In her latest video, Kirsten Joy Weiss shows off the 300 AAC Blackout, a popular .30-caliber cartridge for AR-platform rifles. Kirsten explains the advantages for the 300 BLK for hunters as well as those using an AR for self-defense. The 300 BLK is popular with suppressor owners because it works well with heavy bullets launched at subsonic velocities.
Reasons to Shoot a 300 AAC Blackout:
— You can use your current AR Bolt, Bolt Carrier, Buffer, and Magazine. The only part you need to change is the barrel.
— 300 BLK conforms to state hunting regulations which may require a cartridge larger than .22 Caliber. The 300 BLK shoots .308 caliber bullets.
— Lapua now sells 300 AAC Blackout brass so no case-forming is required. Just load and shoot.
— You can shoot light bullets supersonic or heavier bullets subsonic. The subsonic capabilities of the 300 BLK make it ideal for use with a suppressed AR.
— With a .30-caliber bore and a modest powder charge, barrel life is outstanding with the 300 BLK.
— You can make 300 BLK cartridges from fired .223 Rem brass, which is plentiful and cheap.
— The .300 BLK performs well with some very accurate powders, such as Hodgdon H4198 and IMR 4227.
The 300 AAC Blackout was created by Advanced Armament Corp. and Remington primarily for the military as a way to shoot .30-caliber bullets from the M4/AR15 platform while using standard magazines. As explained by Robert Silvers, AAC’s R&D Director: “Now there is a way to shoot 30 caliber from your AR while still using normal magazines with full capacity. Even the bolt stays the same, and all that changes is the barrel.” For more information visit www.300aacblackout.com and download the 300 BLK Cartridge Information Guide (PDF).
SAAMI, the industry standards organization, adopted and standardized the AAC 300 Blackout in 2010. The SAAMI diagram for the 300 BLK is shown above. Lapua now makes 300 BLK cartridge brass.
300 BLK for 3-Gun Competition
The 300 AAC Blackout has been touted as an important new hunting round, but we see it more as a specialized “rule-beater” 30-cal option that lets 3-Gun competitors “make major” with a low-recoil cartridge that also offers long barrel life. For those who need to run a .30-caliber cartridge from a standard AR15 platform (as opposed to the AR10), the 300 AAC Blackout makes some sense. But for hunters using a bolt gun, there are any number of tried and true options, such as the 7.62×39, .30-30, and, of course, the .308 Winchester (7.62×51 NATO).
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Can you fill a 30-round AR15 magazine in the blink of an eye — less than half a second? Well watch this video to see how it’s done, using the Israeli-designed Maglula Range BenchLoader™. In fairness, it takes about 20 seconds to fill the cleverly-designed device with thirty 5.56x45mm cartridges, but once they’re in place, a quick swipe of the hand is all it takes. Thirty rounds are zipped into the mag in 0.3 seconds (by our stopwatch). Don’t believe us? Watch the video. The magic happens at 0:42 and again at 1:17. Don’t blink — you’ll miss it.
Maglula Benchloaders are rugged CNC-machined tools designed to load 5.56/.223 Rem magazines in a single hand stroke. In the video below, a manufacturer’s rep demonstrates the speedloader, along with the “Lula” lever-action plastic loader/unloader.
Frankly, we prefer using the original straight 10-round and 20-round magazines in our ARs since they extract easier and feed flawlessly. But, if you use 30-round mags for 3-Gun matches or other tactical disciplines, these Benchloaders look like they can really speed up the loading process.
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Planning to put together an AR-platform rifle? Or are you looking to upgrade your AR with a new barrel, stock, or trigger group? Then you should check out the AR-15 Rifle Build DVD from our friends at UltimateReloader.com. This DVD covers all the details of a custom build, using high-resolution video sequences, and helpful supporting graphics.
In this DVD, Gavin Gear guides you through the entire process including selecting components, acquiring and using the necessary tools, assembly steps and details for each component, and even mounting a scope. Building an AR-15 can be overwhelming, but with the right guidance and help it’s not difficult and is a lot of fun. With this DVD you’ll be able to build your AR-15 with confidence.
