August 16th, 2019

Scary Stuff — .300 Blackout Fired in a .223 Rem Barrel

.300 AAC Blackout 300 BLK kaboom accident blowup cartridge failure barrel .223 Rem 5.56
Photos and Facebook post by Tactical Rifle Shooters

Yet another .300 Blackout disaster. Unfortunately, that .300 Blackout cartridge can fit in a .223 Rem chamber. Shooting a .308-caliber bullet in .223 bore is a recipe for disaster.

.300 AAC Blackout 300 BLK kaboom accident blowup cartridge failure barrel .223 Rem 5.56

.300 AAC Blackout 300 BLK kaboom accident blowup cartridge failure barrel .223 Rem 5.56The .300 AAC Blackout aka “300 BLK”, is a compact 30-caliber cartridge designed to work in AR-15 rifles. It has a shorter cartridge case to accommodate the bigger 30-caliber bullet while still fitting in a standard AR-15 magazine. Unfortunately, that’s the danger. A careless shooter can toss a .300 Blackout cartridge in with .223 Rem rounds without noting. And because the case-head size is the same as the .223 Rem (5.56×45) the rifle’s bolt assembly will happily chamber and fire the .300 BLK round. Problem is, that forces a .308 diameter bullet down an undersized .223-caliber bore. Not good!

This images were provided by Tactical Rifle Shooters on Facebook. The message was clear: “Don’t try to run 300 Blackout in your .223/5.56mm. It won’t end well. The problem is identical rifles and identical magazines but different calibers.”

For those who MUST have a .300 Blackout, here are some things you can do:

1. Use different colored magazines for .300 Blackout vs. .223 Rem.
2. Fit all your uppers with caliber-labeled ejection port covers.
3. Mark .223 Rem upper handguards with the caliber in bright paint.
4. Mark all .300 BLK Rounds with heavy black marker.

.300 AAC Blackout 300 BLK kaboom accident blowup cartridge failure barrel .223 Rem 5.56

Comments by Folks Who Viewed these .300 Blackout Disaster Photos:

“The .300 Blackout is simply a badly-designed round. A properly-designed round would have had a feature in the shape that would have prevented cross loading in the first place.” — D. Santiago

“I almost made that mistake… I had a magazine of 300 BLK inserted in my .223/5.56 all night. Fortunately, I never pulled the trigger. Once I realized the mistake, I almost got ill. [After that incident] I no longer own a 300 BLK.” — B. Welch

“Happened to me hog hunting from a helo. Gun exploded in my face.” — B. Hood

“Fire-forming projectiles [is] so wrong in centerfire!” — M. Stres

“Had some dude come into the store the other day wanting .300 Blackout ammo to shoot in his 5.56 AR. It took 15 minutes of explaining for him to understand you got to have a .300 Blackout Upper!” — R. Williams

Permalink Bullets, Brass, Ammo, News, Tech Tip 18 Comments »
December 4th, 2014

New Lapua Brass for 2015: 300 BLK, 7mm-08, 8x57mm JS

Every year we anxiously await the new product announcement from Lapua. In 2014, Lapua brought out new bullets and new cartridge brass — .221 Fireball and .50 BMG. For 2015, Lapua once again brings out new brass offerings, this time three new flavors of cartridge brass, all made to Lapua’s exacting standards. First, Lapua will introduce factory 300 AAC Blackout (300 BLK) brass. This promises to take this highly-efficient, AR-friendly .30-caliber cartridge to another accuracy level. Second, Lapua will offer premium brass for the 7mm-08 cartridge, a very popular round among hunters and silhouette shooters. Lastly, in 2015, Lapua will produce 8x57mm JS brass. That’s good news for fans of this classic Mauser cartridge.

Lapua 2015 cartridge brass casing 300 blackout blk 7-08 7mm-08 Remington 8x57mm JS 8x57

300 AAC Blackout Brass

Lapua’s Press release states: “Few cartridges have generated as much immediate interest as the 300 Blackout. Standardized by AAC, this diminutive cartridge is derived from the 223 Remington. Intended specifically for use in suppressed firearms, the versatility of the Blackout has appealed to a much broader range of shooters than just the audience for which it was originally designed. [Originally] intended to drive 220 grain bullets at subsonic velocities, the switch to lightweight bullets such as the 125 grain offerings delivers performance very similar to the venerable 7.62×39 cartridge. This makes the 300 Blackout potent enough for a wide range of shooting tasks, from certain tactical applications to many short range hunting situations involving medium-sized game. The ability for many 5.56mm/223 systems to be switched over to the 300 Blackout, merely by changing barrels, makes this an incredibly versatile combination. Lapua brings over nine decades of case manufacturing knowledge, precision and quality to the new Blackout, assuring the shooter of the very best performance.”

