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Posted: 2/1/2012 6:43:04 PM EST
5.56 does not equal .223 in?

Just drunk and curious. 7.62 equals .3in.
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Posted: 2/1/2012 6:50:17 PM EST
Bore Diameter and Groove Diameter.

Two different things.
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Posted: 2/1/2012 6:53:21 PM EST
Originally Posted By RedFalconBill:
Bore Diameter and Groove Diameter.

Two different things.


Ahhhh. I see

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Posted: 2/1/2012 6:54:13 PM EST
All your questions will be answered
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Posted: 2/1/2012 7:06:33 PM EST
Originally Posted By BillyDoubleU:
All your questions will be answered


I know all of that but I was just crunching numbers and .223 equals 5.6642
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Posted: 2/1/2012 7:10:06 PM EST

Originally Posted By IROC355:
Originally Posted By RedFalconBill:
Bore Diameter and Groove Diameter.

Two different things.

Ahhhh. I see



Dude, 5.56mm and 7.62mm is the Bore Diameter.

0.224" and 0.308" is the Groove Diameter.

Just how drunk are you?

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Posted: 2/1/2012 7:18:47 PM EST
Enuff 2 post dunk and stup0id
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Posted: 2/1/2012 7:23:14 PM EST
actually i am not drunk but i don't know either, someone care to elaborate a bit more? thanks
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Posted: 2/1/2012 7:27:14 PM EST

Originally Posted By ns66:
actually i am not drunk but i don't know either, someone care to elaborate a bit more? thanks

The groove diameter is the diameter of the bullet.

The bore diameter subtracts the rifling depth.

Example:

7.62mm = 0.300"
Bullet Diameter = 0.308"
The difference means that the rifling depth is ~0.004"

5.56mm = 0.219"
Bullet Diameter = 0.224"
The difference means that the rifling depth is ~0.0025"


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Posted: 2/1/2012 7:30:00 PM EST
[Last Edit: 2/1/2012 7:49:39 PM EST by 458winmag]
5.56mm = .223", 7.62mm = .308" It's a math thing

The reverse is not true
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Posted: 2/1/2012 8:05:21 PM EST
Originally Posted By RedFalconBill:

Originally Posted By ns66:
actually i am not drunk but i don't know either, someone care to elaborate a bit more? thanks

The groove diameter is the diameter of the bullet.

The bore diameter subtracts the rifling depth.

Example:

7.62mm = 0.300"
Bullet Diameter = 0.308"
The difference means that the rifling depth is ~0.004"

5.56mm = 0.219"
Bullet Diameter = 0.224"
The difference means that the rifling depth is ~0.0025"



thanks now it's quite clear
but how about .223? it was designed to shoot in .223 bore? but also can be fired in 5.56 is that right?
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Posted: 2/1/2012 8:09:54 PM EST
[Last Edit: 2/1/2012 8:18:45 PM EST by RedFalconBill]

Originally Posted By ns66:

thanks now it's quite clear
but how about .223? it was designed to shoot in .223 bore? but also can be fired in 5.56 is that right?

The original name of the .223 Remington was the .222 Remington Special, which they though would create confusion with the .222 Remington, which was introduced in 1950.

In 1959 they changed it to .223 Remington.
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Posted: 2/1/2012 8:22:35 PM EST
when a cartridge is designed, obviously bullet diameter is specified, does the bore diameter is also fixed (part of the spec)? or it can be shot in various bore diameter?
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Posted: 2/1/2012 8:25:46 PM EST
[Last Edit: 2/1/2012 8:31:33 PM EST by B44T]
Before WWII .22 center fire groove diameters varied from one maker to another. Rifles, barrels, ammunition and bullets could be had in different diameters of .22 cal. There was no industry standard as so to speak and wild catting was all the rage for decades to come.

By the end of the 1950's .224 became the dominant bullet/groove diameter but there were still makers out there producing .223 groove well into the 1960's. No idea about European makers.