Right now, as a New Year’s promotion, the AR-15 Build DVD is on sale for just $9.90 (plus $3.80 shipping/handling). This DVD can pay for itself many times over by showing you how to do your own gunsmithing (and get quality AR components at attractive prices).
Tools: AR-15 and general tools required
Upper: Barrel / Gas Block / Gas Tube
Upper: Handguard Installation:
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The AR-10 was designed to handle the 7.62×51/.308 Winchester and other .308 “family” cartridges such as the .243 Win and .260 Remington. Our friend Dennis Santiago recently put together an AR-10 to shoot the accurate .260 Rem cartridge. Here is his initial report:
AR-10 Platform Chambered for .260 Remingtonby Dennis Santiago
I was very curious to see how the .260 works in the AR-10 compared to a .308. I’ve always thought about chambering a bolt gun in .260 but before doing so I thought it’d be good to try it using a less expensive entry point. With an AR platform’s easy interchanging of barrels, it seem like the best way to test out the .260 Rem chambering. So far, it’s most impressive.
DPMS LR-308 in .260 Remington getting function cycle tuned and zeroed
I took the AR-10-type .260 Rem a step closer to being ready for matches yesterday. The first order of business was to confirm which buffer spring to use with both the 123 grain and 140 grain bullet loads. My .260 Rem loads, on average, are using 4-5 grains less powder than the .308 loads. In a semi-automatic action that means less gas/energy to work the mechanics. The solution in an AR-10 platform is to either cut coils in the .308 spring or use a weaker AR-15 buffer spring; yup they are not the same. In this case, a CS flat spring for the AR-15 did the trick.
I also put a very nice NightForce Benchrest 12-42x56mm scope that came via friend Mark Gravitt on it and got zeros. This scope’s 1/8th MOA clicks are nice. The AR-10 had previously mounted a NightForce F1, a more “field tactical” 3-15X system. This 12-42X scope now sets this gun up as more of a target cannon. Field of view is limited when your minimum magnification is twelve. Maybe I’ll put an auxiliary red dot on it just to find the target.
Pet Loads: H4350 and Lapua 123gr Scenars Comment by Daily Bulletin Editor
Over a two-year period, this Editor put a lot of rounds through a .260 Remington. I did a ton of load testing with that Savage-actioned rifle (before it was rebarreled as a 6mmBR Norma). I tried two dozen load recipes with five different powders and bullets ranging from 100 grains to 142 grains. Hodgdon H4350 was my “go-to” powder. As many 260 Rem shooters have discovered, H4350 is a winner in the .260 Rem. This propellant delivered the lowest ES in my rifle and nothing beat H4350 for consistent accuracy with bullets in the 120-140 grain range. My most accurate load was with Lapua 123gr Scenars, pushed by H4350 and CCI 250 primers. The 123gr Scenars worked well jumped as well as seated into the lands. Best accuracy, in my 24″-barreled .260 Rem, was right about 2950 fps. Other powders work well, but H4350 is a very good choice for the .260 Remington (as well as the smaller 6.5×47 Lapua cartridge).
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Can a human being, hand-holding a rifle, out-shoot a mechanical test rest? Who would win in this battle between man and machine? You might just be surprised. At 600 yards, with an AR-platform rifle, the results can be remarkably close, based on targets provided by the USAMU. When clamped in a test rig, a USAMU M16A2 produced a 200-18X group with handloads. The USAMU says this was “one of our better 20-shot groups at 600 yards, testing ammo from a machine rest”. Can a human do better?
Remarkably, a human soldier came very close to matching the group shot from the machine rest. The photo below shows a 20-shot group shot by a USAMU marksman with sling and iron sights, using USAMU-loaded ammunition. The score, 200-16X, was nearly the same. As you can see, the USAMU rifleman didn’t give up much to the machine rest, even at 600 yards!
