.300 Blackout - Take The Plunge

Posted by Steve Horsman

May 1, 2018 9:51:50 AM

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Historically, I have been hesitant to jump on the bandwagon of newly introduced cartridges.  I am  already heavily invested in several pistol and rifle calibers. When a new caliber comes out, I usually wait to see how it’s received and if it’s going to stick around. So when the .300 Blackout made its appearance several years ago, I took the “wait and see” approach.   

As time went on, and it was apparent that the .300 Blackout was here to stay, I took the plunge and built an AR-style rifle with parts that I had on hand. I had to buy a barrel in .300 Blackout, so I invested in a 16”.  When I put it all together, the rifle worked great. I’ll admit that I have only put a few hundred rounds through that gun, but like any good firearm enthusiast, I purchased the dies and components to eventually hand load .300 Blackout. 

As time went on, I continued researching the caliber, but my .300 blackout rifle largely remained in the gun vault due to other firearm projects taking priority.  #FirstWorldProblems

DUTY CALLS

In late 2017, Springfield Armory® introduced the SAINT™ Pistol in 5.56, and to say it has been successful would be a huge understatement! Prior to the release, I was tasked with testing the pistol and subsequently penned a blog about it shortly after it came out. Click here to read about the .556 SAINT™ Pistol.

After literally shooting thousands of rounds through my 5.56 SAINT Pistol (and having a lot of fun), I started to think that a cool, new version would be if it were available in .300 Blackout.  Well, the decision makers at Springfield Armory® were on the same track (great minds think alike), and designed the newest SAINT Pistol chambered in .300 Blackout. 

I was excited to get my hands on one of the early production samples and I admit, though I really like the first 5.56 SAINT Pistol, I LOVE the newest chambering of .300 Blackout.  

My .300 Blackout test firing consisted of shooting multiple steel and paper targets at 80 yards, and I also performed some reload drills. The only ammunition I had on hand when testing the .300 Blackout was 125-grain supersonic FMJs. Even though that ammo may not have been the optimal choice, the .300 blackout SAINT Pistol functioned perfectly and shot amazingly well. I was able to put one round on top of another at the 80-yard distance. I was very pleased to say the least.

BALLISTIC COMPARISON

There is a ton of ballistic data available for the .300 Blackout on the internet, so I will share just a little of the basic info with you here. 

Compared to the 5.56 round, the .300 Blackout performs really well, and it actually excels in a short-barreled gun (primarily because it doesn’t lose velocity as rapidly as the 5.56 out of a shortened barrel). 

The 5.56 REQUIRES velocity for peak performance whereas the .300 Blackout’s peak performance is based much more on the combination of bullet weight and velocity. 

What I am basically saying is that the lightest bullet (commonly a 110-grain projectile) in the .300 Blackout is double the weight of the most common 5.56 bullet weight (a 55-grain projectile).  

A quick comparison shows that a 55-grain 5.56 round out of our 7-inch SAINT Pistol comes out at about 2300 FPS, creating about 650 foot pounds of energy. On the other hand, the 110-grain .300 Blackout round comes out of the 9-inch SAINT™ Pistol at about 2100 FPS, creating about 1090 foot pounds of energy. 

If you’re more of a visual learner like I am, this may process better:

SAINT Pistol 5.56        55 gr. bullet     7-inch barrel     2300 FPS      650 FT LBS

SAINT™ Pistol .300       110 gr. bullet     9-inch barrel     2100 FPS     1090 FT LBS

Ballistically speaking, because of the huge difference in bullet weight, the comparison is pretty incredible!  

SIDE BY SIDE SAINT PISTOLS

At first glance, the SAINT Pistols in 5.56 and .300 Blackout visually appear similar, but on closer inspection you will notice that the .300 Blackout version does not share the muzzle blast diverter that the 5.56 has. Also, the barrel on the 5.56 model is 7 inches long, whereas the .300 Blackout has a 9-inch barrel with a conventional A-2 flash hider / suppressor. 

NOTABLE SIDE NOTE

Most gun enthusiasts know that all 5.56 / .223 AR-style magazines and ammo work and function perfectly with .300 Blackout chambered guns. This may seem like a small detail to some, but the reason this is critically important to talk about is that the opposite is NOT true. Do NOT try to shoot a .300 Blackout cartridge through a 5.56 firearm.

While it may take some effort to get the .300 Blackout round into the chamber of the 5.56, it is extremely dangerous and will cause great damage. Just do a Google search to see photos and video of what actually happens. It’s not good and it’s not pretty. #ChamberDanger

Needless to say, I was very happy to see that the SAINT Pistol .300 magazines are smartly marked “.300 Blackout” on the side. This makes it easy to quickly differentiate from my 5.56 mags when I put my new SAINT .300 Blackout into the gun safe with the rest of my arsenal.  

WRAP AND ROLL

The Springfield Armory® SAINT™ Pistol in .300 Blackout just might be the perfect size-to-power ratio in an AR-based pistol. The .300 and I will be spending a lot of time together this summer both at my backyard range and in my truck. Now, I’m not getting rid of my first 5.56 SAINT™ Pistol in the truck. I’ll just have two now - one for me and one for my lovely Mrs. The sleek, compact size of the SAINT™ pistol family makes that totally doable.

I’m also making space in my reloading bunker, because I’m now committed to another proven caliber.  


Springfield Armory® recommends you seek qualified and competent training from a certified instructor prior to handling any firearm and be sure to read your owner’s manual.  These articles are considered to be suggestions and not recommendations from Springfield Armory®.

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