Lapua 2015 cartridge brass casing 300 blackout blk 7-08 7mm-08 Remington 8x57mm JS 8x57

7mm-08 Remington Brass

Lapua 2015 cartridge brass casing 300 blackout blk 7-08 7mm-08 Remington 8x57mm JS 8x57Lapua notes that it’s new 7mm-08 brass is made to very high standards, benefiting hunters as well as competitors: “The 7mm-08 came to dominate the High Power Silhouette rifle game shortly after its introduction, offering a superb combination of power, light recoil and accuracy. Since then, it has also been used to win National Championships in High Power competition, and become a staple for hunters as well. With ballistic performance exceeding that of the time honored 7x57mm Mauser, but suited to a shorter action, the 7mm-08 is an ideal cartridge for most big game hunting. Lapua brings… state-of-the-art manufacturing methods, combined with old world craftsmanship, to the production of these cases. Primer pockets and flash holes are held to strict tolerances to withstand repeated firings and reloadings. After final necking of the case, they are finished with the proper anneal [for] accuracy and durability.” Lapua also notes that it offers two new 7mm Scenar bullets, which will work very well in the new 7mm-08 cartridge brass.

8x57mm JS Brass

Last but not least, Lapua is producing 8x57mm JS brass. Lapua notes that: “When the 8x57mm JS cartridge was introduced in 1905, its innovative use of a high velocity and relatively light weight pointed bullet design revolutionized infantry combat. An outgrowth on the original 8x57J military round, the 8x57mm JS round served the German military in both world wars, and became a popular sporting cartridge in any area where there was a strong German influence. From African plains game to European stag and boar, the 8mm Mauser has earned an enviable reputation as a big game round in a wide array of conditions. Accurate, versatile and powerful, the 8x57mm JS still serves the sporting community well for a host of hunting applications. In answer to the requests of the many devotees of this fine cartridge, Lapua is pleased to announce our introduction of the new 8x57mmJS case. The new 8x57mmJS will deliver the same accurate, reliable performance for which Lapua cases are world renowned. This means tough, durable cases that will not only withstand repeated loadings, but retain their accuracy shot after shot. [Lapua’s 8x57mm JS brass offers] very tight tolerances in neck wall concentricity and overall uniformity.”

Lapua 2015 cartridge brass casing 300 blackout blk 7-08 7mm-08 Remington 8x57mm JS 8x57

See Lapua’s New Products at SHOT Show 2015
If you plan to attend SHOT Show in Las Vegas, stop by and visit the Lapua Exhibit (booth #11929). With luck, samples of the new 7mm-08, 300 BLK, and 8×57 JS brass will be available to view. Lapua engineers will be on hand to talk about Lapua brass and bullets, and explain the production processes that make Lapua brass so durable and consistent. In recent years, in the world of centerfire competition, Lapua brass has absolutely dominated the winner’s circles as well as the record-books.

Permalink Bullets, Brass, Ammo, New Product 16 Comments »
December 30th, 2013

New 30 ARX — 6.5 Grendel Necked to .30 Caliber Beats 300 BLK

Robert Whitley 30 ARX ar15 6.5 grendelRobert Whitley of AR-X Enterprises has a new .30-caliber cartridge for AR-platform rifles. The new 30 ARX is based on the 6.5 Grendel parent case necked-up to .30 caliber. The 30 ARX mag-feeds flawlessly in an AR15, while offering excellent accuracy, good velocity, and serious knock-down power. Compared to a 300 AAC Blackout (300 BLK), the new 30 ARX holds much more powder so it can push bullets faster and harder. Whitley’s 30 ARX boasts 57% more case capacity than a 300 Blackout. As a result, the 30 ARX outperforms the 300 BLK by a large margin. In a 20″-barreled AR, the 30 ARX can drive a 125gr bullet at 2500+ fps, or launch a heavier 150gr bullet at 2400+ fps:

30 ARX Loads
H4198, CCI BR4 Primers,
Necked-up Lapua 6.5 Grendel Brass:

2419 FPS: 28.0 gr. H4198, Nosler 125gr Ballistic Tip Hunting Bullet (2.260″ OAL)
2517 FPS: 29.0 gr. H4198, Nosler 125gr Ballistic Tip Hunting Bullet (2.260″ OAL)
2363 FPS: 28.0 gr. H4198, Sierra 150gr BT Hunting Bullet (2.240″ OAL)
2441 FPS: 29.0 gr. H4198, Sierra 150gr BT Hunting Bullet (2.240″ OAL)

Robert Whitley 30 ARX ar15 6.5 grendel

Robert Whitley explains the advantanges of the 30 ARX for AR-platform rifles: “The 30 ARX is a cartridge designed from the get-go for use in an AR-15. The case length and chamber design of the 30 ARX are optimal. The case allows the use of many of the favorite .30-cal bullets, magazine fed out of an AR-15 and backed by some real power. Brass is easy to make with a simple necking-up process. Neck it up, load it and go shoot. Good 6.5 Grendel brass is readily available, and we have 30 ARX dies available.”

