Basic Bullet Guide: Sizes, Calibers, and Types


I think one of the most daunting things when I first started looking for a gun was what size bullet to get?

At the time I figured all bullets kill just fine so it was just a matter of what gun I like.

Ah, I was so young and naive back then.

As time has passed, I’ve learned that I was only half right…all bullets kill but some bullets kill better than others.

What we’re going to be talking about here is purely bullet size and the benefits/weaknesses of each.  Now, there’s A LOT of sizes out there but I want to cover the ones you’re most likely to see and/or use.  These are the ones that you can walk into just about any sporting goods store and buy.

Then we’ll follow up with some bullet terminology and the different types of bullet tips (hollow point, etc), how shotgun shell sizes work, and a breakdown of the components of a round.  By the end you’ll be a bullet pro!

Bullet Size & Caliber


For guns, “caliber” means the diameter of the barrel and thus the diameter of the bullet that is going through it.  Also for terminology sake, “bullet” just means the metal projectile, while the entire thing is called a cartridge.

Parts of a Bullet Cartridge
Parts of a Bullet Cartridge

We’re going to cover a lot in this article, including:

  • Rimfire vs Centerfire
  • Common Calibers
  • Common Bullet Types
  • Components of Cartridges

If you want to jump ahead, check out our suggestion for the Best Place to Buy Ammo Online.

Now what you’ve been waiting for…

Rimfire vs Centerfire

The first differentiator is between rimfire and centerfire cartridges.

The rimfire’s primer is built into the rim while the centerfire cartridge has the primer in the center.  Rimfires are extremely cheap (few cents each) and the .22LR is the most popular rimfire caliber.  For even more differences, see our article on rimfire ammo or familiarize yourself with how guns work.

Centerfire vs Rimfire Primer
Centerfire vs Rimfire Primer
Rimfire vs Centerfire
Rimfire vs Centerfire

Common Bullet Calibers

There’s A LOT of bullet calibers, but you might not run into more than a handful in your lifetime.  We’ll be going over 18 calibers in total I have on hand, but let’s start with the top 11 most common sizes (in my opinion) first.

Common Bullet Sizes
Common Bullet Sizes

Overview of More Common Bullet Calibers

To make things a little more confusing, there’s a mixture of measurements in inches and millimeters.  There’s also a unit of weight called a “grain” which is used to denote the weight of bullets.  A “grain” is really small since 7000 grains make up one pound.

When you talk about bullets at this high of a level, the most high level trait is “Stopping Power”.

This is a relatively vague trait and somewhat controversial.  What it boils down to is how many bullets does it take to drop a person.  Granted, if you hit someone in the right spot it only ever takes one but in most situations you’re aiming for center mass (a.k.a. the chest, a.k.a. the largest target available).

Some bullets have enough power or other traits that will cause damage to organs even if you don’t hit them directly. You might also hear about a term called “Hydrostatic Shock” but that’s an entire article unto itself.

Now let’s go through some!

More Common Bullet Calibers
More Common Bullet Calibers


The “twenty-two” long-rifle is the most common caliber in terms of units sold.

It has a bullet weight of around 30-40 grains and is extremely mild shooting in both pistols and rifles.  The recoil is almost non-existent which makes it a great starter round for someone who has never shot a gun or is uncomfortable with the noise.

The low price of the bullets is also great for learning sight pictures.  It is traditionally the starting caliber for shooters.  These things are only a few steps up from a pellet gun round.

They can kill, don’t get me wrong, but they’re mostly for killing rats, snakes and birds. They’ll kill an attacker for sure but it might take a shot or six.

I have extremely fond memories of earning my Rifle Shooting merit badge with a .22LR.  Many popular handguns and rifles have .22 versions or adapters that let you practice on the platform but use the inexpensive .22LR ammo.

Price: ~ 7 cents

.25 ACP

Slightly larger than the .22 and slightly more powerful….though not much.

The ACP stands for “Automatic Colt Pistol.”  There are quite a few guns that use this size but the ammo is more expensive and you’re not getting too much added benefit other than the inherent reliability that comes with center fire casings.

Slightly more stopping power than the .22 but it’s kind of like the difference between stabbing someone with an ice pick or a knitting needle.

Both do the job, but one will leave an ever so slightly larger hole.  It’s a tiny round and I’ve yet to use a .25 caliber gun that didn’t work like crap.  I’ve used a few flawless .22’s, however.  I don’t know why that is.