In fairness, this was no ordinary human performance. The 200-16X score was a new National Record set in December, 1994. This was fired by PFC Coleman in an Interservice Match at Okeechobee, Florida. Nice shootin’ soldier!
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Here’s a simple product that performs a very important function. Magazine Marker Bands from Faxon Firearms help you keep track of your AR- and AK-platform mags. Color-coded and marked with the cartridge type (5.56/.223, 7.62×39, 300 BLK), these bands help ensure you never load the wrong type of ammo into your semi-automatic rifle. Maybe you’re thinking “I’d never make that mistake” but remember Murphy’s law — “Anything that can go wrong, will go wrong.” The consequences of shooting the wrong type of ammunition in a rifle can be dire, if not catastrophic.
In addition to the safety benefits, these color bands also help you organize your magazines during transport and storage. If you have a variety of AR uppers in various calibers, it would be sensible to purchase a set of these color-coded bands. Price is $9.99 per set of ten (10) bands of one color (blue 5.56/.223, yellow 7.62×39, or red 300 BLK). Unfortunately, Faxon does not currently offer a “Mix and Match” option. So, if you want all three types, you’ll have to buy three different sets. That’s a bit annoying.
We’d like to see a marker band product like this for other types of magazines, including rimfire mags. We’ve seen varminters try to stuff a 17 HMR magazine into a 22LR and vice-versa. We’ve also seen shooters pick up the wrong Detachable Box Magazine (DBM) for their centerfire bolt guns. This can easily happen on a varmint hunt when you have multiple rifles in different calibers (such as .223 Rem and .204 Ruger).
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Got fifty bucks? Well that’ll buy you an AR Lower this week. Quite simply, this is the best AR deal we’ve seen this year, and one of the best values on a firearm receiver we can remember. Right now, while supplies last, Brownells.com is offering Bushmaster-brand AR-15 stripped lower receivers for just $49.99. You read that right — you can get a major manufacturer AR lower for under fifty bucks. That’s a savings of $120.00 off the normal price. Get them while you can.
NOTE: Stripped lowers are considered the firearm, so this must be delivered to an FFL-holder. It is fairly easy to complete the lower with readily available parts and the trigger group of your choice.
Bushmaster Stripped Lower Receiver Product Description
Receiver is a rigid 7075 T6 aluminum forging with extra metal in the right places for added strength without unnecessary bulk. Features a beefy, M16A2-pattern reinforced area around the front pivot pin, a strengthening ridge over the receiver extension threads, and a ridge around the mag release button to guard against accidental magazine drop by preventing unintentional button activation. Bead blasted after machining to ensure a uniform, non-reflective surface before application of lusterless black military hardcoat A8625, Type III, Class 2 anodized finish that adds surface strength and resists abrasion. A final, nickel acetate seal coat provides extra protection against corrosion. Stripped lower is the perfect companion for Bushmaster Lower Receiver Parts Kit, available separately
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Sierra Bullets has just added extensive load data for the 300 AAC Blackout (300 BLK) cartridge. Developed for the AR15 platform, the 300 BLK offers AR shooters a large-caliber option in both subsonic and supersonic variants. The 300 BLK can be made from modified .223 Rem brass or necked-up .221 Fireball cases. We like to form our .300 BLK brass by necking-up the excellent Lapua .221 Fireball brass.
Sierra Has 5 Pages of Load Data for the 300 AAC Blackout. Here is one sample page:
Sierra Cartridge Comments: 300 AAC Blackout
The 300 AAC Blackout (300 BLK, or 7.62x35mm) was created by Advanced Armament Corp. and Remington in order to provide the military with a way to shoot .30 caliber bullets from the M4 platform with only a barrel change. It has since become popular for a wide range of uses including hunting and home defense.
The cartridge shares case-head dimensions and body taper with the .223 Remington. Not only does this allow for compatibility with existing magazines and bolts, but it allows reloaders to form 300 BLK brass from the vast supply of 5.56mm or .223 cases. However, since .223/5.56 cases need to be cut-down and reformed, it can be simpler to neck up .221 Fireball brass.
