PDA

View Full Version : 7.62 cal = 30cal??


Raptor3000
12-15-2011, 8:03 PM
Hi Guys,

Got a 30 cal bore brush for my AK47 (7.62X39), is it OK?

Just want to confirm before cleaning my AK47 with it.

Thanks in advance.

Bhobbs
12-15-2011, 8:04 PM
Basically, yes.

nicoroshi
12-15-2011, 8:09 PM
I use a 30cal bore snake in my 7.62x39 AKs.
Works perfect.

CSACANNONEER
12-15-2011, 8:10 PM
Yea, it would be the right brush if there was any reason to clean an AK.

Raptor3000
12-15-2011, 8:14 PM
Thanks Guys

five.five-six
12-15-2011, 8:19 PM
7.62mm ~= .308 inches

cfusionpm
12-15-2011, 8:23 PM
Every cleaning device I use on my Remington 700 and Springfield M1A (.308/7.62) are all listed as ".30 cal." As long as it fits and gets the job done, that's what matters.

rojocorsa
12-15-2011, 8:56 PM
7.62mm ~= .308 inches
=
Well yes, but in OP's case, it's +/- .311" European guns are a bit wider than our .308" bores in that regard.


Not debating or anything, but maybe the OP would like to learn this info.

tonelar
12-15-2011, 9:00 PM
7.62 cal = 1.7 mm

awall919
12-15-2011, 9:01 PM
Yea, it would be the right brush if there was any reason to clean an AK.

Too true. But yes for cleaning applications 7.62mm and .30cal are the same. Id go boresnake especally for an ak, quick and easy barrel clean.

gun toting monkeyboy
12-15-2011, 9:04 PM
7.62 cal = 1.7 mm

Ummm... you may need to check your math on that one...
:rolleyes:

goodlookin1
12-15-2011, 9:08 PM
7.62 cal = 1.7 mm

http://www.rcmill.com/ryan/derp.jpeg

SamSung
12-15-2011, 9:31 PM
7.62 cal = 1.7 mm
:facepalm:

guimus
12-15-2011, 9:41 PM
Yeah....I think it's actually 1.9mm.

Unless you're talking European convention, then it's .19mm.

858casper858
12-15-2011, 10:06 PM
7.62 cal = 1.7 mm

Yeah....I think it's actually 1.9mm.

Unless you're talking European convention, then it's .19mm.

Ummmm.... What?!?

jokat989
12-15-2011, 10:34 PM
Yeah....I think it's actually 1.9mm.

Unless you're talking European convention, then it's .19mm.

if your reffering to the European system where they randomly drop a zero for no mathematical reason whatsoever, then yes.

otherwise .0762 inches = 1.93548 millimeters according to the Google system

zfields
12-15-2011, 10:36 PM
if your reffering to the European system where they randomly drop a zero for no mathematical reason whatsoever, then yes.

otherwise .0762 inches = 1.93548 millimeters according to the Google system

I dont know if this is serious or not....

Turo
12-15-2011, 10:39 PM
if your reffering to the European system where they randomly drop a zero for no mathematical reason whatsoever, then yes.

otherwise .0762 inches = 1.93548 millimeters according to the Google system
Except that caliber is synonyms with inches. A 7.62 caliber rifle would have a bore of
7.62 inches. Just like a .40 caliber bore is exactly 4 tenths of an inch.

eaglemike
12-15-2011, 10:48 PM
7.62mm ~= .308 inches
you are the closest!
goodness!

7.65/25.4 = .3

(25.4mm per inch)

zfields
12-15-2011, 10:54 PM
Except that caliber is synonyms with inches. A 7.62 caliber rifle would have a bore of
7.62 inches. Just like a .40 caliber bore is exactly 4 tenths of an inch.