Price: ~20 cents

.380 ACP

Now we’re getting into the beefy sizes.

Personally, I would never use a gun with anything smaller than a .380 as my primary carry weapon.

Sometimes called a “9mm Short”, it has seen a major boost in popularity recently thanks to the various “pocket pistols” that have come on the market.  This is also a very controversial round.   If you ever want to troll a gun forum, just go there and ask “which is better: a .380 or a 9mm?” or “Does a .380 have enough stopping power to use it as a carry?”  Watch the arguments start.

It’s entertaining.

This bullet has relatively low recoil and, at close range, good penetration.

They’re a great carry weapon size, in my noobish opinion.  Gun author Massad Ayoob once said of the .380 “Some experts will say it’s barely adequate, and others will say it’s barely inadequate”.  This is a low power round.  Because of the nature of the bullet and the guns that shoot it, it’s going to be relatively useless beyond close-ish range.

Price: ~30 cents


This pistol round is officially known as the “9x19mm Parabellum” or “9mm Luger” to distinguish it from other 9mm rounds, but you will be fine just saying “nine millimeter” or “nine mil” for those in the know.

My personal favorite and if there was a “Goldilocks” round, this would be it.

The very first gun I bought was a 9mm.  They’re fun at the range. They’re good for defense.

Believe it or not…or actually believe it because it’s true…the 9mm bullet is the same size as the bullet used in the .380 and the .38 Special. The only difference between the three is the amount of gunpowder behind it.

It is the standard round for NATO countries and the majority of police forces around the world.  It is mild shooting, can vary in weight from 115-147 grains, and has varying stopping power based on type of bullet (hint, go with hollow points).

Ballistics Gel Testing
Ballistics Gel Testing

The rounds are inexpensive and they have very low recoil.  Many, many guns use this size as well.  A compact 9mm gun can be used for concealed carry.  Most of the guns that use this size can hold on average 15-17 rounds in the magazine.

Price: ~25 cents

.40 S&W

Remember how I said the 9mm was the “Goldilocks Round”?  If that’s the case then the .40 is her big, angry, whiskey drinking sister.

Originally designed for the FBI as a reduced 10mm cartridge and popular with other law enforcement agencies ever since.  More kick when compared to the other popular handgun cartridge, the 9mm.  Weights of the bullet can vary from 155 to 165 and 180 gr.   Ammo is still relatively inexpensive.

Note that the FBI recently decided to move back to the 9mm since agents are able to shoot more quickly and more accurately with 9mm compared to the .40 S&W.

Price: ~30 cents

.45 ACP

Designed in 1904 by Mr. John Browning himself for the famous 1911 pistol, this round has one heck of a history.

This thing is a big bullet with stopping power to spare.

The choice of many police officers and military personnel for years, the .45 caliber round has proven itself time and time again. I could probably do an entire article on just this bullet.

It has a large bullet of around 230 grains and has moderate recoil.  I can tell you from personal experience that this is not a round to hand to someone who’s never fired a gun before.  Its stopping power is renowned and has a nostalgic following.  Our recommendations for the best ammo for practice and self-defense.

Price: ~40 cents

.38 Special

The “thirty-eight special” is most commonly found in revolvers.

It has manageable recoil but is still quite a handful when in a very light/small revolver.  It has a longer cartridge and more powder in said cartridge but it is a slower, heavier bullet than the 9mm.  The FBI used this cartridge as its standard issue for a very long time.

The .357 Magnum is identical to the round except for being slightly longer.  You can safely fire a .38 Special in a .357 Magnum gun, but don’t try the other way around due to size and pressure constraints.  Bullet weights vary from 110 to 132 to 158 gr.

Price: ~50 cents


The Soviet round used in the AK-47 line of rifles.  It has moderate recoil, great knockdown power, and a bullet weight of usually 123 grains.  There is a high availability of military surplus ammo which makes the round very affordable.

Price: ~20 cents

.223 / 5.56x45mm

The “two-two-three” (inch) Remington has almost the exact dimensions as the “five-five-six” (mm) NATO cartridge.

The 5.56 has higher pressures than the .223, so .223 rounds can be fired in a 5.56 rifle, while 5.56 rounds should not be fired in a .223 rifle.  Bullets are around 55 grains and the cartridge has light recoil.

