Load Specifications
Load data in caliber .300 AAC Blackout with .308 | 150gr | RWS TMR bullet and 16 powders. The key underlying parameters are shown in the table above.
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>> | 86% | 44,237 psi | 87% | 1946 fps | 98.4% |
| ADI AR 2205 | <<locked>> | 88% | 43,743 psi | 86% | 1877 fps | 99.5% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 37,594 psi | 74% | 1939 fps | 96.9% |
| Hodgdon LilGun | <<locked>> | 82% | 44,889 psi | 88% | 1995 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,311 psi | 54% | 1184 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 44,266 psi | 87% | 1946 fps | 97.1% |
| Lovex D063 | <<locked>> | 86% | 45,585 psi | 90% | 1962 fps | 95.7% |
| Lovex S040 | <<locked>> | 82% | 45,774 psi | 90% | 1896 fps | 100% |
| Lovex S053 | <<locked>> | 98% | 44,295 psi | 87% | 1959 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,948 psi | 53% | 1217 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 44,976 psi | 89% | 1995 fps | 97.1% |
| Shooters World Blackout | <<locked>> | 86% | 45,585 psi | 90% | 1962 fps | 95.7% |
| Shooters World SOCOM | <<locked>> | 88% | 43,859 psi | 86% | 1929 fps | 95.9% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 43,366 psi | 85% | 1860 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 44,657 psi | 88% | 1923 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 38,159 psi | 75% | 1923 fps | 98.2% |
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 80% | 36,579 psi | 72% | 1834 fps | 96.8% |
| ADI AR 2205 | <<locked>> | 80% | 34,592 psi | 68% | 1742 fps | 98% |
| ADI AR 2207 | <<locked>> | 96% | 33,402 psi | 66% | 1867 fps | 95.6% |
| Hodgdon LilGun | <<locked>> | 80% | 41,524 psi | 82% | 1952 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,001 psi | 39% | 1056 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 37,478 psi | 74% | 1847 fps | 95.3% |
| Lovex D063 | <<locked>> | 84% | 42,989 psi | 85% | 1929 fps | 95% |
| Lovex S040 | <<locked>> | 80% | 43,062 psi | 85% | 1864 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 26,672 psi | 53% | 1663 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,450 psi | 38% | 1079 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 37,710 psi | 74% | 1890 fps | 95.2% |
| Shooters World Blackout | <<locked>> | 84% | 42,989 psi | 85% | 1929 fps | 95% |
| Shooters World SOCOM | <<locked>> | 86% | 40,814 psi | 80% | 1886 fps | 95.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 25,527 psi | 50% | 1591 fps | 99.9% |
| Vihtavuori N110 | <<locked>> | 80% | 31,473 psi | 62% | 1736 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 30,211 psi | 60% | 1781 fps | 95.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 23 powders for .300 AAC Blackout loaded with the .308 | 150gr | RWS TMR. Hodgdon LilGun delivers the highest muzzle velocity at 1,995 fps; across all powders the maximum-charge window runs from 1,184 fps to 1,995 fps. ADI AR 2207 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (350 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Alliant Reloder-7, Hodgdon TrailBoss 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. As outliers, Accurate 1680, Alliant Reloder-7, IMR 4198 burn incompletely and react more sensitively to barrel length and temperature. 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.