Load Specifications
Load data in caliber .300 AAC Blackout with .311 | 123gr | Lapua 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 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 |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 98% | 44,860 psi | 88% | 1991 fps | 96.5% |
| Hodgdon LilGun | <<locked>> | 94% | 45,150 psi | 89% | 2159 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 24,033 psi | 47% | 1220 fps | 100% |
| Lovex S040 | <<locked>> | 90% | 44,121 psi | 87% | 2001 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 22,974 psi | 45% | 1247 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 31,372 psi | 62% | 1824 fps | 99.4% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 39,639 psi | 78% | 1998 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 | 16 gr | 94% | 39,726 psi | 78% | 1919 fps | 95.2% |
| Hodgdon LilGun | 14.9 gr | 80% | 27,949 psi | 55% | 1880 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 17,419 psi | 34% | 1089 fps | 100% |
| Lovex S040 | <<locked>> | 80% | 32,909 psi | 65% | 1831 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 16,795 psi | 33% | 1112 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 20,711 psi | 41% | 1588 fps | 95.5% |
| Vihtavuori N110 | 12.6 gr | 82% | 23,815 psi | 47% | 1706 fps | 95.3% |
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 .311 | 123gr | Lapua FMJ. Hodgdon LilGun delivers the highest muzzle velocity at 2,159 fps; across all powders the maximum-charge window runs from 1,220 fps to 2,159 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 45–89 %, leaving at least 11 % headroom. 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, ADI AR 2205 rank at the top here: for .300 AAC Blackout with the .311 | 123gr | Lapua 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.