Sadly though, that is only partially accurate. compare a 9mm Mak, 9mm Luger. Or a 762x51 and a 762x54r

It gives a rough idea, but you still need to look into the actual bore size by swaging it

Turo
12-15-2011, 11:19 PM
Sadly though, that is only partially accurate. compare a 9mm Mak, 9mm Luger. Or a 762x51 and a 762x54r

It gives a rough idea, but you still need to look into the actual bore size by swaging it

That has nothing to do with what I said. I know different cartridges can have different bullet diameters with the same designation. I'm saying that caliber refers to the diameter of a bullet in inches, not in hundredths of an inch. The names of cartridges often don't refer to the actual diameters of the bullets used, but if a bullet had a diameter of 7.62, and it was expressed as a 7.62 caliber, it would be referring to a barrel inside diameter of 7 inches and 62 hundredths of an inch.

hcbr
12-15-2011, 11:26 PM
lol derp derp haha

rojocorsa
12-15-2011, 11:26 PM
As a rule of thumb

(millimeters) divided by (25.4) = (inch caliber)

(inch cal) x (25.4) = (millimeters)


This won't always be precise, but you will get a general ballpark figure.

SwPx4
12-15-2011, 11:36 PM
That has nothing to do with what I said. I know different cartridges can have different bullet diameters with the same designation. I'm saying that caliber refers to the diameter of a bullet in inches, not in hundredths of an inch. The names of cartridges often don't refer to the actual diameters of the bullets used, but if a bullet had a diameter of 7.62, and it was expressed as a 7.62 caliber, it would be referring to a barrel inside diameter of 7 inches and 62 hundredths of an inch.

Are you serious? Isn't the 7.62 part in millimeters? Thus, .30 inches, ? Does any one actually say, this is a (point) 40 caliber weapon? Wouldn't they just say "40"? Or the .50 bmg? I have never heard it referred to as the "POINT FIFTY CALIBER"

five.five-six
12-15-2011, 11:45 PM
first off, it is pronounced "fo-Tay" 2ndly, am I the only one in this thread that loads rifle cartages?

:facepalm:

zfields
12-15-2011, 11:53 PM
That has nothing to do with what I said. I know different cartridges can have different bullet diameters with the same designation. I'm saying that caliber refers to the diameter of a bullet in inches, not in hundredths of an inch. The names of cartridges often don't refer to the actual diameters of the bullets used, but if a bullet had a diameter of 7.62, and it was expressed as a 7.62 caliber, it would be referring to a barrel inside diameter of 7 inches and 62 hundredths of an inch.

Ok, now I think you are kidding.


7.62 is 7.62mm, or "close" to .308 caliber as it is normally called in traditional imperial sizing. Or broaden it out to a .30 caliber projectile to cover a larger range, but still talking a similar bullet.

another good example would be a 9mm, and a .38. Both are actually referring to a .356-.358 bullet, and similar sized bore.

and yes, the names of cartridges often DO refer to a nominal sizing, not an exact.

Turo
12-15-2011, 11:58 PM
Ok, now I think you are kidding.


7.62 is 7.62mm, or "close" to .308 caliber as it is normally called in traditional imperial sizing. Or broaden it out to a .30 caliber projectile to cover a larger range, but still talking a similar bullet.

another good example would be a 9mm, and a .38. Both are actually referring to a .356-.358 bullet, and similar sized bore.

and yes, the names of cartridges often DO refer to a nominal sizing, not an exact.

A swing and a miss. Strike two.

zfields
12-16-2011, 12:02 AM
A swing and a miss. Strike two.

Please, then explain how a 7.62mm caliber bullet relates to 7.62".

strongpoint
12-16-2011, 12:06 AM
Ok, now I think you are kidding.


7.62 is 7.62mm, or "close" to .308 caliber as it is normally called in traditional imperial sizing. Or broaden it out to a .30 caliber projectile to cover a larger range, but still talking a similar bullet.

another good example would be a 9mm, and a .38. Both are actually referring to a .356-.358 bullet, and similar sized bore.

and yes, the names of cartridges often DO refer to a nominal sizing, not an exact.


the thread title refers to 7.62 caliber, which is the incorrect nomenclature. because of this, the entire thread is now completely off the rails.

zfields
12-16-2011, 12:13 AM
the thread title refers to 7.62 caliber, which is the incorrect nomenclature. because of this, the entire thread is now completely off the rails.

Jeez, with all the shorthand used on calguns, talk about splitting hairs.