Watch One-Step Process for Forming 30 ARX Case from 6.5 Grendel Brass

With the ability of Lapua 6.5 Grendel brass to handle stout loads, the 30 ARX cartridge delivers 30-30 Winchester-class performance, from the modern, semi-auto AR-15 platform. The 30 ARX cartridge has sufficient case capacity to push popular .30-cal bullets fast and accurately even at moderate chamber pressures. The case has approximately 38 grains water capacity. With its 57% greater capacity than a 300 Blackout, the 30 ARX is a more versatile, more powerful hunting cartridge (at least when loaded to supersonic speeds). With 150gr bullets running in the 2500 fps range, the 30 ARX offers impressive knockdown power in a cartridge that fits an AR-15 magazine.

  • 30 ARX Cartridge OAL mag-feeds perfectly with a variety of .30-cal bullets.
  • Longer, heavier long-range bullets (with longer COAL) can be single-loaded.
  • Lapua 6.5 Grendel brass is excellent, strong brass, that is readily available.
  • AR-X Enterprises now offers die sets for the 30 ARX.
  • The neck up process is very easy. Simply lube the inside of the necks of 6.5 Grendel brass, run the brass through your re-size die (with .30 Cal expander in place).
  • Works well with a lot of commonly available powders such as: Hodgdon 4198, Vihtavouri N130, Accurate LT-32, Accurate AA1680.
Permalink Bullets, Brass, Ammo, New Product 39 Comments »
December 14th, 2013

Lapua 2014 News — .221 Fireball and .50 BMG Brass, 7mm Bullets

Lapua just dropped a bombshell — multiple bombshells, in fact. Lapua just announced that it will be producing .221 Fireball brass and .50 BMG brass starting early 2014. This will be the first truly match-grade brass ever offered for the .221 Fireball. That’s great news for varminters, who can use Lapua’s new .221 Fireball brass “as is” or neck it down to .20 Vartarg or 17 Fireball. Tactical shooters can also use the .221 Fireball brass to make the .300 Whisper and 300 Blackout sub-sonic cartridges. At the other end of the spectrum, ultra-long-range shooters now have a new ultra-premium brass source for the mighty .50 BMG. This is potentially a “game-changer” for fifty-cal shooters who have had to “make do” with military surplus brass for the most part. Lapua says the new brass, both .50 BMG and .221 Fireball, should be in the USA by early April, 2014. Sorry, no pricing info is yet available.

Here is the Lapua Product Announcement for .221 Fireball and .50 BMG Brass:

Lapua Nammo .221 Fireball 50BMG fifty caliber .50 cartridge brass cases Finland

New 180-Grain and 150-Grain 7mm Scenar-L Bullets
The other big news from Lapua is the release of two new 7mm (.284 caliber) Scenar-L target bullets. Recognizing the popularity of 7mm cartridges among F-Class Open Division shooters, Lapua will offer a high-BC, 180-grain bullet. As part of the “L” series, this new 180-grainer bullet should exhibit extreme consistency in base-to-ogive measurements and bullet weight. We expect this new 180gr projectile to be extremely accurate in the .284 Winchester, .284 Shehane, 7mm WSM, and 7mm RSAUM — popular chamberings for F-Class and long-range benchrest shooters. No BC information has been released yet, but we expect the BC number to be quite high, giving this bullet great wind-bucking capability. In addition to the new 180gr 7mm Scenar-L, Lapua will offer a new 150gr 7mm bullet. This is optimized for medium range competition in Silhouette and Across-the-Course competition. It should offer great accuracy, but with less felt recoil than its 180-grain bigger brother.

Lapua Nammo 7mm .284 Scenar L 180 VLD .221 Fireball 50BMG fifty caliber .50 cartridge brass cases Finland

Permalink Bullets, Brass, Ammo, New Product, News 13 Comments »
November 23rd, 2012

The Sound of Silence: Suppressed .300 Blackout vs. .22LR

.300 AAC Blackout suppressor testThis week Student of the Gun (SOTG) heads to the range to see whether a suppressed centerfire rifle can be quieter than a rimfire rifle. SOTG tested sub-sonic .300 Blackout ammunition in an AAC Micro 7 bolt-action rifle fitted with an AAC suppressor (aka “silencer”). SOTG found that this suppressed AAC rifle, shooting sub-sonic ammo, was actually quieter than a rimfire rifle using standard velocity .22LR ammo. Watch the video below to see how the testing was done. Results are discussed at the five minute mark.

SOTG Video– Silent Shooting with the .300 Blackout

StudentoftheGun.com is a popular website that covers a variety of gun-related topics. (After the suppressor test, this week’s SOTG video includes segments on concealed carry and outdoor survival skills.) SOTG provides a full mix of content, including online videos, articles, books, and DVDs. A new video episode is uploaded every Tuesday by 6:00 pm. SOTG also offers self-defense instruction.

Permalink - Videos, Bullets, Brass, Ammo 1 Comment »