Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 170gr | Sierra Pro-Hunter bullet and 16 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, 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% | 44,976 psi | 89% | 1759 fps | 98.6% |
| ADI AR 2205 | <<locked>> | 90% | 44,222 psi | 87% | 1690 fps | 99.5% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 35,041 psi | 69% | 1709 fps | 96.3% |
| Hodgdon LilGun | <<locked>> | 84% | 44,266 psi | 87% | 1791 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,079 psi | 53% | 1050 fps | 100% |
| IMR 4227 | <<locked>> | 98% | 44,831 psi | 88% | 1755 fps | 97.2% |
| Lovex D063 | <<locked>> | 88% | 45,905 psi | 90% | 1768 fps | 95.8% |
| Lovex S040 | <<locked>> | 82% | 43,642 psi | 86% | 1680 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 44,556 psi | 88% | 1765 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,223 psi | 52% | 1073 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 44,759 psi | 88% | 1795 fps | 97.1% |
| Shooters World Blackout | <<locked>> | 88% | 45,905 psi | 90% | 1768 fps | 95.8% |
| Shooters World SOCOM | <<locked>> | 90% | 43,990 psi | 87% | 1736 fps | 95.9% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 41,017 psi | 81% | 1647 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 44,454 psi | 88% | 1726 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 35,621 psi | 70% | 1693 fps | 97.6% |
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 | 14.7 gr | 80% | 34,548 psi | 68% | 1621 fps | 96.3% |
| ADI AR 2205 | <<locked>> | 80% | 32,924 psi | 65% | 1542 fps | 97.7% |
| ADI AR 2207 | <<locked>> | 96% | 31,633 psi | 62% | 1654 fps | 95.1% |
| Hodgdon LilGun | <<locked>> | 80% | 38,928 psi | 77% | 1729 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,725 psi | 39% | 935 fps | 100% |
| IMR 4227 | <<locked>> | 92% | 37,478 psi | 74% | 1660 fps | 95.4% |
| Lovex D063 | <<locked>> | 86% | 43,555 psi | 86% | 1739 fps | 95.2% |
| Lovex S040 | <<locked>> | 80% | 41,249 psi | 81% | 1650 fps | 100% |
| Lovex S053 | 13.1 gr | 82% | 26,818 psi | 53% | 1503 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,232 psi | 38% | 958 fps | 100% |
| ReloadSwiss RS 36 | 16.3 gr | 94% | 37,623 psi | 74% | 1703 fps | 95.3% |
| Shooters World Blackout | <<locked>> | 86% | 43,555 psi | 86% | 1739 fps | 95.2% |
| Shooters World SOCOM | <<locked>> | 88% | 41,075 psi | 81% | 1699 fps | 95.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 24,352 psi | 48% | 1411 fps | 99.9% |
| Vihtavuori N110 | <<locked>> | 80% | 29,907 psi | 59% | 1539 fps | 99.9% |
| Vihtavuori N120 | <<locked>> | 92% | 28,543 psi | 56% | 1575 fps | 95.1% |
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 16 powders for .300 AAC Blackout loaded with the .308 | 170gr | Sierra Pro-Hunter. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,795 fps; across all powders the maximum-charge window runs from 1,050 fps to 1,795 fps. ADI AR 2207 gives the best case fill at 100 %, and 16 of the 16 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Hodgdon TrailBoss, Lovex S053 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. ReloadSwiss RS 36, Accurate No. 11 FS, Lovex S053 rank at the top here: for .300 AAC Blackout with the .308 | 170gr | Sierra Pro-Hunter 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.