Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 115gr | Sierra VarmintKing 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, Lovex S040 and Vihtavuori N110.
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>> | 96% | 44,889 psi | 88% | 2133 fps | 97% |
| Hodgdon LilGun | <<locked>> | 90% | 43,381 psi | 85% | 2274 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,411 psi | 50% | 1336 fps | 100% |
| Lovex S040 | <<locked>> | 88% | 44,266 psi | 87% | 2146 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,743 psi | 49% | 1360 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 34,316 psi | 68% | 1991 fps | 99.8% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 44,512 psi | 88% | 2198 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 |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 90% | 38,058 psi | 75% | 2028 fps | 95.3% |
| Hodgdon LilGun | 17.2 gr | 80% | 30,893 psi | 61% | 2065 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,246 psi | 36% | 1190 fps | 100% |
| Lovex S040 | 14.7 gr | 80% | 34,867 psi | 69% | 1994 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,579 psi | 35% | 1215 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 20,349 psi | 40% | 1683 fps | 95.7% |
| Vihtavuori N110 | 14 gr | 80% | 24,453 psi | 48% | 1838 fps | 96% |
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 11 powders for .300 AAC Blackout loaded with the .308 | 115gr | Sierra VarmintKing. Hodgdon LilGun delivers the highest muzzle velocity at 2,274 fps; across all powders the maximum-charge window runs from 1,336 fps to 2,274 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 11 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 49–89 %, leaving at least 11 % headroom. The 115.0 gr projectile in 0.308" calls for a 1:14.5 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, Lovex S040, Vihtavuori N110 rank at the top here: for .300 AAC Blackout with the .308 | 115gr | Sierra VarmintKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 11 FS, Lovex D063, Lovex S053 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.