300 AAC Blackout (7.62 x 35 mm) (300 BLK) 110 gr. Hornady V-Max BC: 0.290 2.050” min OAL; (2.050 - 2.100”) SD: 0.166 Max Start Velocity Press. Load Velocity Press. unit Powder Grains FPS Grains H110 18.8 2259 40600 20 2382 50600 C WIN 296 18.8 2259 40600 20 2382 50600 C IMR4227 17.6 1942 36500 20.0 2220 47600 P 4100-Enfrc 17.4 2182 - 19.3 2362 54472 P Trail Boss 4.5 880 21900 6.3 1046 20200 C 2400 14.1 - - 17.1 - - CFEBLK 22.5 2168 28500 23.7 2303 35900 P 110 gr. Barnes TAC-TX FB BC: 0.289 115 gr. Berger HP Flat Base BC: 0.296 2.100” min OAL; (2.100 - 2.250”) SD: 0.166 2.070” min OAL; (also 2.100”) SD: 0.172 Max Start Velocity Press. Max Velocity Press. unit Start Velocity Press. Load Velocity Press. unit Powder Grains FPS Grains Powder Grains FPS Grains 4100/Enfrc 17.1 2112 - 19.0 2311 54426 P H110 18.8 2220 39300 20 2348 50800 C A5744 17.6 1919 - 19.6 2117 - Lil Gun 18.9 2235 32600 20.5 2393 39900 C IMR4227 16.1 2017 - 17.8 2162 - IMR4227 17.6 1934 36800 19.5 2110 47000 C Lil’Gun 17.5 2206 - 19.4 2349 - 4100/Enfrc 17.2 2072 - 19.1 2246 54500 P H110 18.2 2213 - 20.2 2415 - Trail Boss 4.5 894 23200 6.3 1044 19900 C WIN 296 18.8 2220 39300 20 2348 50800 C CFEBLK 21.2 2004 22400 23.0 2169 28600 P Objectives of the 300 AAC Blackout cartridge: • Create a reliable, compact 30 caliber solution for the modern M4/M-16/AR-15 platform. • Utilize existing magazines, both steel and polymer, while retaining their full capacity. • Create the optimal platform for sound and flash suppressed semi-automatic and full-automatic fire. • Create compatible full power ammunition matching the 7.62x39 ballistics, yet with Accuracy which easily bests that cartridge and rivals 5.56/.223. • Work with subsonic and full power ammunition without requiring adjustable gas blocks, particularly with careful powder selection. • Provide the ability to penetrate barriers with high-mass projectiles. • Provide all capabilities in a lightweight, durable, low recoiling package. The cartridge uses the same bolt, bolt carrier, receiver and standard magazines as for the M4/M-16/AR-15. The only change needed is a different barrel. Further, the 300 BLK will perform reliably using barrels from 8” out to 24” in length without problems. Previous cartridges proved the dimensions and performance, including the proprietary 300 Whisper®, the 300 Fireball and the 300-221. Cartridge cases can be formed from existing .223/5.56 cases, by cutting on a bandsaw, trimming and full-length sizing. Read All NOTES below.
