Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 123gr | Prvi Partizan FMJ bullet and 7 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, Vihtavuori N110 and Lovex S040.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 98% | 44,614 psi | 88% | 1985 fps | 96.4% |
| Hodgdon LilGun | <<locked>> | 94% | 44,701 psi | 88% | 2152 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 24,149 psi | 48% | 1224 fps | 100% |
| Lovex S040 | <<locked>> | 90% | 43,656 psi | 86% | 1995 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 23,105 psi | 46% | 1247 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 31,140 psi | 61% | 1818 fps | 99.3% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 39,218 psi | 77% | 1991 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 94% | 39,465 psi | 78% | 1913 fps | 95.1% |
| Hodgdon LilGun | 14.8 gr | 80% | 27,586 psi | 54% | 1873 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 17,521 psi | 35% | 1089 fps | 100% |
| Lovex S040 | 12.7 gr | 80% | 32,518 psi | 64% | 1821 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 16,897 psi | 33% | 1112 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 20,856 psi | 41% | 1588 fps | 95.6% |
| Vihtavuori N110 | 12.5 gr | 82% | 23,540 psi | 46% | 1696 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 7 powders for .300 AAC Blackout loaded with the .308 | 123gr | Prvi Partizan FMJ. Hodgdon LilGun delivers the highest muzzle velocity at 2,152 fps; across all powders the maximum-charge window runs from 1,224 fps to 2,152 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 7 of the 7 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 46–88 %, leaving at least 12 % headroom. The 123.0 gr projectile in 0.308" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, SNPE Vectan BA6 1/2 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. Hodgdon LilGun, Vihtavuori N110, Lovex S040 rank at the top here: for .300 AAC Blackout with the .308 | 123gr | Prvi Partizan FMJ they combine a high case fill with complete burn and sit in the upper velocity band. 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.