Load Specifications
Load data in caliber 8.6 mm Blackout with .338 | 250gr | Sako Hammerhead bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 1200-R, Winchester 748 and Ramshot Wild Boar.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 54,433 psi | 86% | 1998 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 57,014 psi | 90% | 2087 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 54,839 psi | 87% | 2106 fps | 96.5% |
| Accurate 2230 | <<locked>> | 86% | 55,376 psi | 88% | 2119 fps | 97% |
| Accurate 2460 | <<locked>> | 92% | 55,506 psi | 88% | 2100 fps | 99.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 52,547 psi | 83% | 2087 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 56,376 psi | 89% | 2142 fps | 99.6% |
| Accurate 4064ᴾ | <<locked>> | 100% | 48,733 psi | 77% | 2067 fps | 99.5% |
| Accurate LT-30 | <<locked>> | 88% | 55,230 psi | 88% | 2018 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 55,738 psi | 88% | 2031 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 98% | 55,941 psi | 89% | 2136 fps | 97.5% |
| ADI AR 2207 | <<locked>> | 86% | 56,072 psi | 89% | 2034 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 54,795 psi | 87% | 2103 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 55,550 psi | 88% | 2106 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 96% | 53,679 psi | 85% | 2106 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 56,942 psi | 90% | 2188 fps | 98.4% |
| Alliant Power Pro 2000-MRᴾ | <<locked>> | 100% | 55,245 psi | 88% | 2198 fps | 96% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 48,312 psi | 77% | 2057 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 90% | 53,983 psi | 86% | 2060 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 2113 fps | 96.3% |
| Alliant Reloder-7 | <<locked>> | 84% | 54,099 psi | 86% | 2014 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 53,809 psi | 85% | 2018 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 98% | 55,477 psi | 88% | 2142 fps | 96.2% |
| Bofors RP3ᴾ | <<locked>> | 100% | 48,095 psi | 76% | 2064 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 94% | 54,984 psi | 87% | 2067 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 98% | 57,058 psi | 90% | 2169 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 94% | 55,608 psi | 88% | 2195 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 92% | 56,478 psi | 90% | 2123 fps | 100% |
| Hodgdon H335 | <<locked>> | 90% | 54,230 psi | 86% | 2103 fps | 99.8% |
| Hodgdon H4198 | <<locked>> | 84% | 54,273 psi | 86% | 2018 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 98% | 56,347 psi | 89% | 2146 fps | 98.1% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 53,925 psi | 85% | 2159 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,881 psi | 54% | 1230 fps | 100% |
| Hodgdon VARGET | <<locked>> | 98% | 54,462 psi | 86% | 2106 fps | 97.7% |
| IMR 3031 | <<locked>> | 98% | 54,288 psi | 86% | 2142 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 52,634 psi | 83% | 2073 fps | 96.4% |
| IMR 4198 | <<locked>> | 90% | 55,042 psi | 87% | 2034 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 2139 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 96% | 55,550 psi | 88% | 2106 fps | 98.5% |
| Lovex D073.4 | <<locked>> | 86% | 56,057 psi | 89% | 2110 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 92% | 55,883 psi | 89% | 2110 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 98% | 53,766 psi | 85% | 2119 fps | 99.4% |
| Lovex S053 | <<locked>> | 82% | 56,144 psi | 89% | 1962 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 56,869 psi | 90% | 2087 fps | 97.7% |
| Lovex S062ᴾ | <<locked>> | 100% | 51,532 psi | 82% | 2073 fps | 98% |
| Norma 200 | <<locked>> | 86% | 54,273 psi | 86% | 2044 fps | 100% |
| Norma 201 | <<locked>> | 98% | 54,317 psi | 86% | 2093 fps | 98.4% |
| Norma 202 | <<locked>> | 98% | 54,679 psi | 87% | 2110 fps | 99.8% |
| Norma 203Bᴾ | <<locked>> | 100% | 51,648 psi | 82% | 2103 fps | 96.8% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 52,098 psi | 83% | 2123 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 96% | 54,708 psi | 87% | 2126 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 92% | 53,867 psi | 85% | 2070 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,765 psi | 54% | 1253 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 55,550 psi | 88% | 2103 fps | 99.4% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 55,506 psi | 88% | 2201 fps | 96.9% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 45,861 psi | 73% | 2087 fps | 97.9% |
