Load Specifications
Load data in caliber .300 AAC Blackout with .309 | 170gr | Reichenberg HDB Universal 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, Lovex S040 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% | 44,715 psi | 88% | 1660 fps | 96.9% |
| ADI AR 2205 | <<locked>> | 96% | 45,527 psi | 90% | 1611 fps | 98.6% |
| Hodgdon LilGun | <<locked>> | 90% | 43,569 psi | 86% | 1712 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,425 psi | 50% | 973 fps | 100% |
| Lovex S040 | <<locked>> | 88% | 44,411 psi | 87% | 1605 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 37,246 psi | 73% | 1577 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,961 psi | 49% | 995 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 34,476 psi | 68% | 1495 fps | 100% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 44,048 psi | 87% | 1645 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 | <<locked>> | 90% | 39,378 psi | 78% | 1599 fps | 95.6% |
| ADI AR 2205 | <<locked>> | 84% | 31,850 psi | 63% | 1442 fps | 95.5% |
| Hodgdon LilGun | 12.1 gr | 80% | 30,980 psi | 61% | 1560 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,188 psi | 36% | 864 fps | 100% |
| Lovex S040 | 10.4 gr | 80% | 35,534 psi | 70% | 1501 fps | 99.6% |
| Lovex S053 | <<locked>> | 94% | 30,501 psi | 60% | 1494 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,724 psi | 35% | 886 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 20,204 psi | 40% | 1264 fps | 97.8% |
| Vihtavuori N110 | 9.8 gr | 80% | 24,439 psi | 48% | 1383 fps | 98.1% |
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 .309 | 170gr | Reichenberg HDB Universal. Hodgdon LilGun delivers the highest muzzle velocity at 1,712 fps; across all powders the maximum-charge window runs from 973 fps to 1,712 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 49–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.309" calls for a 1:12.5 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, Lovex S040, Vihtavuori N110 rank at the top here: for .300 AAC Blackout with the .309 | 170gr | Reichenberg HDB Universal 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.