Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 150gr | Swift A-Frame 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, Lovex S053 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>> | 88% | 45,078 psi | 89% | 1929 fps | 98.2% |
| ADI AR 2205 | <<locked>> | 90% | 44,483 psi | 88% | 1860 fps | 99.3% |
| Hodgdon LilGun | <<locked>> | 84% | 45,034 psi | 89% | 1975 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,803 psi | 53% | 1158 fps | 100% |
| IMR 4227 | <<locked>> | 98% | 44,425 psi | 88% | 1919 fps | 96.6% |
| Lovex S040 | <<locked>> | 82% | 43,613 psi | 86% | 1847 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 44,164 psi | 87% | 1932 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,440 psi | 52% | 1191 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 45,411 psi | 89% | 1972 fps | 96.6% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 41,046 psi | 81% | 1811 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 44,802 psi | 88% | 1903 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 36,027 psi | 71% | 1860 fps | 97.1% |
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>> | 80% | 34,548 psi | 68% | 1775 fps | 95.6% |
| ADI AR 2205 | 15.2 gr | 80% | 33,098 psi | 65% | 1693 fps | 97.2% |
| Hodgdon LilGun | <<locked>> | 80% | 38,870 psi | 77% | 1900 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,711 psi | 39% | 1037 fps | 100% |
| IMR 4227 | <<locked>> | 94% | 39,697 psi | 78% | 1854 fps | 95.4% |
| Lovex S040 | <<locked>> | 80% | 41,539 psi | 82% | 1821 fps | 100% |
| Lovex S053 | 15.1 gr | 84% | 28,514 psi | 56% | 1683 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,160 psi | 38% | 1060 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 40,089 psi | 79% | 1900 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 24,178 psi | 48% | 1545 fps | 99.7% |
| Vihtavuori N110 | 13.7 gr | 80% | 29,921 psi | 59% | 1690 fps | 99.8% |
| Vihtavuori N120 | <<locked>> | 94% | 30,487 psi | 60% | 1762 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 21 powders for .300 AAC Blackout loaded with the .308 | 150gr | Swift A-Frame. Hodgdon LilGun delivers the highest muzzle velocity at 1,975 fps; across all powders the maximum-charge window runs from 1,158 fps to 1,975 fps. Accurate 1680 gives the best case fill at 100 %, and 21 of the 21 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 52–89 %, 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. Accurate 1680, ADI AR 2207, Alliant Reloder-7 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, Lovex S053, ADI AR 2205 rank at the top here: for .300 AAC Blackout with the .308 | 150gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Accurate 5744, Alliant Reloder-7 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.