Load Specifications
Load data in caliber 8.6 mm Blackout with .338 | 250gr | Speer Grand Slam bullet and 68 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Ramshot Wild Boar, Alliant Power Pro 1200-R and Hodgdon H322.
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 1680 | <<locked>> | 84% | 53,330 psi | 86% | 1952 fps | 100% |
| Accurate 2015 | <<locked>> | 98% | 54,723 psi | 88% | 2028 fps | 100% |
| Accurate 2460 | <<locked>> | 94% | 53,243 psi | 86% | 2037 fps | 99.2% |
| Accurate 2495ᴾ | <<locked>> | 100% | 46,108 psi | 74% | 1982 fps | 99.9% |
| Accurate 2520 | <<locked>> | 98% | 53,635 psi | 87% | 2073 fps | 99% |
| Accurate 4064ᴾ | <<locked>> | 100% | 42,830 psi | 69% | 1959 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 90% | 54,085 psi | 87% | 1965 fps | 99.9% |
| Accurate LT-32 | <<locked>> | 90% | 54,592 psi | 88% | 1975 fps | 99.2% |
| ADI AR 2206Hᴾ | <<locked>> | 100% | 53,417 psi | 86% | 2064 fps | 96.3% |
| ADI AR 2207 | <<locked>> | 88% | 54,563 psi | 88% | 1988 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 52,852 psi | 85% | 2044 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 98% | 53,693 psi | 87% | 2044 fps | 97.6% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 54,549 psi | 88% | 2087 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 94% | 54,389 psi | 88% | 2116 fps | 97.3% |
| Alliant Reloder-10x | <<locked>> | 94% | 55,216 psi | 89% | 2037 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 88% | 55,941 psi | 90% | 1998 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 92% | 55,709 psi | 90% | 1998 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 96% | 53,374 psi | 86% | 2005 fps | 98.1% |
| Hodgdon BL-C2ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2103 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 94% | 54,650 psi | 88% | 2067 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 94% | 55,593 psi | 90% | 2083 fps | 99.6% |
| Hodgdon H4198 | <<locked>> | 86% | 53,011 psi | 86% | 1962 fps | 99.7% |
| Hodgdon H4895ᴾ | <<locked>> | 100% | 53,693 psi | 87% | 2073 fps | 97% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 48,617 psi | 78% | 2047 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,315 psi | 54% | 1191 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 52,417 psi | 85% | 2041 fps | 96.6% |
| IMR 3031ᴾ | <<locked>> | 100% | 51,459 psi | 83% | 2077 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 53,388 psi | 86% | 1982 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 53,258 psi | 86% | 1926 fps | 100% |
| IMR 8208 XBR | <<locked>> | 98% | 53,693 psi | 87% | 2044 fps | 97.6% |
| Lovex D073.4 | <<locked>> | 88% | 54,172 psi | 87% | 2051 fps | 99% |
| Lovex D073.5 | <<locked>> | 94% | 53,592 psi | 86% | 2044 fps | 98.4% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 50,937 psi | 82% | 2051 fps | 98.7% |
| Lovex S053 | <<locked>> | 84% | 55,042 psi | 89% | 1916 fps | 100% |
| Lovex S060ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2024 fps | 96.6% |
| Lovex S062ᴾ | <<locked>> | 100% | 46,514 psi | 75% | 1972 fps | 96.3% |
| Norma 200 | <<locked>> | 90% | 55,724 psi | 90% | 2028 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2031 fps | 97.5% |
| Norma 202ᴾ | <<locked>> | 100% | 52,185 psi | 84% | 2044 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 98% | 52,721 psi | 85% | 2060 fps | 96% |
| Ramshot X-Terminator | <<locked>> | 96% | 55,825 psi | 90% | 2051 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,156 psi | 53% | 1217 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 53,142 psi | 86% | 1952 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 94% | 53,795 psi | 87% | 2044 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 98% | 53,316 psi | 86% | 2028 fps | 99.3% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 49,139 psi | 79% | 1985 fps | 96.8% |
