can someone explane how bullets are measured ? I know calaber but is it metric ? tenths ?how does the?

Question

math work ?

Answer 1

Caliber is measured in tenths of an in.... .17hmr .22lr .223, .270, .30 .40 .45 etc. Those are in thenths of an in diameter, meaning from the rear of the projectile you can measure from one side of the bullet to the other & it will be that wide... like wise the .50 caliber is 1/2in in diameter bullet, making it one of the largest ammos in a handgun...

Some of the largest bullets are navel guns with 16in diameter bullets...

Answer 2

It's spelled "caliber," and they are measured primarily by diameter. American and classic British bullets are normally measured in thousandths of an inch, and European bullets by millimeters, but there is some overlap and rounding off. It becomes more confusing when comparing the bullets to the names of the rounds, which do not necessarily conform.
As an example, the standard NATO round is the 5.56x45, and its civilian counterpart is the 223 Remington. You'll see lots of posts that it shoots a .223" bullet, but it doesn't. The bullet is actually .224", or 5.70 mm. The same size bullet is used in the 218 Bee, 219 Wasp, 22 Hornet, 220 Swift, 221 Remington, 222 Remington, 224 Weatherby Magnum, and 225 Winchester, but not the 22 Savage (.228").
In the 30 calibers, the 308 Winchester uses an honest .308" bullet. It's known as the 7.62x51 (bore size, not groove size--groove size and bullet diameter are 7.83 mm, and the Lazzeroni 30 caliber cartridges are called 7.83). In the European system, there are lots of cartridges that have a rimmed and a rimless version, as the 7x57 Mauser and the 7x57R, that are almost identical except that one is rimless and the other rimmed. There is a rimmed version of the 308 Winchester, named the 307 Winchester, but it is NOT called the 7.62x51R, because that name was already taken by the venerable 30 WCF, also known as the 30-30. Confused yet? Basically if you want to know the specifics on a round, you simply have to look it up in reference books. Reloading manuals are a valuable resource to learn these details, even if you don't handload. And anybody interested in these matters really should have Barnes's Cartridges of the World in his library.

Answer 3

Well depending on where you are in the world and how precise you want to be bullets can be measured in 100ths or 1000ths of an inch or in millimeters.
since rifles and pistols have rifling grooves cut into the barrel bullets have to be slightly larger than the nominal caliber of a firearm. A 30 caliber rifle uses bullets .308" in diameter. There can be a bit of confusion starting out since manufacturers often label their cartridges to sound cool. The 30-30, 308 Winchester and the 300 Holland & Holland magnum are all 30 caliber and use bullets .308" in diameter.
In Europe and the rest of the world they use the metric system and express the caliber in millimeters. The 8mm Mauser cartridge uses a bullet 8.2 mm in diameter.
There is also some inprecision thrown in again for marketing.
22 caliber weapons use bullets .224" in diameter but to give cartridges a separate identity there are some caartidges called by a close but slightly different name to their true caliber. There are 219, 220, 221,222, 223,224 and 225 cartridges that all uses .224" bullets. The 38 special pistol round is actually 35 caliber and uses bullets .357" in diameter, I guess way back when they thought a 38 would sell better than a 35. When Smith and Wesson decided to come up with a more powerful, longer version of the 38 special they decided to be precise adn call it the 357 magnum, which is why you can shoot 38 special rounds in a 357 magnum.

Answer 4

See my other answer. Europeans measure bullet diameter & sometimes cartridge length in millimeters. Stateside we say: "I want a box of .30-30 Winchester bullets, please."

Overseas one would ask for a box of 7.62x51(R) with the "R" being for rimmed so as to not confuse it with the .308 Winchester, also known as the 7.62x51NATO.

