The sales of modern sports rifles are high these days, and many people are flocking to the AR-15. What exactly, then, is the best ammo to use with your AR 15 for home defense and range practice?
When we say the “best” ammunition, what sets the standard exactly? Generally, the right ammo will, obviously, be accurate. It will also penetrate the recommended 12-18″ of a perpetrator, and will not over-penetrate if you miss.
Moving on, let’s go over a few things to determine the best.
In this article, we will discuss a few different aspects such as AR 15 caliber, bullet type, and barrel twist.
There are two popular types of AR-15 calibers: 5.56x45mm NATO and .223 Remington. While the external dimensions of these two calibers are similar, it is important to understand that they are not in anyway the same.
Rifles that are built to handle the increased pressure of the 5.56 NATO can shoot the .223 Remington, but the reverse is not always likely.
You can always check what yours is by observing the model specs or barrel, which is usually stamped with the rate of caliber and barrel twist.
Though the two are nearly identical, the .223 is a civilian round and the 5.56 is military and may have its own specifications. While the .223 has SAAMI specifications (Sporting Arms and Ammunition Manufacturers’ Institute) the military grade of 5.56 may require higher pressure to go with a higher velocity.
To describe it quickly, it is the rate at which the rifle barrel rotates– or spins. It is represented by inches per turn, and it’s very important that the barrel twist rate is sufficient enough to stabilize the bullet being shot.
An example of what a barrel twist rate looks like is one that is a 1:10”, which means it will spin around one rotation in ten inches. If your ammo has a twist rate of 1:10, then it will work with a rifle of that rate, or anything faster which would be rates such as 1:9”.
Most barrels are going to be 1:7” to 1:9”, with 1:9” being one of the most common.
How Does Barrel Twist Rate Affect Stability?
There are different ideal rates for different barrels. The best way to line it up is by the measurement of the grain of a bullet (a grain is the mass of the bullet. 1 pound is the equivalent of 7,000 grains. For more info check out bullet guide). Bullets weigh anywhere between 15 and 750 grains.
What are Ideal Twist Rates for Barrels?
Weight: 40-Grain Twist Rate: 1:12
Weight: 55-Grain Twist Rate: 1:9
Weight: 62-Grain Twist Rate: 1:8 or 1:7
Weight: 77-Grain Twist Rate: 1:7 or 1:8
Weight: 80-Grain Twist Rate: 1:7
Types of AR 15 Bullets
We look at two main bullet groups you’ll notice a lot of. There is the full metal jackets (abbreviated FMJ) and the hollowpoint or softpoint (HP/SP).
There is a form of unwritten guideline that says HP’s are for carry and self-defense while FMJ’s are for the range or practice. While this isn’t an actual rule, many people live by it for similar reasons.
First, FMJs are generally cheaper, and not quite as lethally ideal as an HP or SP. That’s not to say it won’t get the job done however since our military is required to use only FMJ’s due to an international treaty from long ago.
What is Bullet Boat Tail?
Another acronym you might come across is BT, boat-tail, which refers to the back of a bullet. This one has an aerodynamic shape to it rather than a flat, cut-off look.
When considering military rounds (5.56) you will notice a lot of M193 and M855. Your standard FMJ is going to be the 55-grain M193. This is referred to as “ball” ammo, which generally just means military loading style.
Then you have the 62-grain M855, which is called the “green tip” penetrator round. It contains a steel rod in it. The reason it is green-tipped is that it is a hybrid of ball ammo but has a penetrator. Armor-piercing ammo will have a black tip, while the ball has no colored tip.
Differences Between 193 and 855
While there aren’t too many differences between the two, here is a list of some of the differences between the 193 and 855:
M855 penetrates better (thus the green tip)
M193 is better for soft targets of 100 yards or under
Certain ranges do not allow steel core ammo such as the M855 so please check with your range
AR 15 Ammo Recommendations
Having looked at all that information, let’s move on to some product recommendations. Below is a compiled list of different styles and families of AR 15 ammo that will suit your different AR-15 needs. You’ll find that the products come from Lucky Gunner because they are a reliable online ammo retailer.
Plinking is the practice of informal target shooting. This can be done with targets like cans, bottles, and any other homemade or natural target. People who practice this form of shooting are known as plinksters.
The following are steel cased so start of small if you’re unsure whether your AR-15’s barrel likes them or not. Not all work well with steel casing.
Keep in mind, also, that they are dirtier and not quite as accurate as brass. Still, for an even cheaper option, they will more than likely work for your target shooting.
(Note that these aren’t saveable for reloading like the brass is. Please check with your range to make sure they allow steel casings/bi-metal.)
The biggest difference between self-defense and range ammo is the fact that you want your defensive ammo to do its job by “putting down” the offender. For this reason, FMJ and penetrators aren’t the best choice, as they don’t break apart or pull a lot of energy.
There are types of ammo specifically for defensive use, such as hollow point. These are common among law enforcement. Here are our top two recommendations:
Best AR 15 Ammo for Defense and Range – Conclusion
Having gone over many aspects of AR-15 ammo and terminology, you can walk away knowing 5.56 and .223 are the best, and will be found in 55 gr and 62 gr. FMJ and HP will also determine a lot about the ammo and where it is best suited, and knowing all of this will aid in the barrel twist rate.
We hope we’ve helped you find the perfect ammo for you and your needs. There are plenty of other brands and types out there, but we’ve tried to keep the list down to our most trusted brands that have proven to be reliable and affordable.
Thanks for reading, and please check out our other articles as well for more information on all aspects of the firearm universe.
Drop a comment below sharing your favorite AR-15 self defense ammo!
Hey everyone I'm Chris. Founder and editor at Gun News Daily. This site was originally started by my father who passed it on to me. Gun News Daily has been reporting on gun news and conservative politics since 2001. We are the original gun news source. Life-long Second Amendment Supporter.