Because you know, 7.62" calibers are so common that it could be mistook with a .30 cal.

Kinsel83
12-16-2011, 5:01 AM
What is all the mathematical wrangling about? The op asked a simple question lol. The question was answered. Who cares about the schematics.

GM4spd
12-16-2011, 5:36 AM
Yea, it would be the right brush if there was any reason to clean an AK.

Good point!

bigthaiboy
12-16-2011, 6:07 AM
What is all the mathematical wrangling about? The op asked a simple question lol. The question was answered. Who cares about the schematics.

If you're happy with just getting a Yes or No answer, then you've got your answer. If you actually want correct information which helps you understand why 7.62 converts to .30cal, then this thread has several examples of FAIL.

For those who probably own rifles in these calibers but don't understand what the metric measurements mean:

AK calibers are 7.62mm x 39mm
and 5.45mm x 39mm
Mosin / PSL is 7.62mm x 54mm Rimmed
5.56 NATO is 5.56mm x 45mm
7.62 NATO is 7.62mm x 51mm.

.50" = 12.7mm
1 inch = 25.4mm
1 inch = 0.0254 meter.

five.five-six
12-16-2011, 8:37 AM
this thread is like a fail factory running at 110% production

Bhobbs
12-16-2011, 8:45 AM
Except that caliber is synonyms with inches. A 7.62 caliber rifle would have a bore of
7.62 inches. Just like a .40 caliber bore is exactly 4 tenths of an inch.

Caliber also refers to the length to projectile diameter ratio of large guns. The Mk7 16" gun is 50 calibers long so it is 16"*50=800" or 66'8".

nicoroshi
12-16-2011, 9:40 AM
this thread is like a fail factory running at 110% production

Agreed.
Was good for a few laughs though.
And btw you're not the only one who reloads in this thread. :)

zfields
12-16-2011, 10:24 AM
Agreed.
Was good for a few laughs though.
And btw you're not the only one who reloads in this thread. :)

No hes not.

*gets back to pressin'*

NytWolf
12-16-2011, 10:37 AM
7.62 cal = 1.7 mm

Yeah....I think it's actually 1.9mm.

Unless you're talking European convention, then it's .19mm.

if your reffering to the European system where they randomly drop a zero for no mathematical reason whatsoever, then yes.

otherwise .0762 inches = 1.93548 millimeters according to the Google system

LOL ... don't know who's serious and who's not. BUT ... 7.62x39 is (mm)x(mm). It's 7.62mmx39mm. 7.62 by itself is not a caliber.

Precisely though, 7.62mm in inches is 0.30 inches. The 30-caliber is 0.308 inches.

Fiveohmike
12-16-2011, 10:51 AM
7.62 "caliber" is 7.62" bullet diameter,

just as

.50 caliber is .500" bullet diamter = 12.7mm


7.62mmx39mm = ~.300 bullet diamter = .30 caliber bullet

Am I the only one that gets that he used the wrong term and had everyone captaining the failboat?

wtkaiser
12-16-2011, 6:58 PM
I can't believe a) that this thread has gone on as far as it has, and b) that I read the entire damned thing! What a colossal waste. Congratulations!

OniKoroshi
12-16-2011, 7:44 PM
7.62" is like an tank round. I never knew that my 7.62x54r round once shot, expands to 7.62 inches... Amazing... I wonder if Einstein is rolling in his grave...

cmace22
12-16-2011, 8:11 PM
Haha. Splitting hairs are we..... So to recap 7.62 cal IS 7.62 inches. So 7.62 cal is NOT equal to .30 cal, 7.62" vs .30". 7.62mm is equal to a .30 cal.

"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. It is important to performance that a bullet should closely match the groove diameter of a barrel to ensure a good seal. When the barrel diameter is given in inches, the abbreviation "cal" is used in place of "inches." For example, a small bore rifle with a diameter of 0.22 inch is a .22 cal; however, the decimal point is generally dropped when spoken, making it "twenty-two caliber" or a "two-two caliber". Calibers of firearms can be referred to in millimeters, as in a "caliber of eighty-eight millimeters" (88 mm) or "a hundred and five-millimeter caliber gun" (often abbreviated as "105 mm gun")."

russ69
12-16-2011, 8:58 PM
...Who cares about the schematics.

