Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 170gr | Prvi Partizan FSP 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 5744 | <<locked>> | 82% | 44,628 psi | 88% | 1801 fps | 96.4% |
| Accurate No. 11 FS | <<locked>> | 84% | 43,163 psi | 85% | 1778 fps | 98.9% |
| ADI AR 2205 | <<locked>> | 88% | 45,426 psi | 89% | 1745 fps | 99.9% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 39,088 psi | 77% | 1811 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,949 psi | 55% | 1089 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 45,876 psi | 90% | 1814 fps | 98.2% |
| Lovex D060 | <<locked>> | 88% | 45,339 psi | 89% | 1811 fps | 96.5% |
| Lovex D063 | <<locked>> | 84% | 43,787 psi | 86% | 1788 fps | 96.3% |
| Lovex S053 | <<locked>> | 98% | 45,905 psi | 90% | 1821 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,137 psi | 53% | 1112 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 44,019 psi | 87% | 1827 fps | 97.7% |
| Shooters World Blackout | <<locked>> | 84% | 43,787 psi | 86% | 1788 fps | 96.3% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 45,339 psi | 89% | 1811 fps | 96.5% |
| Shooters World SOCOM | <<locked>> | 88% | 45,223 psi | 89% | 1795 fps | 97.1% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 44,266 psi | 87% | 1716 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 43,729 psi | 86% | 1752 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 39,624 psi | 78% | 1791 fps | 99.1% |
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 5744 | <<locked>> | 80% | 41,916 psi | 83% | 1765 fps | 95.7% |
| Accurate No. 11 FS | <<locked>> | 80% | 38,014 psi | 75% | 1709 fps | 98% |
| ADI AR 2205 | <<locked>> | 80% | 35,766 psi | 70% | 1621 fps | 98.9% |
| ADI AR 2207 | <<locked>> | 92% | 30,763 psi | 61% | 1677 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,494 psi | 40% | 971 fps | 100% |
| IMR 4227 | 15.4 gr | 86% | 34,127 psi | 67% | 1650 fps | 95.3% |
| Lovex D060 | <<locked>> | 84% | 40,625 psi | 80% | 1745 fps | 95.3% |
| Lovex D063 | <<locked>> | 82% | 41,075 psi | 81% | 1752 fps | 95.6% |
| Lovex S053 | 14 gr | 80% | 27,412 psi | 54% | 1549 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,001 psi | 39% | 994 fps | 100% |
| ReloadSwiss RS 36 | 16.7 gr | 88% | 34,098 psi | 67% | 1690 fps | 95.1% |
| Shooters World Blackout | <<locked>> | 82% | 41,075 psi | 81% | 1752 fps | 95.6% |
| Shooters World Buffalo Rifle | <<locked>> | 84% | 40,625 psi | 80% | 1745 fps | 95.3% |
| Shooters World SOCOM | <<locked>> | 84% | 39,175 psi | 77% | 1719 fps | 95.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 26,266 psi | 52% | 1473 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 32,634 psi | 64% | 1611 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 26,310 psi | 52% | 1568 fps | 95.1% |
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 | 170gr | Prvi Partizan FSP. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,827 fps; across all powders the maximum-charge window runs from 1,089 fps to 1,827 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 53–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:16.0 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. ReloadSwiss RS 36, Lovex S053, IMR 4227 rank at the top here: for .300 AAC Blackout with the .308 | 170gr | Prvi Partizan FSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 4198, Norma 200 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.