What Are All The Different 22 Calibers? Why Choose The .22 WMR?

A lot is going on with the .22 caliber round, and today we’re going to cover it. If you’ve ever asked yourself any of the following questions, you’ve come to the right place.

What’s the difference between a .22 Short and .22 Long? Is there a difference between a .22 Long and .22 Long Rifle? What’s a .22 WMR? Can you fire a .22 LR bullet inside a .22 WMR chamber? What is the best .22 WMR pistol? Discover all your answers to the famous .22 caliber in this blog. Good luck and happy hunting!

.22 Long, .22 LR, .22 Win Mag
Photo Credit: By Ryan D. Larson/Wikimedia Commons

.22 Short, 22. Long, .22 LR, and .22 Mag

Before I get too deep into this article, let me first note that any of the ‘finer details’ listed below are estimated averages for .22 ballistics. The weights are not specific to any one manufacturer. This is simply an educational piece, and I hope you leave here with a good comparison.

2 Pack Ruger BX-25 10/22 .22LR 25-Round Magazine

$44.99
at GunMag Warehouse
Prices accurate at time of writing
 

.22 Caliber History

How much do you actually know about our good friend, rimfire .22? Did you know it’s been a part of American history for over 150 years? What about the fact that it’s America’s oldest commercial self-contained metallic cartridge? Do you know the first .22 long was produced for revolvers? Or, that in 1887, when J. Stevens Arms & Tool Company developed this caliber, the Peters Cartridge Company would be the first to manufacture the long rifle for Stevens. Keep reading for some more history on the .22 caliber.

.22 Short

First developed for the Smith & Wesson Revolver in 1857, the .22 short for hunting small game is pretty popular, especially if you’re hunting rabbits and squirrels.

Originally produced as a self-defense caliber

.22 Short, .22 Long Rifle
.22 Short (left) .22 Long Rifle (right)/Photo Credit: Wikimedia Commons

.22 Long

Not near as common as .22 Short or .22 Long Rifle, there’s the .22 Long. The LR has definitely surpassed this caliber as it’s a slower, lighter, and shorter bullet. And it’s less accurate than the .22 LR, and the .22 short. 

The .22 Long is the second oldest rimfire cartridge

.22 Long Rifle

As already stated, the .22 LR caliber was developed in 1887. It has since become one of the most popular rimfire cartridges. And because of its low noise and minimal recoil, the round became really popular for shooting small-game and for sport.

The .22 LR is by far the most popular .22 caliber bullet across the country with many applications. I use my Ruger 10/22 for rodent control, squirrel hunting, plinking, and teaching my daughter how to shoot a rifle. With so many uses for a lighter caliber, the .22 LR isn’t going anywhere anytime soon.

High-velocity, copper-plated .22 LR rounds
High-velocity, copper-plated .22 LR rounds Photo Credit: X_Wad/Wikimedia Commons.

.22 Magnum

Some call it .22 Magnum, others a .22 Mag or .22 Win Mag, and some, .22 WMR (Winchester Magnum Rimfire). No matter what you call it, they’re all the same.

In 1959, the .22 Winchester introduced Mag to us — one should conclude this is how the W in WMR got its name. What you shouldn’t conclude is that Winchester was actually using this cartridge. Why? Because they weren’t. It wasn’t until the following year when Winchester would introduce the Model 61 pump-action rifle that they would use their own creation, the .22 WMR.

So, if Winchester wasn’t the first to chamber their own round, who was Marlin Levermatic?

Federal Champion Rimfire Ammunition .22 WMR 40 gr FMJ 50/box

$15.99
at Natchez Shooting Supplies
Prices accurate at time of writing

Subsonic vs. Supersonic

The very first .22 I shot was a .22 LR with the word subsonic printed on the front of the ammo box. With that, I figured it would be a good idea to talk about what this means. While this article applies specifically to the .22 caliber, you will hear this term about other calibers, too.

Subsonic rounds serve the purpose of eliminating noise after the bullet is flying (supersonic, not so much.) This is not the noise associated with suppressors. Suppressors reduce noise by about 30 dB, but not all noise.

CCI MeatEater Series Mini-Mag 22 LR

$31.99
at Kentucky Gun Co
Prices accurate at time of writing

As a former turret gunner in OIF, I could always tell how close bullets were to me, based on how they sounded. If a bullet made a “ping" sound and I couldn’t locate any sign of fire, I knew it was not a threat to me.