| Shooters World AR Plus | <<locked>> | 88% | 54,172 psi | 87% | 2051 fps | 99% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 50,937 psi | 82% | 2051 fps | 98.7% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 46,514 psi | 75% | 1972 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 92% | 54,897 psi | 89% | 2024 fps | 97.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 88% | 55,622 psi | 90% | 1808 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 90% | 53,011 psi | 86% | 2047 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 53,345 psi | 86% | 2018 fps | 100% |
| SNPE Vectan SP 9ᴾ | <<locked>> | 100% | 51,895 psi | 84% | 2044 fps | 95.8% |
| SNPE Vectan Tubal 3000ᴾ | <<locked>> | 100% | 55,753 psi | 90% | 2011 fps | 99.5% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 44,846 psi | 72% | 1896 fps | 99% |
| Somchem S321 | <<locked>> | 96% | 54,578 psi | 88% | 2073 fps | 98% |
| Somchem S335ᴾ | <<locked>> | 100% | 53,940 psi | 87% | 2008 fps | 99.8% |
| Somchem S341ᴾ | <<locked>> | 100% | 54,520 psi | 88% | 2064 fps | 96.2% |
| Vihtavuori N120 | <<locked>> | 88% | 54,578 psi | 88% | 1952 fps | 100% |
| Vihtavuori N130 | <<locked>> | 96% | 55,492 psi | 90% | 2001 fps | 100% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 54,911 psi | 89% | 2008 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 46,963 psi | 76% | 1982 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 49,356 psi | 80% | 1991 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 98% | 54,389 psi | 88% | 2047 fps | 97.8% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 47,688 psi | 77% | 1985 fps | 98.5% |
| Winchester 748ᴾ | <<locked>> | 100% | 55,796 psi | 90% | 2119 fps | 98.7% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 51,184 psi | 83% | 2051 fps | 96.4% |
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 1680 | <<locked>> | 80% | 47,036 psi | 76% | 1880 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 31,575 psi | 51% | 1709 fps | 97.6% |
| Accurate 2460 | <<locked>> | 80% | 33,591 psi | 54% | 1762 fps | 95% |
| Accurate 2495 | <<locked>> | 82% | 25,556 psi | 41% | 1644 fps | 95.5% |
| Accurate 2520 | <<locked>> | 86% | 35,795 psi | 58% | 1831 fps | 95.2% |
| Accurate 4064 | <<locked>> | 90% | 31,299 psi | 50% | 1772 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 40,350 psi | 65% | 1791 fps | 98.5% |
| Accurate LT-32 | <<locked>> | 80% | 40,669 psi | 66% | 1795 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 98% | 50,531 psi | 82% | 2028 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 80% | 42,975 psi | 69% | 1857 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 37,681 psi | 61% | 1841 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 92% | 44,512 psi | 72% | 1926 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 28,834 psi | 47% | 1719 fps | 99% |
| Alliant Power Pro 1200-R | 34.4 gr | 88% | 44,976 psi | 73% | 1991 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,361 psi | 59% | 1795 fps | 99.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 44,063 psi | 71% | 1864 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 38,377 psi | 62% | 1781 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 39,885 psi | 64% | 1824 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 92% | 41,742 psi | 67% | 1936 fps | 95.6% |
| Hodgdon H322 | 31.2 gr | 80% | 34,708 psi | 56% | 1791 fps | 96.8% |
| Hodgdon H335 | <<locked>> | 80% | 34,998 psi | 56% | 1801 fps | 95.7% |
| Hodgdon H4198 | <<locked>> | 80% | 44,425 psi | 72% | 1857 fps | 98.8% |
| Hodgdon H4895 | <<locked>> | 96% | 47,688 psi | 77% | 1998 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 45,672 psi | 74% | 2005 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,453 psi | 39% | 1056 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 46,572 psi | 75% | 1965 fps | 95.2% |
