The 38 Super and 45 ACP are two powerful centerfire handgun cartridges most commonly chambered in the 1911 pistol.

Although a somewhat obscure cartridge, the 38 Super is held in high regard in the competitive shooting community and was originally developed for law enforcement to defeat the rudimentary body armor and light sheet steel car doors of the 1930's.

The prowess of the 45 ACP is well established and has been battle proven for well over a century in war and on the streets.

When considering a new handgun caliber, it's a good idea to understand the advantages and disadvantages of each before making a final decision.

In this article we will take an in depth look at the 45 ACP and 38 Super to help you decide which of these handgun cartridges will be the best option for your new semi-automatic pistol.

What is The Difference Between 45 and 38 Super?

The difference between 45 and 38 Super is the bullet diameter each cartridge fires and their muzzle velocity. The 45 ACP fires a 0.452" diameter bullet at lower muzzle velocity while the 38 Super fires a 0.356" diameter bullet at higher muzzle velocities.

Cartridge Specs

When comparing two handgun cartridges, it's a good practice to examine the differences in case design to gain more knowledge of each.

Obviously, the biggest difference between the .38 Super and .45 ACP is the bullet diameter that each cartridge fires. The 45 ACP fires a 0.452" diameter bullet compared to 0.356" for 38 Super. For reference, a bullet diameter of 0.356" is the same as those fired in the 9mm Luger.

Another major difference is that the 38 Super cartridge is semi-rimmed while the 45 ACP is a rimless design. The semi-rim can cause feeding problems in double stack magazines in a condition referred to as rimlock. As the 38 Super is very popular for open gun shooters in IPSC and USPSA that need to make major power factor, there are variants of the 38 Super that are nearly rimless to remedy the any feeding issues.



The other major difference between the 45 and 38 Super is the maximum pressure each handgun cartridge can handle. The 45 ACP is a lower pressure round and can handle 21,000 psi of pressure per SAAMI specs. In contrast, the 38 Super is rater for higher pressure and can handle 36,500 psi, which is 14,500 psi higher than 45 and 1,500 psi higher than 9mm Luger.

As the 38 Super has a smaller diameter than the 45, it's no surprise that the 38 Super has a lower case capacity than its big brother, the 45 ACP. The 38 Super can house 17.6 gr of powder while the 45 has over 50% more case capacity at 26.7 gr.

The case length and overall length between both handgun cartridges is essentially identical. This is because the 38 Super was designed to be fired from the Colt 1911 handgun, therefore the 38 Super had to conform to the magazine overall length requirements for the pistol. Both cartridges headspace off the case mouth as opposed to a 357 Magnum which will headspace off the rim.

Stopping Power/Kinetic Energy

Stopping power is one of those ubiquitous terms that gets thrown around campfires and gun store counters and is completely unquantifiable. You'll hear stories of how boutique rounds like the 357 SIG have "More stopping power than a 9mm Luger" or how, "The 357 Magnum is a real man stopper".

The important thing to remember is that shot placement is more important than any ballistics values as a .22LR between the eyes will always be more lethal than a 500 Smith & Wesson Magnum to the hand.

However, we can quantify how many ft-lbs of force is imparted upon the target for each cartridge.

Muzzle energy is directly correlated to bullet weight and muzzle velocity, therefore different factory loads will have energy based on how hot they want to make the cartridge.



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Your run of the mill 130 grain full metal jacket (FMJ) 38 Super practice ammo will typically have a muzzle velocity around 1,200 fps and 425 ft-lbs of energy. Comparatively, Winchester white box 230 grain FMJ 45 ACP ammo will run around 835 fps and 356 ft-lbs at the muzzle.

Clearly the 38 Super has more ft-lbs of muzzle energy compared to the 45 ACP, however these are just practice loads. Self-defense jacketed hollow point (JHP) ammo from manufacturers like Buffalo Bore, Cor-Bon, or Underwood is typically loaded hotter for deeper penetration.

Both the 45 ACP and 38 Super have +P loads available and registered with SAAMI. +P loads are those that are loaded to higher pressure for improved terminal ballistic performance. However, that added pressure comes at the cost of higher recoil and muzzle flip, so make sure to practice with your defense loads in your concealed carry gun, as they can be more difficult to shoot than FMJ practice ammo.

For example, Buffalo Bore offers a 38 Super +P 115 grain hollow point that leaves the muzzle at 1,450 fps with 537 ft-lbs of energy (20% higher than practice ammo). Furthermore, a 185 grain hollow point +p 45 ACP load can leave the muzzle at 1,200 fps and 592 ft-lbs of energy (which is higher than 38 Super).