However, I knew when a bullet would make the sharp “snapping" sound of what we call a sonic boom, I was in imminent danger. A sonic boom or crack is a noise your bullet makes as it’s traveling through the air toward your target. The same works in reverse because you’ll only hear the sonic boom on the receiving end of 7.62x39mm bullets. 

shooting drill deck of cards

What is a Sonic Boom?

What exactly is happening when your bullet travels through the air? Or a better question: why does it make a sound? It doesn’t really make sense — or does it?

When your bullet travels, once it leaves the muzzle, the air creates 2 pressure waves. The first pressure wave is at the tip, and the second is at the bullet’s base. 

This pressure wave is closer or further away from the projectile based on how fast that bullet is traveling. For instance, if the bullet is traveling faster, then the pressure waves become closer. However, if your bullet is traveling slower, then that pressure is further out. 

Smith & Wesson SW22 Victory Kryptek

$457.99
at Guns.com
Prices accurate at time of writing

What is the Speed of Sound?

The speed of sound is about 1,125 fps at sea level, depending on the conditions surrounding you, so this number varies. For instance, if you go up in altitude, the speed of sound lowers. The speed of sound also lowers as the temperature rises.

It’s important to know how atmospheric conditions affect the speed of sound because you want to have ammunition with a lower velocity, 1,000-1,100 fps; this way, the ammo you have will actually stay subsonic.

When those pressure waves combine, something known as a shock wave happens, which produces the sound. A big trend we’ve seen in last past 3 years is the desire for subsonic ammunition in lower calibers like the .22 LR and .22 WMR.

Glock 44

$402.99
at Guns.com
Prices accurate at time of writing

Slower than the Speed of Sound vs. Breaking the Sound Barrier

To simplify things, if you see a box of ammo with the title "subsonic" on it, then it has a bullet that travels through the air, slower than the speed of sound; therefore, it’s quiet.

If your box of ammo has a label on it saying, "supersonic," then the bullet traveling through the air breaks the sound barrier. When you hear a "boom," that is the sound of the barrier being broken.

Subsonic Disadvantages

While subsonic ammunition is great because it’s loaded so as not to break the sound barrier, meaning no sonic boom, that doesn’t mean it doesn’t come with a few limitations related to velocity and energy.

CCI Maxi-Mag Rimfire Ammunition .22 WMR 40 gr TMJ 1875 fps 50/ct

$16.99
at Natchez Shooting Supplies
Prices accurate at time of writing
 

Velocity Chart

Depending on many factors, such as weight, bullet tip, case material, etc., bullet velocities can vary. I used the average bullet speeds based on the current load data by the Hornady Reloading Data Center and the SAAMI Specs

Bullet Caliber SubSonic Velocities (FT/Sec)SuperSonic Velocities (FT/Sec)
.22 LR1,060 1,260
.22 WMR N/A 1,875
.22 Short7101,164
.22 Long7351,215
9mm975 (Hornady 147 gr XTP 975 fps) 1,800

Low Velocity

If you have a .22 LR bullet capable of achieving a velocity of 1,060 fps, then it’s 1.2x faster than the speed of a Boeing 737 traveling at cruising speed! It also has a higher achievable velocity (again, an average) than .22 Short, at 900 fps — also faster than a cruising 737.

Subsonic loads have a lower maximum effective range because of their low velocity. That means your round is susceptible to the elements, such as wind drift, that can hinder trajectory.

Low Energy

Someone much smarter than I calculated the average .22 LR energy to be 100 ft. per lbs, which is double the energy of a .22 short, having an average of 50 ft. per lbs.

Why does this matter? Typically, when referring to muzzle energy, the higher that number, the higher the stopping power. Therefore, .22 LR has a greater stopping power at 100 fps over the 50 you get with .22 short.

Low velocity can cause a round not to gain enough speed to create the energy needed to expand (some manufacturers have won this battle). If you have a low velocity round, like those common with subsonic .22 ammunition, the stopping power becomes diminished — probably why people aren’t shooting large game with a .22.

Many subsonic ammo manufacturers will load the bullet heavy for the caliber to compensate for low velocity and allow for further penetration of the target.

A standard .22 LR caliber has about 1,200 fps and 140 ft per lbs of energy. Now, let’s compare that to a subsonic .22 LR caliber with about 1,050 fps and 100 ft per lbs. of energy. What does all this add up to? A much quieter shot because the reduced velocity lowers the decibel.

