Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 152gr | Remington SP Extended-Range bullet and 14 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>> | 86% | 44,048 psi | 87% | 1919 fps | 98.4% |
| ADI AR 2205 | <<locked>> | 88% | 43,482 psi | 86% | 1850 fps | 99.4% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 36,927 psi | 73% | 1906 fps | 96.7% |
| Hodgdon LilGun | <<locked>> | 82% | 43,729 psi | 86% | 1959 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,601 psi | 54% | 1175 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 44,034 psi | 87% | 1919 fps | 97% |
| Lovex S040 | <<locked>> | 82% | 45,179 psi | 89% | 1867 fps | 100% |
| Lovex S053 | <<locked>> | 98% | 44,048 psi | 87% | 1932 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,672 psi | 53% | 1198 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 44,280 psi | 87% | 1962 fps | 96.9% |
| Shooters World SOCOM | <<locked>> | 90% | 45,905 psi | 90% | 1932 fps | 96.3% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 43,033 psi | 85% | 1834 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 44,135 psi | 87% | 1893 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 37,463 psi | 74% | 1886 fps | 98% |
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% | 36,216 psi | 71% | 1804 fps | 96.7% |
| ADI AR 2205 | 15.7 gr | 80% | 34,200 psi | 67% | 1716 fps | 97.9% |
| ADI AR 2207 | <<locked>> | 96% | 33,272 psi | 66% | 1841 fps | 95.5% |
| Hodgdon LilGun | <<locked>> | 80% | 41,118 psi | 81% | 1926 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,102 psi | 40% | 1043 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 36,622 psi | 72% | 1811 fps | 95% |
| Lovex S040 | <<locked>> | 80% | 43,076 psi | 85% | 1841 fps | 100% |
| Lovex S053 | 14.8 gr | 80% | 26,223 psi | 52% | 1634 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,537 psi | 38% | 1066 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 39,305 psi | 77% | 1893 fps | 95.7% |
| Shooters World SOCOM | <<locked>> | 86% | 40,654 psi | 80% | 1860 fps | 95% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 25,382 psi | 50% | 1568 fps | 99.9% |
| Vihtavuori N110 | 14.2 gr | 80% | 31,372 psi | 62% | 1713 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 30,023 psi | 59% | 1755 fps | 95.6% |
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 23 powders for .300 AAC Blackout loaded with the .308 | 152gr | Remington SP Extended-Range. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,962 fps; across all powders the maximum-charge window runs from 1,175 fps to 1,962 fps. ADI AR 2207 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 152.0 gr projectile in 0.308" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Alliant Reloder-7, Hodgdon TrailBoss 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 | 152gr | Remington SP Extended-Range they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Alliant Reloder-7, IMR 4198 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.