| IMR 3031 | <<locked>> | 82% | 29,298 psi | 47% | 1729 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 37,782 psi | 61% | 1785 fps | 99.9% |
| IMR 4227 | <<locked>> | 80% | 50,227 psi | 81% | 1893 fps | 100% |
| IMR 8208 XBR | <<locked>> | 92% | 44,512 psi | 72% | 1926 fps | 95.7% |
| Lovex D073.4 | <<locked>> | 80% | 41,220 psi | 66% | 1883 fps | 96.7% |
| Lovex D073.5 | <<locked>> | 84% | 38,174 psi | 62% | 1837 fps | 95% |
| Lovex D073.6 | <<locked>> | 90% | 36,521 psi | 59% | 1854 fps | 95.5% |
| Lovex S053 | <<locked>> | 80% | 49,211 psi | 79% | 1857 fps | 100% |
| Lovex S060 | <<locked>> | 96% | 49,284 psi | 79% | 1952 fps | 95.4% |
| Lovex S062 | <<locked>> | 98% | 43,613 psi | 70% | 1929 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 41,046 psi | 66% | 1850 fps | 100% |
| Norma 201 | <<locked>> | 94% | 43,526 psi | 70% | 1916 fps | 95.5% |
| Norma 202 | <<locked>> | 86% | 33,721 psi | 54% | 1778 fps | 95.4% |
| Ramshot Wild Boar | 40 gr | 96% | 49,110 psi | 79% | 2018 fps | 95.2% |
| Ramshot X-Terminator | <<locked>> | 92% | 49,023 psi | 79% | 1969 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,439 psi | 39% | 1083 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 50,212 psi | 81% | 1923 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 36,709 psi | 59% | 1808 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 82% | 33,591 psi | 54% | 1742 fps | 95% |
| Rottweil R 902 | <<locked>> | 96% | 43,569 psi | 70% | 1909 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 41,220 psi | 66% | 1883 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 90% | 36,521 psi | 59% | 1854 fps | 95.5% |
| Shooters World Precision | <<locked>> | 98% | 43,613 psi | 70% | 1929 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 44,846 psi | 72% | 1903 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 45,136 psi | 73% | 1703 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 38,406 psi | 62% | 1847 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 36,666 psi | 59% | 1798 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 98% | 48,733 psi | 79% | 2005 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 34,360 psi | 55% | 1726 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 31,314 psi | 51% | 1690 fps | 95.6% |
| Somchem S321 | <<locked>> | 88% | 42,076 psi | 68% | 1913 fps | 95.4% |
| Somchem S335 | <<locked>> | 82% | 31,473 psi | 51% | 1690 fps | 95.5% |
| Somchem S341 | <<locked>> | 98% | 51,126 psi | 82% | 2024 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 43,076 psi | 69% | 1827 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 34,563 psi | 56% | 1729 fps | 99% |
| Vihtavuori N133 | <<locked>> | 80% | 30,095 psi | 49% | 1663 fps | 96.9% |
| Vihtavuori N135 | <<locked>> | 80% | 25,222 psi | 41% | 1621 fps | 95% |
| Vihtavuori N140 | <<locked>> | 86% | 31,995 psi | 52% | 1736 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 90% | 41,843 psi | 67% | 1886 fps | 95% |
| Vihtavuori N540 | <<locked>> | 90% | 34,708 psi | 56% | 1795 fps | 95.4% |
| Winchester 748 | <<locked>> | 90% | 40,234 psi | 65% | 1913 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 98% | 47,674 psi | 77% | 2005 fps | 95.6% |
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 68 powders for 8.6 mm Blackout loaded with the .338 | 250gr | Speer Grand Slam. Winchester 748 delivers the highest muzzle velocity at 2,119 fps; across all powders the maximum-charge window runs from 1,191 fps to 2,119 fps. Accurate 2495 gives the best case fill at 100 %, and 68 of the 68 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, ADI AR 2206H 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. Ramshot Wild Boar, Alliant Power Pro 1200-R, Hodgdon H322 rank at the top here: for 8.6 mm Blackout with the .338 | 250gr | Speer Grand Slam 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.