Supersonic

Supersonic ammunition breaks the sound barrier. This means you hear the sonic boom because the bullet passes through the barrier, creating a crack or booming sound as it travels through the air.

Because supersonic ammo has higher velocity and energy levels, it’s a better option for long-range over subsonic ammo. Unfortunately, though, it doesn’t give you the noise reduction available for subsonic rounds.

CCI 22 LR Stinger CPHP 32Gr 1640 FPS 50rd

$16.99
at Kentucky Gun Co
Prices accurate at time of writing

Suppressors vs. Subsonic and Supersonic

When you fire your weapon, there are two sounds. The sound diminished by using a subsonic round is the one I’ve been referring to as the sonic boom or what happens when the bullet breaks the sound barrier. However, subsonic rounds don’t eliminate all noise. For that, you’ll need a suppressor.

Q El Camino 22 LR Silencer

$400.00
at Primary Arms
Prices accurate at time of writing

A suppressor works to suppress the sound created from pressurized gases within the chamber, exiting the barrel through the muzzle to a sudden change in temperature and pressure.

Therefore, if you shoot a subsonic round through a firearm with no suppressor, you’re still going to hear a noise (sound from pressurized gas). In the same way, if you fire a supersonic round through a firearm with a suppressor, you’ll also hear a noise from the bullet breaking the sound barrier.

If you want to decrease gun blast and sonic boom, shoot subsonic ammo through a suppressed firearm.

Differences Between the .22 Mag and .22 LR

While bullet diameter was the same, the case of a .22 LR is shorter than the .22 Mag case.  The .22 WMR not only has a longer case, but the overall length is 0.350" longer than the more popular .22 LR. The biggest differences in performance between the 2 bullets are in bullet velocity and stopping power.

There is no argument the .22 WMR is more powerful and more punishing than the .22LR. Reliability and accuracy issues have been concerns with .22 WMR pistols because most of us already know how reliable our .22 rifles are. Everyone I know owns a .22 LR chambered pistol or handgun because it’s practical, doesn’t require hearing protection, and is perfect for training, varmint hunting, and plinking. 

A .22 Magnum is louder than .22 LR, but it doesn’t have a substantially larger felt recoil. In fact, the Kel-Tec PMR 30 feels like I’m shooting a louder version of a Glock 44

Would I carry a .22 caliber for self-defense?

I’d never use a .22 LR as a self-defense gun because it lacks serious stopping power and velocity. However, a .22 WMR can approach within 50 Ft-lbf of the 9mm in energy. This gives us the opportunity to use a .22 WMR, like the Kel Tec PMR 30, as a self-defense gun for your family. With a standard 30-round capacity, I’d trust that any intruder on the other end will not continue their aggression. 

Can I Shoot 22LR Out of 22 Mag?

No! I get the bullet diameters are almost identical and that we can switch the chambers in revolvers out, but the .22 LR case is too small for the .22 WMR chamber.  The .22 WMR bullet sits down inside the case to have more control over the projectile at much faster rates than the .22LR. You can/will either destroy the gun barrel and/or injured your hand, face, or other bystanders. 

Bullet Specs.22 WMR.22 LR
Bullet Velocity (Ft/Sec)1,8751,640 
Bullet Energy (Ft-lbf)300+130-205

Case Length

1.055" (26.8 mm).613" (15.6 mm)

Overall Length

1.350" (34.3 mm)1.000" (25.4 mm)

Bullet Diameter

.224" (5.7 mm)0.223" (5.7 mm)

Rim Diameter

.294" (7.5 mm).278" (7.1 mm)

Neck Diameter

.242" (6.1 mm).226" (5.7 mm)

Base Diameter

.242" (6.1 mm).226" (5.7 mm)

Hornady 22 WMR 30 Gr V-Max 50 Rds

$20.99
at Kentucky Gun Co
Prices accurate at time of writing

What is the Best .22WMR Pistol?

There are a few pistols chambered in the .22 WMR because it’s not as sought after as the .22 LR and the 9mm Luger. However, there are 2 pistols that I would consider buying if I were looking for a .22 WMR pistol. First, the Kel-Tec PMR 30, second, the Rock Island Armory XT 22 Mag Target Pistol. 