Safety Note: Not all handguns chambered in 45 ACP or 38 Super are rated for +P ammo. Refer to your owner's manual or manufacturer's website to determine if your handgun can handle +P loads. If you are still unsure, then seek the services of a qualified gunsmith.

Both the 38 Super and 45 ACP are powerful handgun cartridges and will have more than enough kinetic energy to stop a threat should you find yourself in a self-defense situation. Although muzzle energy will be dependent upon the manufacture of your defense loads, both will have more than enough stopping power for your concealed carry semi-auto handgun.

Recoil

Recoil is an important consideration when purchasing a new self-defense handgun. A round with heavy recoil will be more difficult to control and will slow your rate of follow up shots.

Recoil is affected primarily by muzzle velocity (FPS) and bullet weight. The faster a bullet travels, the harder it pushes back on the shooter. Furthermore, a heavier bullet requires more force to push it out the barrel, which is returned to the shooter's wrists.

The way recoil is felt varies from shooter to shooter.



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In general, the 38 Super will have less recoil than the 45 ACP. As it shoots lighter bullets, the 38 Super will have less momentum and therefore less force transferred back into the shooter's wrists.

However, neither cartridge is known for having offensive or painful recoil. Although the 45 ACP will have more free recoil energy, many shooters report it as feeling like a rolling push that is very manageable with minimal muzzle flip.

The bottom line is that you should not have a problem shooting all day at the range with your favorite semi-auto handgun for either cartridge. However, for recoil sensitive shooters, the 38 Super is the better choice.

Velocity/Penetration

If there's one thing that the 38 Super is known for, it's velocity and penetration.

During the Prohibition Era of the late 1920's and early 1930's, bootleggers and gangsters started using early forms of body armor. Essentially just a thin layer of steel, the new body armor was strong enough to stop the 45 ACP loads law enforcement carried at that time, but it could not handle the 38 Super.

When it comes to defeating body armor and car doors, speed kills. And 38 Super was very fast for the era and easily punched through these barriers that law enforcement needed to defeat.

Although the 38 Super cannot defeat modern body armor, it is still the better option for shooters who want a flatter trajectory, higher muzzle velocity, and deeper penetration.

Magazine Capacity

The 38 Super will generally have more rounds in the magazine than a 45 ACP.

As the 38 Super is the smaller cartridge, it's easier to fit more rounds in the magazine. Single stack magazines for the 1911 will typically hold 9-10 rounds for 38 Super and 7-8 rounds for 45 ACP.

For double stack mags for 38 Super can easily accommodate 17 rounds or more for IPSC/USPSA race guns (24+ rounds). Double stack 45 ACP magazines typically carry around 12-13 rounds.

Hunting

Neither the 38 Super nor 45 ACP is known for being a good option as a hunting round. Most semi-auto handgun cartridges lack the required kinetic energy (1,000 ft-lbs) needed to ethically harvest whitetail and both the 38 and 45 are in this category. For medium sized game, a 44 or 357 Magnum would be a better option.

For small game or varmints, either cartridge would work if you could get close enough. The 38 Super would be the better option as it has a flatter trajectory and will be easier to use at long range than the 45 ACP. However, as most varmints and small game are excellent at keeping their distance from humans, neither round is a particularly good option for hunting.

Concealed Carry/Home Defense

What the 38 Super and 45 ACP lack in hunting prowess, they more than make up for in self-defense capability.

Ever since the introduction of the Colt 1911, 45 ACP pistols have been extremely popular for home defense and concealed carry. Shooters and CCW permit holders love the raw power the 45 ACP provides as well as the massive permanent wound channel that modern hollow point ammo offers.

The 38 Super never really got its time to shine and lived in relative obscurity as the 9mm Luger took center stage as the premier 9mm diameter bullet.



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However, the 38 Super is an extremely capable self-defense round and should not be overlooked especially if you enjoy the 1911 platform.

Although there are fewer handguns available in 38 Super, a 1911 in 38 Super offers many advantages for concealed carry over its 45 ACP counterpart. The 38 Super has higher magazine capacity and less recoil than a 45 ACP even in a commander sized 1911. This makes for a potent carry package that will allow shooters to carry more rounds for the same weight as a 45 ACP.

And when you are concealed carrying, more rounds are always better.

However, ammo weight is not a consideration for home defense, and this is where the 45 ACP really shines. As the 45 ACP has generally lower penetration, this means it will have a lower propensity to over penetrate. Over penetration is an important consideration when taking shots inside the home, whether you live in an apartment or subdivision, as the last thing you want is for your rounds to injure an innocent bystander.

While the added penetration is a benefit for concealed carry, as shots may need to punch through multiple layers of clothing, it is more of a liability for home defense.

