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caliber
In guns, particularly firearms, caliber or calibre is the approximate internal diameter of the barrel, or the diameter of the projectile it fires, in hundredths or sometimes thousandths of an inch. For example, a 45 caliber firearm has a barrel diameter of .45 of an inch. Barrel diameters can also be expressed using metric dimensions, as in "9mm pistol." When the barrel diameter is given in inches, the abbreviation "cal" (for "caliber") can be used. For example, a small-bore rifle with a diameter of 0.22 inches can be referred to as .22 or a .22 cal; however, the decimal point is generally dropped when spoken, making it a "twenty-two caliber" or a "two-two caliber rifle".
In a rifled barrel, the distance is measured between opposing lands or grooves; groove measurements are common in cartridge designations originating in the United States, while land measurements are more common elsewhere. Good performance requires a bullet to closely match the groove diameter of a barrel to ensure a good seal.
While modern cartridges and cartridge firearms are generally referred to by the cartridge name, they are still lumped together based on bore diameter. For example, a firearm might be described as a "30 caliber rifle", which could be any of a wide range of cartridges using a roughly .30-in projectile; or a "22 rimfire", referring to any rimfire cartridge using a 22-cal projectile.
Firearm calibers outside the range of 17 to 50 (4.5 to 12.7 mm) exist, but are rarely encountered. Wildcat cartridges, for example, can be found in 10, 12, and 14 cal (2.5, 3.0, and 3.6 mm), typically used for short-range varmint hunting, where the high-velocity, lightweight bullets provide devastating terminal ballistics with little risk of ricochet. Larger calibers, such as .577, .585, .600, .700, and .729 (14.7, 14.9, 15.2, 17.8, & 18.5 mm) are generally found in proprietary cartridges chambered in express rifles or similar guns intended for use on dangerous game. The .950 JDJ is the only known cartridge beyond 79 caliber used in a rifle.
In some contexts, e.g. guns aboard a warship, "caliber" is used to describe the barrel length as multiples of the bore diameter. A "5-inch 50 calibre" gun has a bore diameter of 5 in (12.7 cm) and a barrel length of 50 times 5 in = 250 in (6.35 m).
I have for sale 2 brand new HKS speed loaders for .38 and/or .357 caliber revolvers.
(2) #36-A for 5 shot revolvers such as S&W, Charter Arms or Taurus
Price is only $5 each
Hi everyone,
I am selling a Ruger Mark I .22 Caliber Pistol. It is in excellent used condition, serial number 793xx, comes with one magazine and hard plastic gun case, asking $450 OBO (Buyer pays FFL transfer fee).
Can meet at FFL of your choice in the Pierce or King County area. If you do not...
Florida Shootout: 70-Year-Old Homeowner Kills 18-Year-Old Intruder
Looks like 2 .45s to the chest are fatal... 1 .40 to the chest and 1 to the abdomen is not.
Did these guys just settle the great caliber debate for us? ;)
:s0097:
But really, glad to see the good guy come out on top and...
Mostly unnecessary backstory: I'm building a new house and one of my parents' good friends is acting as general contractor at a substantially reduced rate. Almost as a favor, really. I'd like to give him an AR15 as a small thank you. As a little extra, I was thinking of including an additional...
Looking for a SIG CALX-226-9-BSE
(9mm Elite)
I've looked high and low on the Interwebz.
Seems like a special order unless you want to pay full retail (+).
I'd like to pay around $320 and I want the Elite version.
I set out to build a 9mm Glock mag pistol. This one has a 5" TROS 3 lug barrel to use with my TiRant 45 silencer and triad mount. Got all the parts together and assembled today. Unfortunately I neglected to check the ID of the forend when I ordered it and yep....The silencer doesnt fit. Oops...
Not much to say about these, they were an experiment with MKS. While the guns themselves were perfectly serviceable, me and the owners of the factory did not click, and I moved onto a superior alternative. All five are functional and proofed by IOF, all five have bayonets and scabbards, and all...
Considering having a couple pistol caliber lever actions threaded for suppressor use. Have a Marlin 1894 45 Colt, and considering getting either a 1894 Marlin .357 or a Henry Big Boy Steel Carbine in .357. Is there anyone around locally who does this operation?
PRICE REDUCED - $300 OBO - SOLD $300
My first career job was in Jackson Hole, WY. Man, twist my arm off and beat me! While living there some 37 years ago, got interested in black powder guns because my friends who were part of the Mountain Man club told me it'd be a blast. So, hang on to your...
Selling an excellent condition Navy Arms black powder pistol. It is the Naval Model in .36 caliber, and was purchased in the mid-1970s. It has a 7.375" octagonal blued barrel, steel color-cased hardened frame, brass guard, walnut grips, and has top strap/post sights. It is 13.5" in length and...
Okay, long story short I have been looking into getting my first rifle and know that I want to get a Remington 700 mainly for the accuracy and reliability. I thought long and hard about this but wasn't sure if it would be worth it so am asking for everyone's sage advice. I originally had the...
I have about 750 rounds of Tula 180 grain 40 caliber ammo I’d like to sell at $10 a box. It’s been stored inside in an ammo can. I also have 3 thousand rounds of Winchester and federal 180 grain brass ammo I’d like to sell also at $12 a box. I’ll get pics up later
Below is an excerpt from OregonLive on the UCC shooting. I copied it in case the reporter got a clue. Anyway apparently you can buy .389 caliber handguns. For $163 it must have been a Hi Point. The crux of the article is that the new law that Boquist sponsored would have prevented it.
By...
For sale is a .50 caliber Hawken rifle. There's nothing wrong with this one other than the brass is tarnished. As you can see from the photos, it has an interesting star brass boss inlaid into the stock, which I found interesting. Never seen that on any other firearm. Other than that I find it...
This rifle is beautiful aside from the rather obvious bit; the lockplate and hammer are covered in surface rust. Another project gun that I simply don't have time for. But other than that, it's almost flawless. Most of the bluing is in place, the stock is very pretty, nice brasswork, etc.
$150...