Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 167gr | TWENTY-NINE SILENTIO bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, ADI AR 2205 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.
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Max Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 94% | 44,498 psi | 88% | 1680 fps | 96.7% |
| ADI AR 2205 | <<locked>> | 96% | 45,484 psi | 90% | 1634 fps | 98.5% |
| Hodgdon LilGun | <<locked>> | 90% | 43,294 psi | 85% | 1732 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,382 psi | 50% | 988 fps | 100% |
| Lovex S040 | <<locked>> | 88% | 44,541 psi | 88% | 1627 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 36,085 psi | 71% | 1598 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,511 psi | 48% | 1010 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 33,939 psi | 67% | 1516 fps | 100% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 43,076 psi | 85% | 1657 fps | 100% |
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>> | 90% | 39,233 psi | 77% | 1617 fps | 95.5% |
| ADI AR 2205 | 11.8 gr | 84% | 31,923 psi | 63% | 1463 fps | 95.4% |
| Hodgdon LilGun | 12.3 gr | 80% | 31,009 psi | 61% | 1581 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,434 psi | 36% | 879 fps | 100% |
| Lovex S040 | 10.5 gr | 80% | 34,998 psi | 69% | 1516 fps | 99.5% |
| Lovex S053 | <<locked>> | 94% | 30,501 psi | 60% | 1512 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,927 psi | 35% | 902 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 20,407 psi | 40% | 1286 fps | 97.8% |
| Vihtavuori N110 | <<locked>> | 80% | 24,482 psi | 48% | 1398 fps | 98% |
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 9 powders for .300 AAC Blackout loaded with the .308 | 167gr | TWENTY-NINE SILENTIO. Hodgdon LilGun delivers the highest muzzle velocity at 1,732 fps; across all powders the maximum-charge window runs from 988 fps to 1,732 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 9 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. The 167.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, Lovex S053, ReloadSwiss RS 14 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, ADI AR 2205, Lovex S040 rank at the top here: for .300 AAC Blackout with the .308 | 167gr | TWENTY-NINE SILENTIO 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.