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300 AAC Blackout (7.62 x 35 mm) (300 BLK)
110 gr. Hornady V-Max BC: 0.2902.050” min OAL; (2.050 - 2.100”) SD: 0.166
MaxStart Velocity Press. Load Velocity Press. unit
Powder Grains FPS GrainsH110 18.8 2259 40600 20 2382 50600 CWIN 296 18.8 2259 40600 20 2382 50600 CIMR4227 17.6 1942 36500 20.0 2220 47600 P4100-Enfrc 17.4 2182 - 19.3 2362 54472 PTrail Boss 4.5 880 21900 6.3 1046 20200 C2400 14.1 - - 17.1 - -CFEBLK 22.5 2168 28500 23.7 2303 35900 P
110 gr. Barnes TAC-TX FB BC: 0.289 115 gr. Berger HP Flat Base BC: 0.2962.100” min OAL; (2.100 - 2.250”) SD: 0.166 2.070” min OAL; (also 2.100”) SD: 0.172
MaxStart Velocity Press. Max Velocity Press. unit Start Velocity Press. Load Velocity Press. unit
Powder Grains FPS Grains Powder Grains FPS Grains4100/Enfrc 17.1 2112 - 19.0 2311 54426 P H110 18.8 2220 39300 20 2348 50800 CA5744 17.6 1919 - 19.6 2117 - Lil Gun 18.9 2235 32600 20.5 2393 39900 CIMR4227 16.1 2017 - 17.8 2162 - IMR4227 17.6 1934 36800 19.5 2110 47000 CLil’Gun 17.5 2206 - 19.4 2349 - 4100/Enfrc 17.2 2072 - 19.1 2246 54500 PH110 18.2 2213 - 20.2 2415 - Trail Boss 4.5 894 23200 6.3 1044 19900 C
WIN 296 18.8 2220 39300 20 2348 50800 CCFEBLK 21.2 2004 22400 23.0 2169 28600 P
Objectives of the 300 AAC Blackout cartridge:
• Create a reliable, compact 30 caliber solution for the modern M4/M-16/AR-15 platform.
• Utilize existing magazines, both steel and polymer, while retaining their full capacity.
• Create the optimal platform for sound and flash suppressed semi-automatic and full-automatic fire.
• Create compatible full power ammunition matching the 7.62x39 ballistics, yet with Accuracy which easily bests that cartridge and rivals 5.56/.223.
• Work with subsonic and full power ammunition without requiring adjustable gas blocks, particularly with careful powder selection.
• Provide the ability to penetrate barriers with high-mass projectiles.
• Provide all capabilities in a lightweight, durable, low recoiling package.
The cartridge uses the same bolt, bolt carrier, receiver and standard magazines as for the M4/M-16/AR-15. The only change needed is a different barrel. Further, the 300 BLK will perform reliably using barrels from 8” out to 24” in length without problems.
Previous cartridges proved the dimensions and performance, including the proprietary 300 Whisper®, the 300 Fireball and the 300-221.
Cartridge cases can be formed from existing .223/5.56 cases, by cutting on a bandsaw, trimming and full-length sizing. Read All NOTES below.
300 AAC Blackout (7.62 x 35 mm) (300 BLK)
125 gr. Nosler BT, Speer TNT JHP BC: 0.366 130 gr. Barnes T-TSX BC: 0.3502.075” min OAL; (2.075 - 2.210”) SD: 0.188 2.085” min OAL .030-.070” off lands SD: 0.196
Start Velocity Press. Max Velocity Press. unit Start Velocity Press. Max Velocity Press. unitPowder Grains FPS Grains Powder Grains FPS GrainsH110 16.7 2020 40200 17.8 2118 48800 C H110 17.9 2056 40400 19 2155 48400 CLil Gun 15.7 2045 35900 18 2185 40800 C Lil Gun 18.3 2073 37700 19.5 2213 41900 CIMR4227 16.5 1818 38000 17.7 1965 49800 C IMR4227 18 1902 41900 19.2 2008 47600 C4100-Enfrc 16.5 2048 - 18.4 2224 54680 P 4100-Enfrc 14.4 1808 - 16 1998 54852 PA5744 18.9 1984 - 21 2207 51979 P A5744 16.7 1718 - 18.5 1940 50574 PA1680 19.4 1935 - 21.5 2126 39257 P A1680 17 1704 - 18.9 1923 44632 PCFEBLK 19.0 1866 23700 20.0 1945 26500 P