The 300 AAC Blackout is similar to previous wildcats, such as the .30-221 and .300 Fireball, as well as the proprietary 300 Whisper®. However the 300 BLK was the first SAAMI-approved (and standardized) cartridge of this type. Moreover, any company is free to make firearms or ammunition for the 300 BLK.
300 AAC Blackout is popular with hunters, who may not be allowed to legally hunt with .223 in their state, and who prefer .30-caliber bullets for medium-sized game. It provides similar effectiveness to the 7.62×39mm or the slightly more powerful 30-30 cartridges, while working in the more up-to-date AR15 platform. Effective range for hunting is about 100-150 yards.
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TECH TIP by Robert Whitley,AR-X Enterprises LLC
Over the years, while working with various AR-15 cartridges that require a larger bolt-face bolt (i.e. bigger than a 5.56 NATO/.223 Rem bolt-face, like those cartridges that use a 6.8 SPC bolt or the bolt face suitable for the 6.5 Grendel-based cartridges), I have found that there is an increased potential for a certain type of jam if a modification to the standard “Mil-Spec”, square-edged ejector is not made.
The original AR-15 square-edged ejector design was made for a much smaller-diameter bolt face and the smaller diameter 5.56 NATO/.223 Rem case, and it works perfectly in that application. However, as people have adapted the AR-15 platform to shoot bigger cartridges, some parts have been modified to accept the larger cartridges (i.e. bigger bolt-face bolts for the 6.8 SPC and the 6.5 Grendel, and different extractors), yet other parts have been all but ignored. One of these “ignored” parts has been the ejector. Most of the larger-bolt-face AR-15 bolts still use the standard “Mil-Spec”, square-edged 5.56 NATO/.223 Rem. ejector. That’s the problem. But there is a simple, reliable fix!
Chamfering AR Ejector for Improved Reliablity with 6mm, 6.5mm and 6.8mm Cartridges
With the larger bolt face and the larger-diameter AR cases, the old-style “Mil-Spec” ejector can cause infrequent but still annoying jams if the ejector is not modified. The jam can occur when a cartridge case feeds up and out of the right side of the magazine, and as it does so, the back of the case must slide across the bolt face and sideways over top of the ejector if it is to center up to the chamber and feed in. If the side of the case catches on the sharp-edged ejector you can get a jam. (See picture above).
Fortunately there is an easy fix for this. One way is to take the ejector out and spin it in a lathe or cordless drill and machine or grind it and round or chamfer the sharp edge. (See picture of rounded ejector next to square edged ejector).
Quick Fix Alternative — Bevel Your Ejector
Another “quick fix” is to leave the ejector in the bolt and chamfer the sharp edge with something like a Dremel tool. (See picture). This fix is easy to do and permanently resolves this potential feeding jam issue. There are no downsides to this modification if done right and I would recommend this modification for the ejectors in all larger bolt-face AR-15 bolts.
This gunsmithing tip provided by Robert Whitley of AR-X Enterprises LLC, 199 North Broad Street, Doylestown, PA 18901. Phone: (215) 348-8789. Website: 6mmAR.com.
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Forum member Brian V. (aka “Carbide”) wanted a new look for his “modern sporting rifle”. He was tired of looking at black plastic (or FDE, OD green) and aluminum components on his AR15. So he decided to fit wood “furniture” on the rifle. He ordered a wood butt-stock and fore-arm set made by Lucid, but he didn’t like the two-piece fore-arm of the Lucid stock set. He decided he could build something better than the commercially-available, Lucid-made wood fore-arm.
So Brian took his existing AR tubular fore-arm and epoxied a walnut sleeve to it. With a lathe, Brian then turned the walnut sleeve to his desired dimensions: 2.250″ diameter in back and 2.200″ diameter in front, so there’s a little taper. Brian says “I could have gone a little thinner.” The wood fore-end was then sanded and stained to match the Lucid-made rear section. Brian says “the stain is not quite a perfect match, but but it looks a lot better.”
