Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 150gr | Speer Soft Point bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N110, Accurate No. 11 FS and Lovex S053.
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>> | 88% | 44,121 psi | 87% | 1906 fps | 97.8% |
| ADI AR 2205 | <<locked>> | 90% | 43,598 psi | 86% | 1837 fps | 99.1% |
| Hodgdon LilGun | <<locked>> | 84% | 43,918 psi | 87% | 1955 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,876 psi | 53% | 1155 fps | 100% |
| IMR 4227 | <<locked>> | 98% | 43,569 psi | 86% | 1896 fps | 96.2% |
| Lovex S040 | <<locked>> | 84% | 45,339 psi | 89% | 1857 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 43,250 psi | 85% | 1909 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,976 psi | 51% | 1178 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 43,918 psi | 87% | 1942 fps | 96.1% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 40,016 psi | 79% | 1791 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 43,584 psi | 86% | 1880 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 35,360 psi | 70% | 1837 fps | 96.7% |
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 | 16.2 gr | 80% | 34,200 psi | 67% | 1762 fps | 95.3% |
| ADI AR 2205 | <<locked>> | 80% | 32,764 psi | 65% | 1677 fps | 96.9% |
| Hodgdon LilGun | <<locked>> | 80% | 38,392 psi | 76% | 1883 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,653 psi | 39% | 1030 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 41,481 psi | 82% | 1867 fps | 95.6% |
| Lovex S040 | <<locked>> | 80% | 40,292 psi | 79% | 1795 fps | 100% |
| Lovex S053 | 15.1 gr | 86% | 29,457 psi | 58% | 1693 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,102 psi | 38% | 1053 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 41,205 psi | 81% | 1906 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 23,656 psi | 47% | 1526 fps | 99.5% |
| Vihtavuori N110 | 13.4 gr | 80% | 29,283 psi | 58% | 1670 fps | 99.6% |
| Vihtavuori N120 | <<locked>> | 96% | 31,227 psi | 62% | 1765 fps | 95.2% |
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 12 powders for .300 AAC Blackout loaded with the .308 | 150gr | Speer Soft Point. Hodgdon LilGun delivers the highest muzzle velocity at 1,955 fps; across all powders the maximum-charge window runs from 1,155 fps to 1,955 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 51–89 %, leaving at least 11 % headroom. The 150.0 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. Vihtavuori N110, Accurate No. 11 FS, Lovex S053 rank at the top here: for .300 AAC Blackout with the .308 | 150gr | Speer Soft Point 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.