135 gr. Sierra Jacketed SP BC: 0.390 140 gr. Nosler HPBT BC: 0.3962.090” min OAL SD: 0.203 2.095” min OAL; (2.095 - 2.180”) SD: 0.211
MaxStart Velocity Press. Load Velocity Press. unit Start Velocity Press. Max Velocity Press. unit
Powder Grains FPS Grains Powder Grains FPS GrainsH110 17.3 2010 43100 18.4 2109 51200 C H110 16.4 1951 42200 17.4 2047 49900 CLil Gun 16.5 2050 37800 18 2127 43200 C CFEBLK 18.5 1772 20400 20.0 1938 28600 PIMR4227 17.1 1818 39700 18.2 1960 47600 C IMR4227 16.9 1842 40900 18.2 1981 50500 C4100-Enfrc 15.3 1850 - 17 2010 54715 P Lil’Gun 16.0 2014 40600 17.3 2122 47400 CA5744 17.8 1860 - 19.5 2050 54950 PA1680 19.4 1895 - 21.5 2085 51650 PCFEBLK 20.7 1895 24600 22.5 2090 37000 P
150 gr. Sierra MK, Hornady IB BC: 0.417 155 gr. Sierra Palma HPBT MK BC: 0.4702.125” min OAL SD: 0.226 2.155” min OAL SD: 0.233
Start Velocity Press. Max Velocity Press. unit Start Velocity Press. Max Velocity Press. unitPowder Grains FPS Grains Powder Grains FPS GrainsH110 14.8 1775 38000 16.4 1910 47700 C 4100/Enfrc 14.4 1757 - 16.0 1905 52917 PA5744 17.8 1862 - 19.5 2073 54951 P A5744 16.2 1750 - 18.8 1982 52503 PIMR4227 16.5 1785 41800 17.8 1908 50200 C A1680 18.2 1750 - 20.7 2010 49099 P4100-Enfrc 15.3 1851 - 17 2012 54635 P Lil’Gun 14.8 1900 - 16.2 2000 -A1680 19.4 1895 - 21.6 2086 51553 PLil Gun 15 1785 38000 16.2 1901 47700 CCFEBLK 18.8 1810 26600 20.5 1940 33500 P
300 AAC Blackout (7.62 x 35 mm) (300 BLK)
168gr. Sierra SBT; Hornady BTHP BC: 0.404 175 gr. Sierra HPBT BC: 0.5052.195” min OAL SD: 0.248 2.210” min OAL SD: 0.264
Start Velocity Press. Max Velocity Press. unit Start Velocity Press. Max Velocity Press. unitPowder Grains FPS Grains Powder Grains FPS GrainsA5744 16.7 1695 - 18.5 1895 54120 P H110 14.5 1640 39800 15.3 1718 47600 CA1680 14.3 1300 - 19.7 1840 54268 P A5744 16.5 1679 - 18.4 1868 54992 PRE-7 16.6 1600 18.1 1750 IMR4227 15.7 1639 41400 16.7 1709 48200 CCFEBLK 17.4 1653 25900 20.0 1887 41800 C A1680 17.7 1637 - 19.7 1801 54885 PIMR4227 15.8 1672 41500 17.5 1650 47500 C Lil’Gun 13.5 1681 41800 14.5 1768 47700 CLil Gun 13.8 1737 43300 14.8 1811 47400 C CFEBLK 17.9 1691 30000 19.5 1821 37400 PH110 14.3 1659 38400 15.3 1749 47700 C
180 gr. Speer SP BC: 0.5402.215” min OAL SD: 0.271
Start Vel. Press. Max Velocity Press. unitPowder Grains FPS GrainsIMR4198 15.5 1435 23900 16.5 1557 30900 CA5744A1680H4198H110RE-7
208 gr. Hornady A-Max BC: 0.648 210 gr. Berger BT-LR BC: 0.6252.200” min OAL SD: 0.313 2.205” min OAL SD: 0.320
Start Velocity Press. Max Velocity Press. unit Start Velocity Press. Max Velocity Press. unitPowder Grains FPS Grains Powder Grains FPS GrainsIMR4227 10.5 1010 - 10.5 1010 24500 C A5744 13.6 1382 - 15.1 1552 53587 PA5744 12.5 1280 - 13.9 1455 53750 P sub 11.2 1102 27489 P
sub 11 1092 32850 P A1680 14.4 1403 - 16.0 1582 54216 PA1680 12.6 1100 - 14.4 1458 50200 P sub 11.7 1104 23796 P
sub 10.9 1089 26589 PRE-7 10.5 930 11 1000H4198 10 861 - 11 1052 20200 CH110 10.7 1100 - 13.2 1350 -
NOTE: Data Sources: Hodgdon, Western Powders, Lee Precision, Sierra. A few are from 300BLKTalk.com members.