Clear as mud now? Seriously, the first set of numbers defines the diameter of the bullet, while the second express the case length of the cartridge. Stateside the second number could mean the year the cartridge was developed (like '06 for 1906), or the define parent cartridge (in the case of the .25-06 the '06 means that the new .25 caliber cartridge was based on the old .30-06 case). It takes a while to pick it up, but it is fun after a while. The millimeter designations really are simpler to follow.

Best.

H

Answer 5

The simple version- .22 calibre(see the decimal?) .224 is a .22 long rifle. A 30 calibre is .308. To get the millimeter equivalent, a 7mm X .04 is a 280(its actually a 284) and a 9mm is a 36 caliber(.355). X .04 is an approximate but it doesn't take in the industry standard.
Caliber is thousandths, millimeters are X .04

Answer 6

Bullets are measured by the diameter, either in decimal or metric measurement. In that way the weight of the bullet designates how long it is. As long as the bullet is the same diameter, whether measured in decimal or metric, it can be fired in a barrel that has the matching measurements. The type of ammunition that can be used in a firearm is stamped on the gun, barrel or frame, and designates the size and shape of the round of ammunition. Caliber is the diameter of the bullet. Ammunition is the case and bullet combination, along with powder and primer. No universal naming convention has been used for naming ammunition. A round of ammunition may be named by the bullet caliber, case size, name of designer, year conceived, or any combination of them. If you are interested in learning more, pick up a reloading manual. I have three and each contains information not found in the others. They are written by bullet manufacturers, gunpowder manufacturers, and by individuals for types of firearms.

Answer 7

All bullets are measured in the same way what can throw you off is the grains of weight such as a 45-70 the 45 tells you the millimeter and the 70 is the powder now a 45-70 can have more lead but the cartridge will only hold the 45 dia. lead

Answer 8

There are various ways to measure bullets. I suppose you mean just the diameter. A micrometer is needed. Some are in millimeters, some in hundredths of inches and some in thousandths of inches. The name may be the diameter of lands or grooves, e.g. a .300 Winchester Magnum and a .308 Winchester both use .308" diameter bullets (and the .308 Winchester is a sporting version of the 7.62mm NATO cartridge.)

Answer 9

Caliber; I caliber is equal to 10/1000 of an inch. It is supposed to be the measurement of the diameter of the bullet. For example a 22 caliber is 220/1000 of an inch .45 caliber is 450/1000 of an inch. A 9 millimeter is 9 mm in diameter or .380 of an inch. The actual diameter of a bullet can vary according to the barrel it is to be fired from.

Answer 10

The bullet diameter is measured at the widest part of the base diameter
And is written as a decimal of an inch or in metric as millimeter, it depends as to where you are in the world as to which is used.
The 30 caliber as used in the 30-06 or 308 is in inch .308 diameter where as in metric it is referred to as a 7.62mm.
But this system does not work out as well as it sounds.
The decimal of an inch works out better because .308 will always be .308.
*** US 30 Caliber***
30 Carbine = .308.
30-30 Winchester = .308.
30-40 Krag = .308.
30-06 Springfield = .308.
300 Winchester Magnum = .308.

Where as the metric or millimeter seems to fluctuate from country to country and some times even in the same country.
***Russia***
7.62mm Russian Nagant revolver round in inch is .308.
7.62mm Russian Tokarev pistol round in inch is .307.
7.62 x 39 Russian assault rifle round in inches is .310.
7.62 x 54R Popular Russian sniper rifle round in inch is .308.

***Czechoslovakia***
7.62 x 45 Czech in inches is .309.

*** watch the metric designation change and the inch goes crazy***
7.5 Swiss in inch is .317.
7.5 x 53.5 French MAS in inch is .308.
7.5mm Swedish Nagant Revolver in inch is .325.
7.63 Mauser in inch is .308.
7.65mm French Long MAS in inch .309.
7.65 x 54 Mauser in inch is .313.

All listed info comes from
The Handloader’s Manual of Cartridge Conversions ( Third Edition )

This was not meant to confuse you just show there are some serious deviations in play.
I do hope this was of some help.
D58