Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 140gr | Lehigh Defense Controlled Chaos 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>> | 90% | 44,048 psi | 87% | 1965 fps | 96.9% |
| ADI AR 2205 | <<locked>> | 92% | 43,801 psi | 86% | 1896 fps | 98.5% |
| Hodgdon LilGun | <<locked>> | 86% | 43,236 psi | 85% | 2018 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,020 psi | 51% | 1184 fps | 100% |
| Lovex S040 | <<locked>> | 86% | 45,542 psi | 90% | 1926 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 40,321 psi | 79% | 1932 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,077 psi | 49% | 1211 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 37,927 psi | 75% | 1827 fps | 100% |
| Vihtavuori N110 | <<locked>> | 98% | 45,571 psi | 90% | 1972 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 | 17.2 gr | 86% | 38,682 psi | 76% | 1886 fps | 95.5% |
| ADI AR 2205 | 14.7 gr | 80% | 30,763 psi | 61% | 1696 fps | 95.1% |
| Hodgdon LilGun | <<locked>> | 80% | 35,186 psi | 69% | 1909 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,913 psi | 37% | 1056 fps | 100% |
| Lovex S040 | <<locked>> | 80% | 38,406 psi | 76% | 1831 fps | 99.9% |
| Lovex S053 | <<locked>> | 90% | 30,618 psi | 60% | 1772 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 18,333 psi | 36% | 1079 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 22,336 psi | 44% | 1552 fps | 98.6% |
| Vihtavuori N110 | 13.2 gr | 80% | 27,050 psi | 53% | 1686 fps | 98.7% |
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 19 powders for .300 AAC Blackout loaded with the .308 | 140gr | Lehigh Defense Controlled Chaos. Hodgdon LilGun delivers the highest muzzle velocity at 2,018 fps; across all powders the maximum-charge window runs from 1,184 fps to 2,018 fps. ADI AR 2207 gives the best case fill at 100 %, and 19 of the 19 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 140.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Hodgdon TrailBoss, IMR 4227 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 | 140gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 5744, ADI AR 2207, IMR 4227 burn incompletely and react more sensitively to barrel length and temperature. 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.