It is the ammunition used in the M16/M4/AR-15 line of rifles and there’s still endless debate on its effectiveness in combat.  However for civilian shooters who get the benefit of hollow point ammunition…

Price: ~30 cents

.308 / 7.62x51mm

The “three-oh-eight” (inch) Winchester is almost the same dimensions as the “seven-six-two” (mm) NATO round.

There are special considerations when mixing the rounds but unless you know what you are doing, stick with the round intended for your rifle.

It is a popular hunting round with moderate recoil, high stopping power, and a wide range of bullets available from 150 to 208 grains.

Price: ~75 cents

12 gauge

The most popular shotgun round.

20 gauge is a smaller round while 10 gauge is a much larger round.

Recoil can vary from moderate to high based on round.  Shotgun ammunition is the most versatile with birdshot (lots of smaller metal balls), buckshot (fewer much larger metal balls), and slugs (1 oz piece of solid metal).  Stopping power is renowned with buckshot and slugs.

Price: ~25 cents for birdshot to $1 for others

.50 BMG

Not really common for civilians, but I just had to have it in here.  It’s huge and has huge recoil with awesome range (confirmed kills at 2000m+), and you definitely don’t want to be on the receiving end of the bullet.  660 grains of pure stopping power.

Price: ~$3.00

Common Bullet Types & Terminology

Still with me?

I’ll go over rarer types of calibers at the end of the article, since I really want you to learn about the common bullet types first.

Full Metal Jacket (FMJ)

This is the most common type of bullet and consists of a soft core metal, such as lead fully encapsulated by a harder metal, such as copper.  They are usually pointy, round, or even flat.  Wound channels are typically small and go through a target.

Great for the range but not preferred for defensive rounds.

Hollow Point (HP)

Hollow points are made to expand once they hit something.  They are the go-to round for police officers, concealed weapon carriers, and home defense guns because of their stopping power.

Below you can see the difference between a round nose 9mm FMJ and a hollowpoint:

9mm 115 gr Federal FMJ vs 124 gr Federal Hydrashok, Top
9mm 115 gr Federal FMJ vs 124 gr Federal Hydrashok, Top


Open Tip (OTM)

Open tip bullets look like hollow points since they have an opening at the top, but this is more because of their manufacturing process.  The openings are too small to expand effectively.

Regular FMJ’s are created from small copper cups where the bottom of the cup becomes the tip of the bullet.  Open tip bullets are the opposite, with the bottom of the cup becoming the bottom of the bullet.

7.62x39 FMJ vs Open Tip, Top
7.62×39 FMJ vs Open Tip, Top

Open tip bullets are sometimes also known as Open Tip Match (OTM) since they are preferred by long distance shooters.  The manufacturing process for open tip bullets create a more consistent round than FMJ.  Important when you’re shooting hundreds of yards!

To make things more confusing, several manufactures such as Sierra still call their open tip rounds “hollow point.”  If it is important to you, it is best to check online or call.

Ballistic Tip

This is what you get when you combine the aerodynamics of a FMJ with the stopping power of a hollow point.  This is a hollow point covered with plastic to mimic the profile of an FMJ.  They are usually used in hunting.

Below you’ll see that the bottoms of the bullets are more streamlined.  This design is called “boat tail” and produces less drag as the bullet flies through the air.  HPBT is short for “hollow point boat tail.”

7.62 208 gr Ballistic Tip vs 175 HPBT
7.62 208 gr Ballistic Tip vs 175 HPBT
5.56 FMJ vs Open Tip vs Ballistic Tip, Side
5.56 FMJ vs Open Tip vs Ballistic Tip, Side

Soft Point

This is an earlier attempt to get the ballistic advantages of an FMJ with better expansion.

In soft point bullets, part of the lead is exposed at the tip.  The softer lead is designed to flatten better when the bullet hits a target.  But for the most part, ballistic tips have surpassed the performance of soft points.

Note that the left and right bullets are boat tail while the middle one is not.

Soft Point Bullets
Soft Point Bullets

Bird Shot

We’re back to shotgun rounds.

Shot Size Chart, Shotgunworld
Shot Size Chart, Shotgunworld

Bird shot consists of the top row and are pretty small pellets numbering in the dozens in each shell.  Here’s a 7.5 shot shell with a clear hull.