| Rottweil R 901 | <<locked>> | 96% | 55,579 psi | 88% | 2093 fps | 99.8% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 54,708 psi | 87% | 2093 fps | 98.4% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 44,469 psi | 70% | 2011 fps | 95.8% |
| Shooters World AR Plus | <<locked>> | 86% | 56,057 psi | 89% | 2110 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 98% | 53,766 psi | 85% | 2119 fps | 99.4% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 51,532 psi | 82% | 2073 fps | 98% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 56,159 psi | 89% | 2083 fps | 98.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 56,362 psi | 89% | 1847 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 54,853 psi | 87% | 2106 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 55,143 psi | 87% | 2077 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 98% | 53,940 psi | 85% | 2110 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 54,114 psi | 86% | 2034 fps | 99.7% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 49,893 psi | 79% | 1995 fps | 99.8% |
| Somchem S321 | <<locked>> | 94% | 56,797 psi | 90% | 2139 fps | 98.9% |
| Somchem S335 | <<locked>> | 98% | 55,782 psi | 88% | 2067 fps | 100% |
| Somchem S341 | <<locked>> | 98% | 56,942 psi | 90% | 2136 fps | 97.4% |
| Somchem S355ᴾ | <<locked>> | 100% | 46,079 psi | 73% | 2018 fps | 96% |
| Vihtavuori N120 | <<locked>> | 86% | 56,028 psi | 89% | 1998 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 54,215 psi | 86% | 2024 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 53,592 psi | 85% | 2031 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 52,939 psi | 84% | 2083 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 54,781 psi | 87% | 2090 fps | 99.9% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 44,077 psi | 70% | 1972 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 96% | 56,159 psi | 89% | 2110 fps | 98.6% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 53,229 psi | 84% | 2090 fps | 99.6% |
| Winchester 748 | <<locked>> | 96% | 54,302 psi | 86% | 2142 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 98% | 53,577 psi | 85% | 2119 fps | 97.6% |
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% | 51,039 psi | 81% | 1962 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 34,998 psi | 55% | 1795 fps | 98.9% |
| Accurate 2200 | <<locked>> | 82% | 48,370 psi | 77% | 2021 fps | 95.1% |
| Accurate 2230 | <<locked>> | 82% | 48,385 psi | 77% | 2028 fps | 95.5% |
| Accurate 2460 | <<locked>> | 80% | 37,449 psi | 59% | 1857 fps | 97% |
| Accurate 2495 | <<locked>> | 80% | 27,282 psi | 43% | 1699 fps | 96.9% |
| Accurate 2520 | <<locked>> | 80% | 32,967 psi | 52% | 1808 fps | 95% |
| Accurate 4064 | <<locked>> | 86% | 31,415 psi | 50% | 1795 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 43,569 psi | 69% | 1873 fps | 99.4% |
| Accurate LT-32 | <<locked>> | 80% | 43,947 psi | 70% | 1880 fps | 98.2% |
| ADI AR 2206H | <<locked>> | 92% | 46,514 psi | 74% | 2011 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 46,963 psi | 74% | 1936 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 41,901 psi | 66% | 1939 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 40,973 psi | 65% | 1909 fps | 95.5% |
| Alliant AR-Comp | <<locked>> | 80% | 31,937 psi | 51% | 1808 fps | 99.8% |
| Alliant Power Pro 1200-R | 36.3 gr | 84% | 43,859 psi | 70% | 2011 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 51,793 psi | 82% | 2152 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 42,598 psi | 68% | 1978 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 39,871 psi | 63% | 1877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 49,690 psi | 79% | 2073 fps | 95.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 47,863 psi | 76% | 1942 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 41,901 psi | 66% | 1867 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 51,735 psi | 82% | 2096 fps | 95.3% |
| Bofors RP3 | <<locked>> | 96% | 41,945 psi | 66% | 1978 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 38,508 psi | 61% | 1837 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 86% | 38,276 psi | 61% | 1913 fps | 95.4% |
| Hodgdon CFE223 | <<locked>> | 90% | 48,501 psi | 77% | 2100 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 80% | 38,261 psi | 61% | 1883 fps | 98.4% |
| Hodgdon H335 | <<locked>> | 80% | 38,638 psi | 61% | 1893 fps | 97.5% |
| Hodgdon H4198 | <<locked>> | 80% | 48,008 psi | 76% | 1942 fps | 99.6% |
| Hodgdon H4895 | <<locked>> | 90% | 43,903 psi | 70% | 1982 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 41,742 psi | 66% | 1988 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,860 psi | 39% | 1089 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 42,641 psi | 68% | 1949 fps | 95.1% |