Does Brian like his new wood-stocked AR? Absolutely. He says the conversion makes the gun more user-friendly: “The wood is warmer to carry in winter and quieter.” He adds that the wood sleeve added about four ounces of weight to the fore-end, but that did not affect the handling.
We think this is a good “do-it-yourself” project that could be done by many of our readers. You can simply install the Lucid stock set or customize the front end like Brian did. Either way, you end up with a good-looking rifle that feels better in your hands.
We are already half-way through the NRA High Power National Championship and SSG Shane Barnhart of the USAMU remains atop the leaderboard, with a score of 1193-64X out of a possible 1200 points. Barnhart shot a 595-28X during Sunday’s Navy Cup, Coast Guard Trophy, and Army Cup matches. Barnhart currently holds a three-point lead over second place SSG Brandon Green (1190-58X), the defending High Power National Champion. Like Barnhart, Green shoots for the USAMU. Kenneth Lankford leads the “any sight” (scopes allowed) division with 1191-54X.
High Power Hardware: The Guns of Perry
We thought our readers would like to see some of the ultra-accurate rifles campaigned by High Power competitors at Camp Perry. Both bolt-action and self-loading rifles are popular. Among bolt guns, Tubb 2000s and Eliseo tubeguns are popular. Semi-auto AR platform “Space Guns” offer some advantages (particularly during rapid-fire and for standing position), and are favored by many of the top marksmen. Many Camp Perry High Power competitors are also shooting less exotic AR service rifles.
Here is your current leader, SSG Shane Barnhart, with an AR Space Gun. Note the side charging handle and tall iron sight set-up.
Tubb 2000 with a shortened handguard, and custom hand support bracket forward of mag well.
The modern AR Space Gun, scoped version. Note the side charging handle, and absence of forward assist. A block fitted under the handguard helps with the standing position. The scope is mounted on a “piggy-back” rail that extends forward of upper receiver’s built-in rail.
Tubb 2000 rifle, left-hand version. Note how the butt-plate is adjusted for cant, angle, and drop.
Look carefully — it appears that a separate fore-arm section is duct-taped to the red free-floated handguard. Perhaps this AR owner experienced some wiggle, and that’s why he seems puzzled?
A countdown timer is attached directly to this shooter’s Tubb 2000 rifle.
This Service Rifle competitor shows how to get some “R & R” between relays.
Hate chasing brass ejected from your AR platform rifle? Well here’s a clever new accessory — a brass catcher that mounts easily to the Picatinny rail on top of your upper receiver. There are other types of brass-catching rigs on the market, but this is one of the best products we’ve seen for ARs with Picatinny rails. Caldwell’s AR Pic Rail Brass Catcher mounts easily with a quick-detach aluminum clamp. Both the clamp and wire frame are adjustable so they won’t interfere with your scope or scope mounts.
We like the quick-detach feature. This lets you quickly check and/or clear your chamber, or inspect the bolt. The bag itself, made from heat-resistant mesh fabric, will hold approximately one hundred .223 Rem cartridge cases. And here’s another nice feature — the bag has a zipper on the bottom so you can quickly dump your spent brass without having to remove the brass-catcher from your rifle.
Brass Catcher Features:
– Captures fired casings before they hit the ground.
– Quick-detach system mounts securely — no fumbling with straps.
– Compatible with most Picatinny rail-equipped AR-10s as well.
– Heat-resistant mesh bag holds 100 pieces of brass.
– Fully adjustable — can be placed at any point on Picatinny rail.
If you shoot an AR and reload your own ammo, you should get some kind of brass-catching device. With a $39.19 “street price” ($49.99 MSRP), this is one of the more affordable options. Once you use a rig like this and no longer have to pick up brass from the ground, you may get spoiled. Moreover, a brass-catcher like this will earn you “Brownie Points” with other shooters at your range who no longer have to dodge your hot brass.
Product Tip from EdLongrange. We welcome reader submissions.
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