12 ga Birdshot
12 ga Birdshot

Great for hunting birds and blasting clay pigeons, but not the best for home defense.

Buck Shot

The overall best home defense round is buckshot.  00 (“double-aught”) is the go-to load.

00 Buckshot, Paracles Tech
00 Buckshot, Paracles Tech


Slugs are single projectiles that are around 1 oz of solid metal that really bring the hurt.  However, they don’t have the spread of bird shot or buck shot.  But, in the hands of a solid shooter, they can be accurate up to 100 yards.

12ga Slug
12ga Slug

Components of Common Cartridges

What makes up a cartridge?

If you get into shooting, you’ll see the costs can really add up.  That is when you get into reloading your own ammo.  Here’s just a couple breakdowns of the calibers I currently reload.  You can see the difference in powders & bullets for each type.

Components of 124 9mm FMJ
Components of 124 9mm FMJ
Components of 55 gr 5.56 FMJ
Components of 55 gr 5.56 FMJ
Components of 175 gr 308 HPBT
Components of 175 gr 308 HPBT

Less Common Bullet Calibers

Let’s quickly go over the remaining 8 calibers I have on hand:

Common Bullet Sizes
Common Bullet Sizes


If you remember, the .40 S&W is just a cut down version of the 10mm which is pretty tough to handle and not something I want to be shooting all day at the range.

Which is just the reason the FBI downgraded from the 10mm to the .40 S&W (and now to the 9mm).  Great stopping power and harsh recoil.

Price: ~60 cents

.40 S&W vs 10mm
.40 S&W vs 10mm


Made by FN for their P90 personal defense weapon (PDW) and Five-Seven (get it?) pistol.  The small bullet (23-31 gr) travels very fast and allows for increased penetration with low recoil and high magazine capacity.

Price: ~50 cents

.357 Magnum

A beefed up .38 Special almost exclusively for revolvers.  Great reputation for stopping power but at the cost of some decent recoil.  Bullets vary from 125 to 158 to 180 gr.

Price: ~80 cents

.38 Special vs .357 Magnum
.38 Special vs .357 Magnum

.30 Carbine

Light rifle round designed for the M1 Carbine that was introduced in the 1940s.  Used in service even up to the Korean war, the round and rifle still have a popular following in the civilian world.  The standard bullet is 110 gr.

Price: ~40 cents

.300 Blackout

Designed to give the ballistic performance of the larger .30 caliber AK 7.62x39mm round but designed for the AR-15 and using standard magazines at normal capacity.  Thus, the case is a shortened 5.56 case to fit reliably.  Getting more popular as it is a great round for suppressed shooting out of short barrels.  Bullet weight ranges from 110-220 grain.

Price: ~70 cents

.300 Blackout vs 5.56
.300 Blackout vs 5.56


Designed by the Russians for their Mosin-Nagant, the round is still in use today in the Dragunov and other sniper rifles, which makes it the oldest cartridge still in combat use.  Slightly more recoil than a .308 Winchester.  Bullet weight is around 140-200 gr.

Price: ~60 cents

.30-06 Springfield

The “thirty-aught-six” is a one of the US’s oldest cartridges, introduced in 1906 and the primary military ammo for almost 50 years.  Strong recoil, and with it range, but tolerable by most shooters which makes it still beloved by many shooters around the world.  Bullet weight is around 150-180 gr.

Price: ~$1.50


There you have it…now you’re a bullet pro!  Continue on with our Beginner’s Guide to Guns or head on over to see where to buy some ammo online.

Happy shooting!


  1. This was amazingly written and extremely descriptive. Thank you so much!! I loved the pictures and side by sides a lining with prices. Just and all around precise and very well. Written article on caliber sizes. Thanks alot!

  2. Great article. It answered my question as to why the FBI went from 10mm to the .40 S&W, and now to the 9mm rounds.

  3. I am learning about guns but having to depend on clerks in order to buy correct ammo for our guns. I have two size handguns and a variety of boxes of rounds right now. I was clueless on the differences. We also gave a shot gun. Your article was an easy read with excellent illustrations. I will check out your YouTube channel in the future…will recommend.

  4. The is a lot of history here and thank you for the time you you you you site… I do have a question though.

    In your breakdown of terminology (IE: five-five-six) I don’t see what that means… what is 5.56 x 39?? Or 30-06??