| IMR 3031 | <<locked>> | 80% | 30,618 psi | 49% | 1788 fps | 97% |
| IMR 4064 | <<locked>> | 96% | 46,847 psi | 74% | 1995 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 41,162 psi | 65% | 1867 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 44,628 psi | 71% | 2014 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 86% | 40,973 psi | 65% | 1909 fps | 95.5% |
| Lovex D073.4 | <<locked>> | 80% | 45,832 psi | 73% | 1985 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 80% | 37,144 psi | 59% | 1854 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 84% | 33,779 psi | 54% | 1831 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 52,997 psi | 84% | 1929 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 44,875 psi | 71% | 1932 fps | 95.2% |
| Lovex S062 | <<locked>> | 92% | 40,567 psi | 64% | 1919 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 44,991 psi | 71% | 1932 fps | 100% |
| Norma 201 | <<locked>> | 88% | 40,147 psi | 64% | 1900 fps | 95.4% |
| Norma 202 | <<locked>> | 80% | 31,140 psi | 49% | 1759 fps | 95.1% |
| Norma 203B | <<locked>> | 96% | 45,701 psi | 72% | 2021 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 98% | 48,863 psi | 77% | 2080 fps | 95.7% |
| Ramshot Wild Boar | 41.6 gr | 90% | 45,165 psi | 72% | 2001 fps | 95% |
| Ramshot X-Terminator | <<locked>> | 88% | 47,616 psi | 75% | 1991 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,164 psi | 40% | 1119 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,174 psi | 61% | 1864 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 48,573 psi | 77% | 2110 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 37,884 psi | 60% | 1949 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 34,780 psi | 55% | 1795 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 90% | 40,437 psi | 64% | 1900 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 98% | 41,843 psi | 66% | 1972 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 45,832 psi | 73% | 1985 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,779 psi | 54% | 1831 fps | 95.2% |
| Shooters World Precision | <<locked>> | 92% | 40,567 psi | 64% | 1919 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 42,873 psi | 68% | 1913 fps | 95.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 48,428 psi | 77% | 1768 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 42,221 psi | 67% | 1939 fps | 98.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 40,553 psi | 64% | 1890 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 44,904 psi | 71% | 1988 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,373 psi | 53% | 1739 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 28,674 psi | 45% | 1667 fps | 95.3% |
| Somchem S321 | <<locked>> | 82% | 38,130 psi | 60% | 1883 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 32,634 psi | 52% | 1742 fps | 96.7% |
| Somchem S341 | <<locked>> | 92% | 46,528 psi | 74% | 2005 fps | 95.3% |
| Somchem S355 | <<locked>> | 98% | 43,134 psi | 68% | 1975 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 47,007 psi | 75% | 1903 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 37,956 psi | 60% | 1814 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 80% | 33,228 psi | 53% | 1749 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 80% | 28,239 psi | 45% | 1713 fps | 97.2% |
| Vihtavuori N140 | <<locked>> | 82% | 31,459 psi | 50% | 1752 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 96% | 38,841 psi | 62% | 1893 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 86% | 40,872 psi | 65% | 1906 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 84% | 32,010 psi | 51% | 1775 fps | 95.1% |
| Winchester 748 | 38 gr | 84% | 36,709 psi | 58% | 1886 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 92% | 43,758 psi | 69% | 1988 fps | 95.4% |
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 93 powders for 8.6 mm Blackout loaded with the .338 | 250gr | Sako Hammerhead. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,201 fps; across all powders the maximum-charge window runs from 1,230 fps to 2,201 fps. Accurate 2495 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (435 MPa), the top charges use 52–90 %, 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 2208 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. Alliant Power Pro 1200-R, Winchester 748, Ramshot Wild Boar rank at the top here: for 8.6 mm Blackout with the .338 | 250gr | Sako Hammerhead they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-17, Hodgdon H380, IMR 4166 Enduron 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.