Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 165gr | Remington SP Extended-Range BT bullet and 17 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Lovex S053 and IMR 4227.
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>> | 84% | 44,411 psi | 87% | 1847 fps | 99.1% |
| ADI AR 2205 | <<locked>> | 86% | 43,366 psi | 85% | 1772 fps | 99.8% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 39,943 psi | 79% | 1873 fps | 98.4% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 43,105 psi | 85% | 1873 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,297 psi | 56% | 1129 fps | 100% |
| IMR 4227 | <<locked>> | 94% | 44,208 psi | 87% | 1847 fps | 98% |
| Lovex D060 | <<locked>> | 86% | 43,439 psi | 86% | 1841 fps | 96.2% |
| Lovex D063 | <<locked>> | 84% | 44,918 psi | 88% | 1854 fps | 96.6% |
| Lovex S053 | <<locked>> | 96% | 44,396 psi | 87% | 1857 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,441 psi | 54% | 1152 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 44,860 psi | 88% | 1893 fps | 98% |
| Shooters World Blackout | <<locked>> | 84% | 44,918 psi | 88% | 1854 fps | 96.6% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 43,439 psi | 86% | 1841 fps | 96.2% |
| Shooters World SOCOM | <<locked>> | 86% | 43,323 psi | 85% | 1827 fps | 96.9% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 45,905 psi | 90% | 1781 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 45,063 psi | 89% | 1818 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 40,393 psi | 80% | 1854 fps | 99.3% |
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% | 38,754 psi | 76% | 1772 fps | 98.2% |
| ADI AR 2205 | <<locked>> | 80% | 36,216 psi | 71% | 1677 fps | 99.1% |
| ADI AR 2207 | <<locked>> | 90% | 29,907 psi | 59% | 1709 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 98% | 40,625 psi | 80% | 1841 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,639 psi | 41% | 1004 fps | 100% |
| IMR 4227 | 15.9 gr | 84% | 32,895 psi | 65% | 1680 fps | 95% |
| Lovex D060 | <<locked>> | 82% | 39,102 psi | 77% | 1775 fps | 95% |
| Lovex D063 | <<locked>> | 80% | 39,755 psi | 78% | 1785 fps | 95.4% |
| Lovex S053 | 14.8 gr | 80% | 28,123 psi | 55% | 1604 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,117 psi | 40% | 1027 fps | 100% |
| ReloadSwiss RS 36 | 17.7 gr | 88% | 35,259 psi | 69% | 1755 fps | 95.6% |
| Shooters World Blackout | <<locked>> | 80% | 39,755 psi | 78% | 1785 fps | 95.4% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 39,102 psi | 77% | 1775 fps | 95% |
| Shooters World SOCOM | <<locked>> | 82% | 37,855 psi | 75% | 1749 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,137 psi | 53% | 1529 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 33,649 psi | 66% | 1673 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 26,977 psi | 53% | 1627 fps | 95.5% |
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 | 165gr | Remington SP Extended-Range BT. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,893 fps; across all powders the maximum-charge window runs from 1,129 fps to 1,893 fps. ADI AR 2207 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 54–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Alliant Reloder-10x, 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. ReloadSwiss RS 36, Lovex S053, IMR 4227 rank at the top here: for .300 AAC Blackout with the .308 | 165gr | Remington SP Extended-Range BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Alliant Reloder-10x, 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.