Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 88gr | Inceptor SRR bullet and 4 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, ReloadSwiss RS 14 and Hodgdon TrailBoss.
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 |
|---|---|---|---|---|---|---|
| Hodgdon LilGunᴾ | <<locked>> | 100% | 41,133 psi | 81% | 2536 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 21,277 psi | 42% | 1470 fps | 100% |
| Lovex S040 | <<locked>> | 98% | 44,904 psi | 88% | 2421 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,972 psi | 39% | 1496 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 |
|---|---|---|---|---|---|---|
| Hodgdon LilGun | 18.6 gr | 92% | 31,198 psi | 61% | 2339 fps | 95.1% |
| Hodgdon TrailBoss | 5.3 gr | 80% | 15,258 psi | 30% | 1312 fps | 100% |
| Lovex S040 | <<locked>> | 92% | 37,826 psi | 75% | 2303 fps | 95.6% |
| ReloadSwiss RS 14 | 5.4 gr | 80% | 14,460 psi | 28% | 1335 fps | 100% |
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 6 powders for .300 AAC Blackout loaded with the .308 | 88gr | Inceptor SRR. Hodgdon LilGun delivers the highest muzzle velocity at 2,536 fps; across all powders the maximum-charge window runs from 1,470 fps to 2,536 fps. Hodgdon LilGun gives the best case fill at 100 %, and 6 of the 6 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 39–88 %, leaving at least 12 % headroom. The 88.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Hodgdon LilGun, Hodgdon TrailBoss, 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, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .300 AAC Blackout with the .308 | 88gr | Inceptor SRR they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, SNPE Vectan BA6 1/2, Vihtavuori N110 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.