I think you mean....Who cares about semantics, but thanks for keeping the fail in this thread.

cmace22
12-16-2011, 9:03 PM
I think you mean....Who cares about semantics, but thanks for keeping the fail in this thread.

Hahahahaha!

runway1
12-16-2011, 9:06 PM
7.62 cal = 1.7 mm

:facepalm:

Yeah....I think it's actually 1.9mm.

Unless you're talking European convention, then it's .19mm.

Ummmm.... What?!?

if your reffering to the European system where they randomly drop a zero for no mathematical reason whatsoever, then yes.

otherwise .0762 inches = 1.93548 millimeters according to the Google system

you are the closest!
goodness!

7.65/25.4 = .3

(25.4mm per inch)

Dear GOD! Are we Americans reeeeeally THAT mathematically challenged? Sorry, as an American engineer, I can't help but cringe.

Thanks eaglemike - YES. the factor is 25.4mm = 1.0 inch. 7.62/25.4 = .30. The next sig-fig in the calulation is an 8....but DEAR GOD!

runway1
12-16-2011, 9:12 PM
What is all the mathematical wrangling about? The op asked a simple question lol. The question was answered. Who cares about the schematics.

Schematics? I do! How else am I to restore that Chevelle's wiring without the schematics??:D:rofl2:

this thread is like a fail factory running at 110% production

:smilielol5:

Reverend Clint
12-16-2011, 9:14 PM
this thread went full retard

DasBoost
12-16-2011, 9:18 PM
this thread is like a fail factory running at 110% production

Quit hating on American production! :oji: Would you prefer it outsourced? Lol.

Also, I'm not saying anything as I'm s** at math. I know thew basics and that's it. I will further confound the thread though with 7.5mm Swiss uses .308" bullets. Minds blown yet?? :rolleyes:

Johnnykck
12-16-2011, 9:20 PM
OMG!!!!!!!:wacko:

Fjold
12-16-2011, 9:44 PM
I think you mean....Who cares about semantics, but thanks for keeping the fail in this thread.

I'm glad that someone else caught that, I thought that I was going to have to repost that "Derp" picture.

five.five-six
12-17-2011, 10:30 PM
that would be something, the thread that got Fjold to post a derp pic :rofl2:

Solus
12-17-2011, 10:43 PM
no kidding all I can think in my head is....I dont need to type it those who know that 7.62x39 is metric and .308 is standard(american) know what Im thinking and that they both use a ~.30" caliber brush because they are so close that it doesnt matter cause the brush is bigger than the barrel hole in the first place so that it can clean it correctly and get as much surface space as possible. With that being said I hope you all were just joking and not a bunch of noobs

jokat989
12-17-2011, 10:50 PM
i cant believe this thread is 2 pages long about a simple question.
FAIL

xtalpimp
12-18-2011, 12:50 PM
Agreed.
Was good for a few laughs though.
And btw you're not the only one who reloads in this thread. :)

You are being modest. I got more than a few laughs :rolleyes:

Richard Erichsen
12-18-2011, 1:03 PM
Hi Guys,

Got a 30 cal bore brush for my AK47 (7.62X39), is it OK?

Just want to confirm before cleaning my AK47 with it.

Thanks in advance.

The bristles of most brushes will fill the difference (.308 vs. .311) just fine. Enfield (.303) and Arisaka (7.7 mm) users have the same "problem." YMMV when the bristles wear and don't stand straight out from the rod anymore.

A bore guide is always a good idea with a rod, boresnakes don't have this problem and have generous material for swabbing the bore.

Good luck,

R

luchador768
12-18-2011, 1:39 PM
Jeebus!!! Even the bald retard in Full Metal Jacket knew it was 7.62 mm!!!!

J.S.Riesch
12-18-2011, 2:00 PM
OMG!!!!!!!:wacko:

Hope this will rectify this issue….

http://en.wikipedia.org/wiki/Caliber