    1. Hi Nate, if you see something like 5.56x45mm, that’s the dimensions of the cartridge. The 5.56 deals with the diameter of bullet while the 45 is the height of the shell. The 30-06 is a little different in that the .30 is the caliber of the bullet (size) and 06 is the year the cartridge was adopted (1906).

  5. I recently inherited a pump action Remington 760 in 300 savage caliber without any magazines. As you can imagine not alot of places carry those magazines in that specific caliber. I was wondering if you can tell me what caliber is the closest to the 300 savage so I might be able to find a magazine the will be functional if not perfect.
    Thanks in advance,

  6. OMG! Finally someone who makes sense to me. Trying to learn stuff on your own or at gun shows and gun shops is wearing me down. I have been shooting all my life (north of 60 years), but being female, I get talked down to a lot and so just grab the ammo that is familiar to me and go. I have checked web sites on bullet strengths and sizes before and never got anywhere. Now I feel I have a grasp of at least the calibers you went over. I have book marked this page as I am sure I will re-read it many more times until it all stays in my memory banks. Thank you, thank you, thank you. Please do more.

    1. I am also a femal shooter (only a year now) and I had the same problem. I got talked down to at a gun range. I asked questions and they would address my husband with the answers!! My husband finally had enough and we left. Thankfully I was able to find another one that has been amazing! The articles here just top off everything I’ve been learning and more!

  7. Thank you Eric for this great info.
    I’m planning to add range shooting to my hobby in the future, and thankfully I saw your article and learned a lot.

    My one question is, is there going to be a mixed up when buying bullets for a handgun, say I bought a certain type of bullet then later found out that it won’t fit? What question should I ask the gun store when buying bullets for a particular gun if I ran out of ammo?

    Also, I haven’t fired any gun before, so based on your article, .22 is the best for a total newbie. But I plan to get just one handgun for sport and self-defense, so I’m hoping to have 9mm instead since I don’t want to own more than 1 gun. Is this okay, cost-wise (bullets)?


  8. Thanks for the very good rundown on bullet types. As a total newcomer to guns, I found this page incredibly helpful.

    The only part I take issue with is regarding the .45 round, you say:

    “I can tell you from personal experience that this is not a round to hand to someone who’s never fired a gun before.”

    I recently shot for the first time, and it was with a Colt 1911 .45 and it was frickin’ awesome! I can’t imagine shooting any other kind of handgun. I even hit the target (most of the time – my one-handed shooting needs work). It inspired me to set up a range on my property and I’m shooting every weekend now.

    Yeah, the 45 packs a wallop, but if you have a gun with enough heft, and you hold it firm, the punch is more like a push. For a first timer it might be big, but with the right instruction, it’s a great experience shooting a piece of history.

    Thanks again for the very helpful information.

    1. Hi Joe, good question…HP stands for hollow point while JHP stands for jacketed hollow point. Almost all good self-defense ammo is JHP while there’s some unjacketed lead hollow points in revolver calibers (such as .38 Special). XTP I think is just a brand from Hornady that stand for “Extreme Terminal Performance”.

    1. A 5 inch (127 mm) would be 5.00 caliber. The 54 refers to the barrel length (54 calibers long or about 270 inches).

      A .38 barrel is 0.38 inches in diameter

    1. The 7mm Rem Mag is a much faster, flatter shooting round. It is a .284 bullet diameter that is usually 150-175 gr.

      The 308 Win is a .300 bullet in a non-magnum case. It shoots slower and has a more parabolic trajectory. Typically the bullets are also around 150-175 gr..

      I shoot long range (500-750yds) and elk with my 7mm, I shoot shorter ranges (100-500yds) and deer with my 308. Which is better? They are different and both very good at what they do.

      They are kind of an apples/oranges comparison. I would suggest of the two, the 308 is a better all around caliber; especially for a beginner. The 7mm has far more recoil, and is better compared to a 300 Win Mag.

  9. I have a Thompson Center Encore .243. The .243 is not covered in your bullet size calibers guide. Can you tell me your take on this caliber?
    Thank you.

  10. Are you taking pictures with a cellphone? Whatever you are doing the pictures of your bullets are distorted. They do not give accurate depiction of their actual size of calibers listed. They are elongated and thinly proportioned. i know the difference in most shells but there are alot of people that will be greatly surprised at the true size of lets say .357 or 45 long colt as opposed to .45 acp. Your picture of a .50 caliber bullet makes it look no bigger than a 30-06. there is a huge difference you can not see in your so called photos.

