Probably the greatest appeal of the .300 Blackout—and its best claim to versatility—is the fact it shoots bullets from zippy little 110-grain hunting projectiles at around 2,400 fps, clear up to 220-grain match bullets at a subsonic 1,050 fps. The lighter 110- through 125-grain bullets make reasonably good close-range deer and hog killers, while the heavier bullets can be almost completely silenced through the use of a good suppressor.
The .300 Blackout is a prime choice for extensive, inexpensive handloading. Why? Because it uses standard .223/5.56mm cases, formed in a simple three-step process into .300 Blackout cases.
(1) Cut the .223 cases off just below the shoulder with a Dremel tool, lathe or however you want to do it.
(2) Run the cut-off cases into a standard .300 Blackout sizing die. The die will form the new neck and shoulder.
(3) Trim the formed cases to length (1.368 inches). All that’s left is to knock the burrs off of the inside and outside of the neck and load ’em up!
While you may not need a gun that shoots so silently all you hear is the bolt cycling, every red-blooded shooter wants one. And why not? Such loads are easy on the ears, perfect for popping marauding skunks in the back yard and enable nighttime hog control artists to terminate more hooved roto-rooters.
To get started, you’ll need to fill out the appropriate paperwork, order a .30-caliber suppressor and then twiddle your thumbs while the bureaucrats work out the red tape. You can make the most of the time waiting by loading up a bunch of rounds with 220-grain Sierra MatchKings or 208-grain Hornady A-Max bullets. Better practice giggling so that your stomach lining is conditioned to take it when you finally get the suppressor and turn loose those lovely oversize bullets.
A comparison of cartridges (L.-R.): 7.62x39, .300 Whisper subsonic, .300 BLK supersonic, 5.56x45, 6.5x38 Grendel, 6.8x43 SPC.
Today’s premium .223 and 5.56mm loads get a lot of mileage out of the cartridge, but the .300 Blackout is designed to shoot 125-grain projectiles with energy approaching and even equaling that of the legendary AK-47 cartridge: the 7.63x39mm. The very best .223 loads offer about 1,400 foot-pounds of energy; the .300 Blackout averages that or better and offers the benefits of larger diameter and increased mass—to the tune of about double that of the heaviest .223 projectiles that will feed reliably through a magazine.
Several ammunition companies are producing excellent .300 Blackout loads, but to the tune of $1.50 a pop on average. Handloading can cut your cost to a third of that: Primers run about 4 cents apiece; premium bullets 35 to 40 cents apiece; and powder around 7 cents per shot. Do the math. Luck into a bulk quantity of FMJ bullets at a good price, and you can knock another two bits off per shot.
One detraction from other great recent AR-15 cartridges such as the 6.5 Grendel and 6.8 SPC is—no matter what the propaganda says—they don’t work perfectly through standard M16-type magazines and often need dedicated mags engineered just to feed them. Not so with the .300 Blackout.
Since it’s based on standard 5.56mm and .221 Fireball cases, the Blackout has the same overall length as a 5.56mm cartridge. Also, the critical contours of the bullet’s ogive typically contact the feed ramp of an AR-15 in similar fashion to the 5.56mm, allowing it to cycle beautifully with standard M16 magazines. As a nice little bonus, it also uses the same bolt, gas system—same everything but the barrel. Turning your worn 5.56mm AR-15 into a .300 Blackout is about as easy as a caliber conversion can be.
