Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 147gr | Winchester FMJ Match bullet and 13 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Lovex S053, 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>> | 88% | 45,513 psi | 90% | 1969 fps | 98.3% |
| ADI AR 2205 | <<locked>> | 90% | 45,121 psi | 89% | 1903 fps | 99.4% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 35,795 psi | 71% | 1916 fps | 95.8% |
| Hodgdon LilGun | <<locked>> | 84% | 45,832 psi | 90% | 2018 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,325 psi | 54% | 1191 fps | 100% |
| IMR 4227 | <<locked>> | 98% | 45,614 psi | 90% | 1972 fps | 96.9% |
| Lovex S040 | <<locked>> | 82% | 44,135 psi | 87% | 1886 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 45,382 psi | 89% | 1982 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,368 psi | 52% | 1214 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 45,571 psi | 90% | 2011 fps | 96.7% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 41,887 psi | 83% | 1854 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 45,788 psi | 90% | 1949 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 36,347 psi | 72% | 1900 fps | 97.3% |
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% | 35,215 psi | 69% | 1821 fps | 95.9% |
| ADI AR 2205 | 15.7 gr | 80% | 33,417 psi | 66% | 1729 fps | 97.3% |
| ADI AR 2207 | <<locked>> | 98% | 34,214 psi | 67% | 1890 fps | 95.3% |
| Hodgdon LilGun | <<locked>> | 80% | 39,784 psi | 78% | 1942 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,885 psi | 39% | 1063 fps | 100% |
| IMR 4227 | <<locked>> | 94% | 40,306 psi | 79% | 1896 fps | 95.6% |
| Lovex S040 | <<locked>> | 80% | 42,076 psi | 83% | 1860 fps | 100% |
| Lovex S053 | 15.2 gr | 82% | 27,137 psi | 53% | 1683 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,305 psi | 38% | 1083 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 40,466 psi | 80% | 1939 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 24,685 psi | 49% | 1585 fps | 99.7% |
| Vihtavuori N110 | 14.2 gr | 80% | 30,472 psi | 60% | 1729 fps | 99.8% |
| Vihtavuori N120 | <<locked>> | 94% | 30,893 psi | 61% | 1801 fps | 95.4% |
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 | 147gr | Winchester FMJ Match. Hodgdon LilGun delivers the highest muzzle velocity at 2,018 fps; across all powders the maximum-charge window runs from 1,191 fps to 2,018 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 52–90 %, leaving at least 10 % headroom. The 147.0 gr projectile in 0.308" calls for a 1:16.5 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. Lovex S053, Vihtavuori N110, ADI AR 2205 rank at the top here: for .300 AAC Blackout with the .308 | 147gr | Winchester FMJ Match 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.