Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 220gr | Nosler Partition 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, Vihtavuori N570 and IMR 8133 Enduron.
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% | 56,884 psi | 89% | 2782 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 2923 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 82% | 56,666 psi | 89% | 2894 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,753 psi | 89% | 2887 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,566 psi | 90% | 3038 fps | 100% |
| ADI AR 2225 | <<locked>> | 92% | 57,043 psi | 89% | 2913 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,290 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,898 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,884 psi | 89% | 2867 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,492 psi | 87% | 2943 fps | 99.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,028 psi | 88% | 2946 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,405 psi | 88% | 2861 fps | 99.8% |
| Bofors RP15 | <<locked>> | 84% | 56,855 psi | 89% | 2877 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,898 psi | 89% | 2904 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,290 psi | 90% | 2884 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,099 psi | 85% | 2844 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,725 psi | 90% | 2864 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,217 psi | 90% | 2969 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,247 psi | 60% | 1831 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 54,230 psi | 85% | 2864 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 55,492 psi | 87% | 2881 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,188 psi | 90% | 2822 fps | 97.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,970 psi | 88% | 2907 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,013 psi | 86% | 2822 fps | 96.7% |
| Lovex S071 | <<locked>> | 86% | 55,709 psi | 87% | 2766 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,580 psi | 90% | 2920 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,174 psi | 90% | 2907 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,942 psi | 89% | 2963 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 84% | 55,477 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,334 psi | 62% | 1873 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,548 psi | 84% | 2890 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,579 psi | 89% | 2936 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,013 psi | 86% | 2822 fps | 96.7% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,201 psi | 87% | 2867 fps | 99.2% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 2844 fps | 97.6% |
| Vihtavuori 24N41 | <<locked>> | 94% | 54,824 psi | 86% | 2871 fps | 96.1% |
| Vihtavuori N165 | <<locked>> | 84% | 57,450 psi | 90% | 2808 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,014 psi | 89% | 2861 fps | 99% |
| Vihtavuori N565 | <<locked>> | 84% | 54,810 psi | 86% | 2858 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,855 psi | 89% | 2936 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 54,766 psi | 86% | 2949 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,725 psi | 90% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,000 psi | 89% | 2818 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% | 53,301 psi | 84% | 2730 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 37,231 psi | 58% | 2549 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 80% | 52,968 psi | 83% | 2835 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,103 psi | 63% | 2602 fps | 99.5% |
| ADI AR 2218 | 96.8 gr | 82% | 36,999 psi | 58% | 2621 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 37,420 psi | 59% | 2579 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,693 psi | 84% | 2831 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,373 psi | 82% | 2736 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,514 psi | 73% | 2710 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,421 psi | 60% | 2612 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 84% | 38,914 psi | 61% | 2615 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,530 psi | 78% | 2746 fps | 99.1% |
| Bofors RP15 | <<locked>> | 80% | 50,082 psi | 78% | 2772 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,511 psi | 68% | 2674 fps | 99.8% |
| Bofors RP5 | <<locked>> | 80% | 53,693 psi | 84% | 2831 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,729 psi | 69% | 2674 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 54,056 psi | 85% | 2808 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,180 psi | 72% | 2795 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,863 psi | 45% | 1637 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 50,517 psi | 79% | 2799 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 80% | 51,880 psi | 81% | 2822 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 44,338 psi | 69% | 2595 fps | 95% |
| IMR 8133 Enduron | 86.7 gr | 80% | 34,940 psi | 55% | 2507 fps | 98.2% |
| Lovex D100 | <<locked>> | 88% | 51,256 psi | 80% | 2759 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 46,151 psi | 72% | 2618 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,766 psi | 56% | 2536 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 53,142 psi | 83% | 2844 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,982 psi | 83% | 2894 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 80% | 47,906 psi | 75% | 2717 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,631 psi | 46% | 1673 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,064 psi | 72% | 2772 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,119 psi | 66% | 2680 fps | 99% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,256 psi | 80% | 2759 fps | 95.8% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,378 psi | 62% | 2572 fps | 95.5% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,542 psi | 71% | 2720 fps | 95.8% |
| Vihtavuori 24N41 | <<locked>> | 92% | 51,140 psi | 80% | 2808 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 50,517 psi | 79% | 2707 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,714 psi | 69% | 2625 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 80% | 47,877 psi | 75% | 2743 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 43,076 psi | 68% | 2690 fps | 98.8% |
| Vihtavuori N570 | 92.5 gr | 80% | 41,234 psi | 65% | 2687 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,635 psi | 84% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,229 psi | 83% | 2762 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 44 powders for .30-378 Weath. Mag. loaded with the .308 | 220gr | Nosler Partition. ADI AR 2218 delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,038 fps. Accurate 8700 gives the best case fill at 100 %, and 44 of the 44 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 1:13.0 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. ADI AR 2218, Vihtavuori N570, IMR 8133 Enduron rank at the top here: for .30-378 Weath. Mag. with the .308 | 220gr | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. 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.