Therefore, the 45 ACP is the better choice for home defense while the 38 Super is a great option for concealed carry.

Ammo and Handgun Cost/Availability

Ammo cost is something to think about when considering new semi-automatic pistols, as you want to make sure that you can afford to practice with your new handgun.

Although neither round is ridiculously expensive, the 45 ACP will generally cost less to shoot as it is more popular than the 38 Super.

Buying in bulk is always smart, make sure to check out our stock of bulk 45 ACP ammo.

In general, FMJ practice ammo will run you about $0.60/round and premium JHP defense loads
will cost about $1/round (or more) for 45 ACP. For 38 Super, FMJ ammo typically runs about $0.90/round and JHP ammo costs on average $1.50/round.

The lack of popularity really hurts your 38 Super ammo options as there are fewer manufacturers who have offerings for the handgun cartridge. Reloading helps with this, and that will be discussed in the next section.

For handguns, most 38 Super offerings are 1911's or compensated 2011 patterned handguns reserved for competition. Therefore, if you don't like the 1911 platform, you are extremely limited with the 38 Super.

In contrast, there are a myriad of semi-automatic pistols available in 45 ACP as it is one of the most popular handgun cartridges in the USA. Of course, the venerable 1911 is extremely popular, but Smith & Wesson, Remington, Glock, Springfield, Ruger, Sig Sauer, and CZ all have 45 ACP pistols that are NOT 1911s.

When it comes to overall cost and availability, the 45 ACP is clearly superior to the 38 Super due to sheer volume and popularity.

Reloading

Reloading is one method that many shooters use to reduce their overall cost per round. As 38 Super factory loads are harder to come by, shooting handloaded ammo is one method that many fans of the caliber use to ensure that their ammo supplies are always flush.

The 38 Super cartridge offers a lot of flexibility in terms of reloading, as you can load it hot for higher muzzle velocity or use less powder for a softer-shooting practice round.

Many competitive shooters appreciate the 38 Super and its ability to be loaded hotter than the 9mm for their open guns with a compensator. These shooters need to make major power factor, a rating used in USPSA and IPSC, based on bullet weight and muzzle velocity to put themselves in a more favorable scoring system.



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The problem with 9mm Luger is that you must load the cases well over book maximum to reach major power factor. With 38 Super, you do not need to load the rounds as hot since the case is rated for higher pressure.

Before shooting handloaded ammo or anything near maximum pressure out of your handgun, you should always consult a gunsmith to ensure your chamber is rated to handle higher pressure. Never load over manufacturer's published maximum charges for your given cartridge.

Ballistics: 45 vs 38 Super

Our team here at Ammo.com has spent countless hours scouring the Internet to bring you extremely comprehensive ballistics tables for both calibers. These tables will compare bullet weight to muzzle velocity, kinetic energy, and trajectory.

38 Super Ballistics: Chart of Average 38 Super Ballistics

Note: This information comes from the manufacturer and is for informational purposes only. The actual ballistics obtained with your firearm can vary considerably from the advertised ballistics. Also, ballistics can vary from lot to lot with the same brand and type load.

38 Super Development/History

The 38 Super was developed and released by the Colt Manufacturing Company in 1929 and was initially marketed to law enforcement to penetrate early forms of body armor and car doors.

Developed from the .38 ACP (NOT the same as the 380 ACP), the 38 Super was capable of handling higher pressures and allowed the round to achieve the muzzle velocity needed to penetrate the obstacles law enforcement faced.

Also known as the 9x23mmSR, 38 Superauto, or 38 Super Auto, the 38 Super retains the same external case dimensions as its parent case. However, the 38 ACP was designed to headspace off the semi-rim of the case and once the 38 Super was adapted to the 1911 platform, the case rim was no longer supported.

This caused the 38 Auto to be inherently inaccurate as the case was not supported in the chamber.

It wasn't until Irv Stone of Bar-Sto barrels re-designed the 38 Super chamber to headspace off the case mouth that the accuracy of the 38 Super was realized.

Although the 38 Super was the answer that law enforcement needed at the time, it was quickly eclipsed by the release of the 357 Magnum a mere 6 years later.

The 38 Super was designed to fire a 130 grain bullet at 1,215 fps and have 426 ft-lbs of muzzle energy.

Today, the 38 Super is held in high regard in competitive shooting circles, as it allows Open Class shooters to achieve major power factor in their compensated race guns without loading their cases to dangerous pressure levels.

Evaluate the pros and cons of the 45 vs 38 Super for your new 1911. Make an informed choice for your shooting needs. Click to read more 45 vs 38 Super: Which Is Best For Your New 1911?