Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 154gr | Reichenberg HDB Subsonic bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, Accurate No. 11 FS and Vihtavuori N110.
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: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 94% | 45,498 psi | 90% | 1824 fps | 97% |
| ADI AR 2205 | <<locked>> | 96% | 45,382 psi | 89% | 1762 fps | 98.6% |
| Hodgdon LilGun | <<locked>> | 90% | 44,019 psi | 87% | 1873 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 24,976 psi | 49% | 1070 fps | 100% |
| Lovex S040 | <<locked>> | 88% | 44,759 psi | 88% | 1762 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 36,956 psi | 73% | 1736 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 23,917 psi | 47% | 1093 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 34,272 psi | 68% | 1640 fps | 100% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 44,019 psi | 87% | 1798 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | 15.1 gr | 88% | 37,550 psi | 74% | 1722 fps | 95.1% |
| ADI AR 2205 | <<locked>> | 84% | 31,633 psi | 62% | 1575 fps | 95.3% |
| Hodgdon LilGun | 13.8 gr | 80% | 31,169 psi | 61% | 1706 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,072 psi | 36% | 955 fps | 100% |
| Lovex S040 | <<locked>> | 80% | 35,201 psi | 69% | 1640 fps | 99.6% |
| Lovex S053 | <<locked>> | 94% | 31,096 psi | 61% | 1644 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,448 psi | 34% | 978 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 20,175 psi | 40% | 1385 fps | 97.7% |
| Vihtavuori N110 | 11.4 gr | 80% | 24,584 psi | 48% | 1512 fps | 98% |
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 9 powders for .300 AAC Blackout loaded with the .308 | 154gr | Reichenberg HDB Subsonic. Hodgdon LilGun delivers the highest muzzle velocity at 1,873 fps; across all powders the maximum-charge window runs from 1,070 fps to 1,873 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 9 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 154.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, Lovex S053, 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. Hodgdon LilGun, Accurate No. 11 FS, Vihtavuori N110 rank at the top here: for .300 AAC Blackout with the .308 | 154gr | Reichenberg HDB Subsonic they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.