Join the #1 community for gun owners of the Northwest
We believe the 2nd Amendment is best defended through grass-roots organization, education, and advocacy centered around individual gun owners. It is our mission to encourage, organize, and support these efforts throughout Oregon, Washington, Idaho, Montana, and Wyoming.
Discuss firearms and all aspects of firearm ownership
Join others in organizing against anti-gun legislation
Find nearby gun shops, ranges, training, and other resources
Discover free outdoor shooting areas
Stay up to date on firearm-related events
Share photos and video with other members
...and much more!
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).
Convert your .40 P226 to 9mm with this full upper featuring night sights, barrel, guide rod etc and 1 15 round factory mag. New these are $409 on Sig's website and very hard to find. No FFL required .Yours for only $265 or trade for brass factory 9mm and some .45. No steel cased. Acceptable...
Full upper slide, barrel, guide rod etc for Sig p226 in 9mm with a 15 round magazine. Turn your .40 into a 9mm with this kit. New they retail for $407 and are hard to find. Yours for only $265. No FFL required. I travel I-5 regularly from Salem to Tigard. Call or text Dan at...
Hello Gentlemen (and Ladies),
I've lurked on NWFA for a couple years now, and have learned so much about firearms in general. I recently asked a question in the Ammo/Reloading forum and got a bunch of great responses, so I'm feeling more comfortable asking for opinions on the following topic...
Looking for Dillon Square Deal B caliber conversions and tool heads, if available for .380 acp, .40 S&W and 9mm Luger. Message or call/text 4oh6-9five1-oh3oh1.
Thanks,
Randy
Looking for calibers .380 acp, .40 S&W and 9mm for Dillon Square Deal B. Message or call/text 4oh6-9five1-oh3oh1, thanks,
Randy
sorry, just found the WTB section, not sure how to delete this one?
So, we've been experimenting with various very diminutive automatic carbines for my better half. She is only 5'1" tall and has hands like a child. She can run a 10/22 like no nobody's business, but it is a .22, and many other carbines are too large, produce too much recoil, or both, for...
I was looking at a lot of data regarding MSR calibers and their effectiveness on medium game like Blacktail Deer and Coyotes. Looks like I've been out of the gun magazines to long and there seems to be quite a few chamberings that do really well in the MSR15 platform (AR15 is so 2008). These...
I looking to get an idea of the masses opinion on using 6.5 Creedmore as general purpose hunting caliber for non-dangerous game in the lower 48 states up to and including elk. The 6.5x55 is basically the Euro 30-06 and has slain a lot of beasts on that continent.
I plan on getting a precision...
Looking for $4,500.00 for this matched serial number, full set of 12 with Display Case.
1965 KANSAS COW TOWN SERIES
Wichita Scout, 176KW
1967 KANSAS TRAIL SERIES
Chisolm Trail Scout, 176CH
1970 KANSAS FORT SERIES
Ft. Hays Scout, 176FH
1966 KANSAS COW TOWN SERIES
Abilene Scout, 176KA
1968...
I have a 1851 Navy with the brass frame in 44 caliber for sale. In working order and good to very good condition made by ASM I'm sure of the year of manufacturer as I can't find a serial number look up on Armi San Marco replicas.
$145
IMG_E1332 by C B, on Flickr
IMG_E1330 by C B, on Flickr
I have a low round count ~250 rds Remington LTR that is threaded 9/16x24 with 20 MOA picatinny scope base that I'd like to trade for a Tikka T3. I'm in Tri-cities.
18" stainless medium profile mid length gas
Birdcage, bolt, extractor, magazine.
Shot Less than 140 rounds.
since this ids a type 1 the bolt/extractor will make it into a 7.62x39 bolt too!!
This will make your AR into a Washington State legal deer rifle. It's a hot little round.
I decided that i...
This video uses the data from Greg Ellifritz's 10-year stopping power study of real-world gun fights to shed the light of actual data on several common beliefs about handgun calibers including: 22 rifles are the best bug out guns, 45s have the best stopping power, 380s are too small to be...
I actually bought these two some time back, and when I got around to testing them....... I got a big surprise.
The caliber is .327 Magnum. Chrono showed a MV of 1,360fps. The stated ME is 425lb! In a hollow point the stats are better than the 9mm and the .38spl +P Perfect for my girls in the...
New unfired sig sauer caliber xchange for P226. Converts a 226 to 9mm. Inculdes Sig night sights and one magazine. Sig part number Calx-226-9- BSS. *Sold
Nosler 22 Caliber (.224) 64 gr Bonded Solid Base Bullets, 100 ct.
Mfgr. Part# 38135
100 ct. factory sealed boxes, I have a total of 10 boxes for sale.
These are NOT BLEMS.
Cash Only, No Trades, FTF in Salem Area
Option 1, Buy all 10 Boxes - $225.00
[$22.50 per box, 1000 ct. bullets total]...