5 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. ADI AR 2218, Ramshot LRT, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 220gr | Nosler Custom Competition 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.