The Glock 40 (also known as the Glock 23 or 27 in .40 S&W chambering) uses **.40 S&W caliber ammunition**, specifically .40-inch diameter bullets.
What is the best ammo for Glock 40?
The best defensive ammo for a Glock 40 (.40 S&W) includes premium bonded hollow points such as Winchester Ranger Bonded (180 gr), Remington Ultimate Defense (180 gr), and Winchester PDX-1 (165 gr).
These loads are designed for maximum penetration and controlled expansion for self-defense. They balance velocity and retained weight nicely. For target practice, Blazer Brass or PMC FMJ (165–180 gr) work great and won’t break the bank. Just make sure to check pressure signs and function test any load in your specific firearm before trusting it for carry.
What does a Glock 40 shoot?
A Glock chambered in .40 S&W shoots **.40-inch diameter bullets** weighing from 105 to 200 grains.
Defensive loads usually run between 135 and 180 grains. Target and practice ammo often comes in 165 or 180 grain full metal jacket (FMJ) flavors. Smith & Wesson introduced the .40 S&W in 1990. The goal? Offer 10mm-like performance in a shorter, more controllable package.
Are .40 cal and 10mm bullets the same?
No, .40 S&W and 10mm bullets are not the same — they are similar in diameter but not interchangeable in all firearms.
Here’s the thing: the .40 S&W uses a shorter case, so it generates less pressure and velocity than 10mm Auto. A 10mm typically launches a 180 gr bullet at ~1,250 fps (624 ft-lbs), while a .40 S&W does ~1,000 fps (~400 ft-lbs). Both calibers share bullet diameters (~0.400"), but their case dimensions are quite different.
What caliber bullet does a Glock 40 use?
A Glock 40 uses **.40 S&W caliber ammunition**, firing bullets approximately 0.40 inches in diameter.
Bullet weights range from 105 to 200 grains. The most common loads are 165, 180, and 200 grains. This cartridge was designed to deliver performance close to the FBI’s early 10mm load, but in a shorter, easier-to-control package.
Is 40 caliber ammo hard to get?
As of 2026, .40 S&W ammo remains less widely stocked than 9mm and .223, but it is generally available through major retailers and online dealers.
Now, supply chain disruptions can temporarily reduce availability during crises. Check local gun stores, big-box retailers, and online vendors like MidwayUSA or Brownells for current stock. You’ll usually find it, but expect to hunt around a bit more than with more common calibers.
Is 40 cal good for home defense?
.40 S&W is a viable and effective home defense caliber, especially for shooters already trained with it.
It offers a nice balance of stopping power and controllability. Plus, it has sufficient penetration for typical interior walls. If you’re already comfortable shooting a .40 S&W pistol, stick with it — retraining with a new caliber isn’t necessary unless you prefer lighter recoil.
Is the Glock 40 a good gun?
The Glock 40 (Gen 3, 4, or 5 in .40 S&W) is a solid, accurate, and powerful handgun suitable for home defense and target shooting.
Honestly, this is one of the better options in this caliber. It’s not ideal for concealed carry due to heavier recoil and larger size, but it’s a favorite for duty and home use. Reliability is excellent with proper maintenance and high-quality ammo.
Which Glock do police use?
Many U.S. police departments use the Glock 22 or 23 in .40 S&W, particularly those that adopted the caliber in the 1990s and 200s.
The Glock 22 holds 15+1 rounds and offers a solid balance of power and capacity for duty use. Some agencies have since switched to 9mm, following FBI recommendations or to save on costs.
Which is better Glock or Smith and Wesson?
Glock generally offers better overall build quality and consistency across models compared to Smith & Wesson M&P series, especially in fit, finish, and durability.
S&W makes reliable firearms at lower prices, but Glocks tend to have tighter tolerances and longer service life. Both brands are widely used and respected, so it really comes down to personal preference.
Can you shoot a 40 cal in a 10mm?
No — shooting .40 S&W in a 10mm pistol may damage the chamber and create a dangerous condition.
Never fire incorrect ammunition. Each cartridge has unique case dimensions and pressure levels. Always match ammo to the firearm’s chambering — it’s not worth the risk.
Is a 10mm more powerful than a 357 magnum?
Yes — 10mm Auto is generally more powerful than .357 Magnum, delivering higher muzzle energy with similar or larger bullets.
Typical 10mm loads (e.g., 180 gr at 1,250 fps) generate ~624 ft-lbs, while .357 Magnum (125 gr at 1,450 fps) generates ~583 ft-lbs. The 10mm also offers higher magazine capacity in most semi-auto pistols.
Is a 10mm more powerful than a 45?
The 10mm Auto is more powerful than the .45 ACP in most load comparisons, though recoil is slightly higher.
For example, a 10mm 180 gr JHP at 1,250 fps (~624 ft-lbs) outperforms typical .45 ACP loads (230 gr at 830 fps, ~356 ft-lbs). Well-trained shooters can manage the recoil with quality firearms.
What Glock does FBI use?
As of 2026, the FBI has issued the Glock 19 Gen 5 in 9mm as its primary service pistol.
This decision followed extensive testing. The FBI found 9mm’s effectiveness with modern defensive ammo and reduced recoil for rapid follow-up shots to be superior.
What ammo does Glock recommend?
Glock recommends using quality 9mm ammunition (e.g., 9x19mm Parabellum) for its 9mm pistols, such as the Glock 17, 19, or 26.
Glock doesn’t endorse specific brands but advises shooters to use cartridges within SAAMI pressure limits. Always test new ammo for function and reliability in your specific firearm.
Is 40 more powerful than 9mm?
.40 S&W typically delivers more muzzle energy and felt recoil than standard-pressure 9mm loads, though ballistic gel results vary by bullet design.
For example, a 180 gr .40 S&W at 1,000 fps (~400 ft-lbs) is more powerful than a 115 gr 9mm at 1,150 fps (~286 ft-lbs). However, modern 9mm defensive loads (e.g., 124 gr +P at 1,200 fps) can close the gap significantly.
