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calibers
In guns, particularly firearms, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel bore - regardless of how or where the bore is measured and whether the finished bore matches that specification. It is measured in inches or in millimeters. In the United States it is expressed in hundredths of an inch; in Great Britain in thousandths; in Europe and elsewhere in millimeters. For example, a "45 caliber" firearm has a barrel diameter of roughly 0.45 inches (11 mm). Barrel diameters can also be expressed using metric dimensions. For example, a "9 mm pistol" has a barrel diameter of about 9 millimeters. Due to the fact that metric and US customary units do not convert evenly at this scale, metric conversions of caliber measured in decimal inches are typically approximations of the precise specifications in non-metric units, and vice versa.
In a rifled barrel, the distance is measured between opposing lands or between opposing grooves; groove measurements are common in cartridge designations originating in the United States, while land measurements are more common elsewhere in the world. Measurements "across the grooves" are used for maximum precision because rifling and the specific caliber so-measured is the result of final machining process which cuts grooves into the rough bore, leaving the "lands" behind.
Good performance requires a concentric, straight bore that accurately centers the projectile within the barrel, in preference to a "tight" fit which can be achieved even with off-center, crooked bores that cause excessive friction, fouling and an out-of-balance, wobbling projectile in flight.
While modern firearms are generally referred to by the name of the cartridge the gun is chambered for, they are still categorized together based on bore diameter. For example, a firearm might be described as a "30 caliber rifle", which could accommodate any of a wide range of cartridges using a roughly 0.30 inches (7.6 mm) projectile; or as a "22 rimfire", referring to any rimfire firearms firing cartridges with a 22 caliber projectile. However, there can be significant differences in nominal bullet and bore dimensions, and all cartridges so "categorized" are not automatically identical in actual caliber.
For example, 303 British firearms and projectiles are often "categorized" as ".30-caliber" alongside several dozen U.S. "30-caliber" cartridges despite using bullets of .310–.312″ diameter while all U.S "30-caliber" centerfire rifle cartridges use a common, standard .308″ bullet outside diameter. Using bullets larger than design specifications causes excessive pressures, while undersize bullets cause low pressures, insufficient muzzle velocities and fouling that will eventually lead to excessive pressures.
Calibers fall into four general categories by size:
Small-bore refers to calibers with a diameter of .32 inch or smaller
medium-bore refers to calibers with a diameter between .33 inch up to .39 inch
large-bore refers to calibers with a diameter of .40 inch or larger
the miniature-bore historically refers to calibers with a diameter of .22 inch or smallerThere is much variance in the use of the term "small-bore", which over the years has changed considerably, with anything under .577 caliber considered "small-bore" prior to the mid-19th century.
I had a friend give me an absolute boat load of bullets and these are the items that I don't have a specific need for. I will break into smaller quantities within reason, but would prefer to sell full boxes, plus shipping is cheaper that way. Buyer pays USPS cost. I have more detailed pictures...
Remington, .22 Long Rifle, 1997 2nd Edition Racecar Tin, Variety Pack of 7 boxes, different bullet and load variations of Remington .22LR (22 Target, Thunderbolt, Cyclone, Viper, Yellow Jacket, Golden Bullet, and Golden Bullet Hollow Point), box is pretty solid with good color, some corner wear...
Hello All, Multiple ammo calibers are for sale. >> Location - Bellevue, WA
Will not separate boxes—discount for someone to take all of it.
7.62x39 Wolf WPA 124GR Steel Non-Corrosive $0.45 per round, 500 Rds, $225
40 S&W PMC Bronze 180 FMJ $0.25 per round, 300 Rds, $75
45 S&W Winchester 230...
Hello,
This is a box of ammo I bought at an estate sale/garage sale at the height of the pandemic/riots when ammo was hard to find. I bought it for the 7.62x39 that came with it. Has sat in my closet the last few years just taking up space. I learned later this is all probably reloads (I was...
This was a fun project that turned out great. However im switching over completely to just 45 and I'd rather have a 1911.
Setup to run 45acp, 45acp +p, 45super, and 10mm. If you've never heard of 45 super it's basically 45acp +p++. Giving it 10mm power. Super cool round. Underwood, Buffalo bore...
Hey All! I was wondering what would be the process of making a custom caliber.
I was watching the YouTube and a video concerning Nano Sonics. It was a .338 bullet in a 10mm auto case. It was a subsonic only bullet and the reasoning as far as I have found was to use the most uniform amout of...
NOTE: This ammo has been stored inside for an extended length of time.
***Some of it needs to be cleaned before using it.***
A close friends son passed away and she wants everything gun related sold. Everything is located in Benton City, Washington.
If it's listed as factory, then it's factory...
A close friends son passed away and she wants everything gun related sold. I'm starting with the pistol ammo,. Everything is located in Benton City, Washington.
If it's listed as factory, then it's factory loads. If it's not listed as factory, then the ammo is for components.
No desire to ship...
Dead Air Suppressor end cap fits calibers 5.56 & .223.
This item is brand new in manufacturer packaging.
I paid $69 from Silencer Shop plus tax & shipping. $50 (price includes shipping)
I accept Paypal only for payment & will ship item within one business day of payment.
I've recently...
Hi I am selling some ammo given to me by someone whose spouse passed away. Make me a reasonable offer!
100rnds of 120gr .45 colt
50rnds of 12 gauge 7 1/2 shot
18rnds of 270 Win
20rnds of 30-06
15rnds of .410 6 shot
70rnds of 9x18 makarov (50 of the JHP)
Selling them all together please
Looking to purchase some NEF rifles if anyone has some they want to get rid of. Not looking for shotguns unless it’s a 10 gauge. More looking for rifle calibers in 45-70, 30-06, 308, 7mm express, 243. You can PM me or respond to this post. Would be willing to pay between $300-$400 depending on...
More estate stuff for your perusal. All used unless stated otherwise.
Will ship at cost.
PM me please.
Quantities in parentheses.
25-06 .25 ea (270) SOLD
243 .25 ea (275)
338 Win Mag .30 ea (500) SOLD
375 H&H .50 ea (82) SOLD
454 Casull .25 ea (100) SOLD
358 Win .50 ea (100)
270 .20 ea (100)...
284, 44 mag, 30-30, 257, 300 Wby, 250 Savage, 405 Win, 30-06, 243, 350 Rem Mag, 22-250, 30-378, 7mm Mag. Longview area. Not wanting to ship. Prices in the pics. I'd make you a good deal if you bought them all.
Looking for a 7mm rem mag bolt action browning blr lever action browning bar semi auto might be interested in other calibers also Trade only! Ask any questions 253-304-7685
HORNADY
22-250 REM
X
$35.00
w/ BRASS
RCBS
22-250 REM
X
$25.00
W/ BRASS
RCBS
220 SWIFT
x
$25.00
W/ BRASS
REDDING
300 PRC
X
$200.00
NECK SIZING COMPETITION (1OF2) W/BRASS
REDDING
300 PRC
X
COMPETITION SEATING (2OF2) PACKAGE OF NEW BRASS
RCBS
338 WINMAG
X
$25.00
W/...
Doing a lil cleaning up in the reloading room. Prices Do Not nclude shipping.
* PM with inquiries..
(130) .257 115 VLD $78.00
(39) .257 115 TSX ** SOLD **
(100) .257 Speer 100 SP $25.00 ** SOLD **
(120) 6.5mm 120 Gold Dot ** SOLD **
(105) .277 130 VLD $63.00 ** SOLD **
(164) .277 140 SGK HP...