Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 220gr | Alaska Bullet Works Kodiak PP SPBC bullet and 41 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% | 57,029 psi | 89% | 2785 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 53,751 psi | 84% | 2864 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 82% | 56,840 psi | 89% | 2894 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,913 psi | 89% | 2890 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,696 psi | 90% | 3038 fps | 100% |
| ADI AR 2225 | <<locked>> | 92% | 57,203 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,435 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,912 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,058 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,811 psi | 87% | 2946 fps | 99.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,173 psi | 88% | 2946 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,521 psi | 89% | 2861 fps | 99.8% |
| Bofors RP15 | <<locked>> | 84% | 57,000 psi | 89% | 2881 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,072 psi | 89% | 2904 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,435 psi | 90% | 2887 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,273 psi | 85% | 2848 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,406 psi | 90% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1831 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 54,346 psi | 85% | 2864 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 82% | 55,666 psi | 87% | 2884 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,319 psi | 90% | 2825 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,130 psi | 88% | 2907 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,129 psi | 86% | 2825 fps | 96.7% |
| Lovex S071 | <<locked>> | 86% | 55,869 psi | 88% | 2769 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,740 psi | 90% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,334 psi | 90% | 2907 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,058 psi | 89% | 2966 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 84% | 55,637 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,378 psi | 62% | 1873 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,722 psi | 84% | 2894 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,724 psi | 89% | 2936 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,129 psi | 86% | 2825 fps | 96.7% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,317 psi | 87% | 2867 fps | 99.2% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2844 fps | 97.6% |
| Vihtavuori 24N41 | <<locked>> | 94% | 54,926 psi | 86% | 2874 fps | 96.1% |
| Vihtavuori N165 | <<locked>> | 84% | 57,595 psi | 90% | 2808 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,145 psi | 90% | 2864 fps | 99% |
| Vihtavuori N565 | <<locked>> | 84% | 54,969 psi | 86% | 2858 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,014 psi | 89% | 2940 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 54,868 psi | 86% | 2949 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,174 psi | 90% | 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% | 53,461 psi | 84% | 2733 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 37,347 psi | 59% | 2549 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 80% | 53,142 psi | 83% | 2838 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,118 psi | 63% | 2602 fps | 99.5% |
| ADI AR 2218 | 96.9 gr | 82% | 36,985 psi | 58% | 2618 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 37,550 psi | 59% | 2582 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,838 psi | 84% | 2831 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,518 psi | 82% | 2736 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,673 psi | 73% | 2713 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,522 psi | 60% | 2615 fps | 96.2% |
| Alliant Reloder-50 | <<locked>> | 84% | 39,044 psi | 61% | 2618 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,661 psi | 78% | 2746 fps | 99.1% |
| Bofors RP15 | <<locked>> | 80% | 50,082 psi | 78% | 2772 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,642 psi | 68% | 2677 fps | 99.8% |
| Bofors RP5 | <<locked>> | 80% | 53,838 psi | 84% | 2831 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,859 psi | 69% | 2674 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,325 psi | 73% | 2795 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,805 psi | 45% | 1637 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 50,618 psi | 79% | 2799 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 80% | 52,025 psi | 82% | 2825 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 44,338 psi | 69% | 2595 fps | 95% |
| IMR 8133 Enduron | 86.9 gr | 80% | 35,085 psi | 55% | 2510 fps | 98.3% |
| Lovex D100 | <<locked>> | 88% | 51,372 psi | 81% | 2762 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 46,296 psi | 73% | 2621 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,781 psi | 56% | 2536 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 53,316 psi | 84% | 2848 fps | 100% |
| Ramshot LRT | <<locked>> | 90% | 49,530 psi | 78% | 2831 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 48,051 psi | 75% | 2720 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,689 psi | 47% | 1677 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,079 psi | 72% | 2772 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,250 psi | 66% | 2684 fps | 99% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,372 psi | 81% | 2762 fps | 95.8% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,479 psi | 62% | 2572 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,672 psi | 72% | 2720 fps | 95.9% |
| Vihtavuori 24N41 | <<locked>> | 92% | 51,256 psi | 80% | 2808 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 50,633 psi | 79% | 2707 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,714 psi | 69% | 2625 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 80% | 48,022 psi | 75% | 2743 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 43,076 psi | 68% | 2690 fps | 98.8% |
| Vihtavuori N570 | 92.6 gr | 80% | 41,234 psi | 65% | 2687 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,359 psi | 84% | 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 42 powders for .30-378 Weath. Mag. loaded with the .308 | 220gr | Alaska Bullet Works Kodiak PP SPBC. 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. Hodgdon TrailBoss gives the best case fill at 100 %, and 42 of the 42 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. 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, Vihtavuori N570, IMR 8133 Enduron rank at the top here: for .30-378 Weath. Mag. with the .308 | 220gr | Alaska Bullet Works Kodiak PP SPBC 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.