Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 180gr | A-Square MONO RN bullet and 20 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, ADI AR 2207 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 1680 | <<locked>> | 94% | 43,482 psi | 86% | 1749 fps | 96% |
| Accurate No. 11 FS | <<locked>> | 82% | 43,453 psi | 86% | 1742 fps | 99.5% |
| ADI AR 2205 | <<locked>> | 86% | 45,324 psi | 89% | 1706 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 42,888 psi | 84% | 1821 fps | 99.4% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 45,542 psi | 90% | 1814 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,645 psi | 56% | 1070 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 39,378 psi | 78% | 1729 fps | 96.1% |
| IMR 4227 | <<locked>> | 92% | 43,787 psi | 86% | 1752 fps | 98.6% |
| Lovex D060 | <<locked>> | 86% | 45,295 psi | 89% | 1775 fps | 97.5% |
| Lovex D063 | <<locked>> | 82% | 44,585 psi | 88% | 1762 fps | 97.5% |
| Lovex S053 | <<locked>> | 94% | 44,135 psi | 87% | 1759 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 39,073 psi | 77% | 1778 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,876 psi | 55% | 1093 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 45,005 psi | 89% | 1801 fps | 98.7% |
| Shooters World Blackout | <<locked>> | 82% | 44,585 psi | 88% | 1762 fps | 97.5% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 45,295 psi | 89% | 1775 fps | 97.5% |
| Shooters World SOCOM | <<locked>> | 86% | 45,179 psi | 89% | 1762 fps | 98.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 45,353 psi | 89% | 1680 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 44,353 psi | 87% | 1713 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 43,236 psi | 85% | 1798 fps | 99.9% |
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 1680 | <<locked>> | 92% | 40,857 psi | 80% | 1719 fps | 95.3% |
| Accurate No. 11 FS | <<locked>> | 80% | 40,828 psi | 80% | 1709 fps | 99.2% |
| ADI AR 2205 | <<locked>> | 80% | 38,247 psi | 75% | 1621 fps | 99.7% |
| ADI AR 2207 | 15.8 gr | 84% | 26,397 psi | 52% | 1558 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 94% | 37,927 psi | 75% | 1713 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,726 psi | 41% | 951 fps | 100% |
| IMR 4198 | <<locked>> | 98% | 37,086 psi | 73% | 1696 fps | 95.3% |
| IMR 4227 | <<locked>> | 80% | 30,835 psi | 61% | 1562 fps | 95.3% |
| Lovex D060 | <<locked>> | 80% | 38,319 psi | 75% | 1677 fps | 95.8% |
| Lovex D063 | <<locked>> | 80% | 41,220 psi | 81% | 1719 fps | 96.7% |
| Lovex S053 | 14.5 gr | 80% | 29,907 psi | 59% | 1555 fps | 98.4% |
| Norma 200 | <<locked>> | 98% | 36,680 psi | 72% | 1745 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,262 psi | 40% | 971 fps | 100% |
| ReloadSwiss RS 36 | 16.1 gr | 82% | 31,067 psi | 61% | 1604 fps | 95.2% |
| Shooters World Blackout | <<locked>> | 80% | 41,220 psi | 81% | 1719 fps | 96.7% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 38,319 psi | 75% | 1677 fps | 95.8% |
| Shooters World SOCOM | <<locked>> | 80% | 36,927 psi | 73% | 1654 fps | 96.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,195 psi | 56% | 1467 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 35,085 psi | 69% | 1601 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 24,076 psi | 47% | 1486 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 26 powders for .300 AAC Blackout loaded with the .308 | 180gr | A-Square MONO RN. ADI AR 2207 delivers the highest muzzle velocity at 1,821 fps; across all powders the maximum-charge window runs from 1,070 fps to 1,821 fps. Accurate LT-30 gives the best case fill at 100 %, and 26 of the 26 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate LT-30, ADI AR 2207, Alliant Reloder-10x 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, ADI AR 2207, Lovex S053 rank at the top here: for .300 AAC Blackout with the .308 | 180gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate LT-30, Alliant Reloder-10x, Baschieri & Pellagri 106 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.