NOTE: Powders H110 and WIN 296 are Identical; Powders 4100 and Enforcer are Identical.Heavy 200 to 240 gr. bullets may suffer from feed/extraction problems using H110 and/or Lil Gun powders.
Units of Pressure: Copper Units indicated with a ‘C’, while PSI units are indicated with a ‘P’.
Loads in BOLD RED indicate a Compressed Powder Charge.
300 AAC Blackout (7.62 x 35 mm) (300 BLK)
210 gr. Sierra HPBT MK LV-BC: 0.629 220 gr. Sierra HPBT MK LV-BC: 0.6082.205” min OAL SD: 0.331 2.205” min OAL SD: 0.331
Start Velocity Press. Max Velocity Press. unit Start Velocity Press. Max Velocity Press. unitPowder Grains FPS Grains Powder Grains FPS GrainsA5744 12.5 1280 - 13.9 1453 53656 P IMR4227 10.5 1044 28800 C
sub 11.0 1092 32821 P A5744 9.6 1041 36900 11.4 1216 42598 CA1680 12.9 1308 - 14.4 1458 50189 P A1680 10.9 1085 32296 12 1263 40075 P
sub 10.9 1089 26589 P H4198 11 1025 11.5 1068 25600 CH110 9.9 1050 9.9 1085 34500 CCFEBLK 12.1 1060 18200 PRE-7 11.2 1034
230 gr. Berger OTM LV-BC: 0.630 240 gr. Sierra HPBT MK LV-BC: 0.6852.215” min OAL SD: 0.346 2.215” min OAL SD: 0.361
All loads for this bullet weight are subsonicStart Velocity Press. Max Velocity Press. unit Start Velocity Press. Max Velocity Press. unit
Powder Grains FPS Grains Powder Grains FPS GrainsIMR4227 - - 10.2 1065 37100 C IMR4227 10.2 -A5744 10.9 1106 37882 11.7 1219 43574 P A5744 9.2 910 10.0 1045
sub 10.9 1106 37882 P A1680 10.5 -A1680 10.9 1106 33056 12.7 1288 46157 P H4198 9.2 720 10 -
sub 10.7 1086 31584 P RE-7 10.6 -H110 9.5 1085 34500 C H110 9.5 -Li’l Gun 8.7 1077 28900 CCFEBLK 11.3 1045 20000 P
NOTE: Headspace at Lands or Just Off as per Barnes. Barnes also suggests starting the bullet seating 0.050” off the Lands to in a given rifle.Other COALs will be most Accurate Headspaced at the Lands in a given rifle.
Anecdotal evidence of MagPul or Modified magazines work best regarding Feed/Extraction problems. Additional COALs provided based on experience of successful operation.
Heavy 200 to 240 gr. bullets should be seated to proper length for Ogive-Magazine mating, 2.200” OAL or less.
There is evidence that barrel length has minimal influence on muzzle velocity, and that Rifling Twist rate has little influence on chamber pressure.
NOTE: Loads highlighted in Yellow and Orange are not well documented and/or may have feed/extraction problems.
There is also anecdotal evidence that determining high accuracy “velocity nodes” by experimentation in a given rifle may be beneficial.
As with any Published Load Data, USE CAUTION, double-check; Load UP slowly for supersonic, and DOWN slowly for subsonic when experimenting with undocumented loads.
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