Before I make my decision on a gun vs the other, I always look at the mag capacity, weight, height, price, and performance. As I hold the Kel-Tec and RIA .22 WMR, the PMR30 is much lighter and almost feels like an airsoft gun. before I shot the Kel-Tec, I was worried about the recoil of a gun that barely touches 1 lb with a full magazine. The near-zero felt recoil of Kel-Tec PMR 30 is impressive and only adds to the fun of shooting 30 rounds with no recoil. 

The RIA XT 22 Mag Target Pistol feels more like a 9mm than the Kel-Tec model with a 2.5 lbs weight (unloaded), and a 5" barrel to match most modern full-frame 9mm pistols. The G10 grips on the RIA XT are a gracious nod to the American icon, 1911.

The adjustable trigger feels fantastic, but still not as smooth as the Kel-Tec 5 lbs trigger pull. Another solid feature is the extended beavertail design to help keep your hand safe from slide-bite. I like the fact that it gives me an opportunity for a higher grip angle for more control. 

Maglula Kel-Tec PMR-30 / CMR-30 LULA Loader & Unloader

$34.99
at Natchez Shooting Supplies
Prices accurate at time of writing

Kel-Tec PMR-30 Vs. Rock Island XT .22 Magnum Target Pistol

 Kel-Tec PMR-30Rock Island XT .22 Magnum Target Pistol
Caliber .22WMR.22WMR
Length (Overall)7.9"8.54"
Barrel Length4.3"5"
Width1.3"1.3"
Height5.8"5.51"
Weight (Unloaded)0.9 lbs (14 oz)2.5 lbs (40 oz)
Magazine Capacity30,5514
Trigger Pull4.5 lbs4-6 lbs (Adjustable)
MSRP$545.00$649.99

Why Did I Choose The Kel-Tec PMR-30?

The Kel-Tec PMR-30 is less than half the weight of the RIA XT with a lighter trigger pull and more features. For example, the Kel-Tec .22 WMR is optic-ready with an under-barrel Picatinny rail for an easy attachment of a laser or light combo. The ability to add optics, lights, lasers, and after-market night sights, makes the Kel-Tec a more versatile and unique offering in the .22 WMR caliber.

Best Magazine Capacity

The Kel-Tec PMR 30 has a standard magazine capacity of 30 rounds versus the 14-round magazine for the Rock Island XT .22 Magnum Target Pistol. The Kel-Tec pistol has about 54% better magazine capacity compared to the XT .22 Mag from RIA. 

When I’m buying a .22 caliber gun, I’m looking for high-capacity magazines that I can plink on the range with and have a good time. Kel-Tec wins the magazine debate without question, with the magazine capacity that most rifles look for. 

Most Affordable .22 WMR Pistol?

Depending on where you look, I’ve seen the Kel-Tec PMR 30 for as little as $460.00, whereas the RIA XT Target Pistol is harder to find and $529.99. The PMR 30 has a clear advantage in price point as well. Both pistols are a lot of fun, but I don’t think the slight accuracy advantage with the RIA XT is worth the difference in price. 

Where Can I Buy The Kel-Tec PMR 30?

GritrSports.com- $ 459.00

Guns.com-$458.99

Sportsman’s Warehouse-$488.99

Kel-Tec PMR 30 .22 WMR Pistol

$460.99
at Kentucky Gun Company
Prices accurate at time of writing

Where Can I Buy The Rock Island XT 22 Magnum?

Sportsman’s Warehouse-$529.99

RIA XT 22 Mag Target Pistol

$588.99
at Guns.com
Prices accurate at time of writing


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Table of Contents

  • .22 Short, 22. Long, .22 LR, and .22 Mag
  • .22 Caliber History
  • .22 Short
  • .22 Long
  • .22 Long Rifle
  • .22 Magnum
  • Subsonic vs. Supersonic
  • What is a Sonic Boom?
  • Slower than the Speed of Sound vs. Breaking the Sound Barrier
  • Subsonic Disadvantages
  • Low Velocity
  • Low Energy
  • Supersonic
  • Suppressors vs. Subsonic and Supersonic
  • Differences Between the .22 Mag and .22 LR
  • Can I Shoot 22LR Out of 22 Mag?
  • What is the Best .22WMR Pistol?
  • Kel-Tec PMR-30 Vs. Rock Island XT .22 Magnum Target Pistol
  • Why Did I Choose The Kel-Tec PMR-30?
  • Best Magazine Capacity
  • Most Affordable .22 WMR Pistol?
  • Where Can I Buy The Kel-Tec PMR 30?
  • Where Can I Buy The Rock Island XT 22 Magnum?

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