    1. Hi Richey, thanks for your comment. I do admit I’m not the best photographer but I tried to not use a potato camera. Hopefully the quarter in the pictures gives some sense of scale.

  11. Total newbie. Great article…
    In terms of defense, what round type or classification would be best for close quarters (townhouse) with less wall penetration? Frangible?

    1. Hey John, yup! I have caliber specific ammo recommendations on the site so check them out. Use the contact us page if you’re having trouble finding it.

  12. Just starting out learning about guns. all the ammo stuff was slightly confusing, but your articles totally cleared it up. Thank you very much.

  13. Eric what is the difference between 223 and the 5.56×39 and if I can witch one for the other I have two old arisaka and I need to know what caliber they are can you help me

    1. Hey Carl, the .223 is close to the 5.56×45. I’m not familiar with a 5.56×39…do you mean 5.45×39 which is the standard round for the AK-74. I’m also not familiar with arisaka’s so you might have better luck in a forum or bringing it to a smith. You don’t want to put the wrong caliber in a gun.

      1. It shoots great out of my RIA 1911 with 5in barrel, sometimes you get a fireball. The velocity is about 2100 -2400 FPS but hardly any recoil. Out of the rifle the FPS goes up to 2700 FPS, you can tell it has some power but still not much recoil when you pull the trigger. You need to check it out on the RIA website. They even make a conversion kit for a Glock 9mm to convert it to the new cartridge.

  14. Very helpful article. My husband has many guns and has used guns for about 45 yrs. Now I finally feel I understand some of what he talks about. I am just beginning to shoot. I pulled up multiple articles to try to educate myself a little more and this was the only one I could read start to finish because it made sense. Thank you.

  15. Hi. Great article. But I still have a question you may be able to answer for me. Some years ago my late dad owned a Smith and Wesson that had been made in Spain in the 1930’s. It was a five shot revolver, break open, and we thought it was a .38. We took it to the police in the days when they still used .38’s and the cop took a cartridge from his speed loader. It slid into one cylinder in the gun, but the length of the cartridge made it impossible to close the gun. So what calibre could this Spanish made S & W revolver be? The cylinder takes the width of a .38 cartridge but not the length. Any ideas on what caliber of bullet this antique Smith and Wesson made in Spain in the 1930’s might actually use?

    1. Hey Carl, I’m not sure…not the best authority on foreign revolvers. You might try your local gun shop or post up some pics on forums.

  16. I am just really surprised to not see the .270 win on the list. It is a great all around round that is more common then some listed. With thay said I did like the article and did get some info out of it.

  17. Great article,I wished you had included the .338 Lapua and the .338 Winchester, but perhaps that s beyond your readers curiousity,still a great article.thumbs up.

  18. Hi Eric, a little background I am retired cop and started out with a 38 revolver went 2 in 9 and then to a 40 Auto. Now there is talk that the department is going back to a 9 as a result of studies stating there is less recoil on the nine as well as lighter in weight smaller in size and less expensive to shoot. What are your thoughts? Thanks in advance for your response I respect your opinion.

    1. Hi Robert, I love my 9’s for those reasons you mentioned. Also the new tech in 9 hollow points make them pretty effective.

  19. This is the most informative article I have read about ammunition. Complete, concise and easy to follow! I teach firearms training to civilians, law enforcement and security officers, and covering ammunition has always been a task because of all the variations of ammo. Thanks for making it easier to explain.

  20. Hi Eric,

    This might be a bit specific, but do you know if the cartridge case wall thickness may vary for the same calibre?

    I’ve read that cartridge casings occasionally are made out of different materials, wouldn’t that require different dimensions?

    1. It does based on manufacturer. Sometimes reloaders will segment their brass based on manufacturer since it makes enough of a difference. You’ll see brass, nickel plated brass, steel, etc. Not sure if those would require different dimensions.

    1. My guess is it’s just a naming convention. They are marketing the M-22 ammo more towards rimfire AR rifles so they might have added the M for some M4/M16 association. Just guessing.

  21. Great article. Couple of corrections?
    the 9mm is not the same size bullet as the .380 or the .38 special. It’s actually about .36 caliber. Slightly smaller and the .30 Caliber carbine was used way past Korea, up to the late mid-60’s in the Vietnam war.

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