Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 150gr | Barnes TSX FN FB bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate No. 11 FS, Vihtavuori N110 and ADI AR 2205.
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>> | 92% | 44,483 psi | 88% | 1870 fps | 97.1% |
| ADI AR 2205 | <<locked>> | 94% | 44,686 psi | 88% | 1811 fps | 98.7% |
| Hodgdon LilGun | <<locked>> | 88% | 43,685 psi | 86% | 1926 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,353 psi | 50% | 1112 fps | 100% |
| Lovex S040 | <<locked>> | 86% | 43,540 psi | 86% | 1801 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 38,769 psi | 76% | 1814 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,279 psi | 48% | 1135 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 35,839 psi | 71% | 1713 fps | 100% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 45,788 psi | 90% | 1873 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 | 15.8 gr | 86% | 36,579 psi | 72% | 1762 fps | 95.1% |
| ADI AR 2205 | 13.9 gr | 82% | 31,314 psi | 62% | 1621 fps | 95.6% |
| Hodgdon LilGun | <<locked>> | 80% | 32,851 psi | 65% | 1781 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,217 psi | 36% | 991 fps | 100% |
| Lovex S040 | <<locked>> | 80% | 36,753 psi | 72% | 1713 fps | 99.8% |
| Lovex S053 | <<locked>> | 92% | 30,719 psi | 61% | 1690 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,593 psi | 35% | 1014 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 21,002 psi | 41% | 1447 fps | 98.3% |
| Vihtavuori N110 | 12.2 gr | 80% | 25,599 psi | 50% | 1578 fps | 98.5% |
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 | 150gr | Barnes TSX FN FB. Hodgdon LilGun delivers the highest muzzle velocity at 1,926 fps; across all powders the maximum-charge window runs from 1,112 fps to 1,926 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 48–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:15.0 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. Accurate No. 11 FS, Vihtavuori N110, ADI AR 2205 rank at the top here: for .300 AAC Blackout with the .308 | 150gr | Barnes TSX FN FB 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.