Hornady makes bullets for the hand loader in .222, .223, .224 and .227 diameter. Sierra make them in .223 and .224
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Posted: 2/1/2012 8:29:05 PM EST
[Last Edit: 2/1/2012 8:30:01 PM EST by B44T]
deleted double post,,,,,don't know how I did that.
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Posted: 2/1/2012 8:53:37 PM EST
[Last Edit: 2/1/2012 8:54:13 PM EST by RedFalconBill]

Originally Posted By ns66:
when a cartridge is designed, obviously bullet diameter is specified, does the bore diameter is also fixed (part of the spec)? or it can be shot in various bore diameter?

Essentially, the bore diameter is fixed because the rifling depth is fixed.

.22's have ~0.005" to 0.006"
6mm's and .25's have ~0.006" to 0.007"
6.5mm's have ~0.007"
.27's have ~0.007" to 0.008"
7mm's, 7.62mm's have ~0.008"
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Posted: 2/2/2012 2:28:23 PM EST
Originally Posted By RedFalconBill:

Originally Posted By ns66:
when a cartridge is designed, obviously bullet diameter is specified, does the bore diameter is also fixed (part of the spec)? or it can be shot in various bore diameter?

Essentially, the bore diameter is fixed because the rifling depth is fixed.

.22's have ~0.005" to 0.006"
6mm's and .25's have ~0.006" to 0.007"
6.5mm's have ~0.007"
.27's have ~0.007" to 0.008"
7mm's, 7.62mm's have ~0.008"


so rifling depth is in the spec? i am just curious if one can shoot a round in barrels with slightly different bore diameters
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Posted: 2/2/2012 2:36:36 PM EST

Originally Posted By ns66:

so rifling depth is in the spec? i am just curious if one can shoot a round in barrels with slightly different bore diameters

You can only shoot a round that the firearm is chamber for, or that can headspace in the chamber safely (eg, .38 Special in a .357 Magnum chamber).

Are you asking if you can handload bullets of different diameters in a cartridge (eg, using 0.355" bullets in a 0.357" barrel, or 0.223" bullets in a 0.224" barrel)?
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Posted: 2/2/2012 2:52:07 PM EST
[Last Edit: 2/2/2012 2:52:07 PM EST by Lancelot]
Topic Moved
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Posted: 2/2/2012 4:17:36 PM EST
Originally Posted By RedFalconBill:

Originally Posted By ns66:
actually i am not drunk but i don't know either, someone care to elaborate a bit more? thanks

The groove diameter is the diameter of the bullet.

The bore diameter subtracts the rifling depth.

Example:

7.62mm = 0.300"
Bullet Diameter = 0.308"
The difference means that the rifling depth is ~0.004"

5.56mm = 0.219"
Bullet Diameter = 0.224"
The difference means that the rifling depth is ~0.0025"




Sorry, but 7.62 does not always equal .308" bullet diameter. 7.62X54R measures .311". 7.62X39 also is a .311" bullet. 7.62X25 is a .309" bullet. 7.62X45 is a .304" bullet. 7.62X51/.308, 7.5X55, and 30-'06 are .308" bullets. Bore is .300" as stated but groove diameter is .314" on a Mosin Nagant chambered for 7.62X54R. The rifling depth is therefore -.007". There is a clearance of .0015" between the bullet and the bottom of the rifling. Running a .308 in the Mosin Nagant doubles the clearance over the stock 7.62X54R round with a resulting reduction in pressure.
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Posted: 2/2/2012 4:55:11 PM EST
[Last Edit: 2/2/2012 5:20:36 PM EST by RedFalconBill]

Originally Posted By CamoColt:
Originally Posted By RedFalconBill:

Originally Posted By ns66:
actually i am not drunk but i don't know either, someone care to elaborate a bit more? thanks

The groove diameter is the diameter of the bullet.

The bore diameter subtracts the rifling depth.

Example:

7.62mm = 0.300"
Bullet Diameter = 0.308"
The difference means that the rifling depth is ~0.004"

5.56mm = 0.219"
Bullet Diameter = 0.224"
The difference means that the rifling depth is ~0.0025"




Sorry, but 7.62 does not always equal .308" bullet diameter. 7.62X54R measures .311". 7.62X39 also is a .311" bullet. 7.62X25 is a .309" bullet. 7.62X45 is a .304" bullet. 7.62X51/.308, 7.5X55, and 30-'06 are .308" bullets. Bore is .300" as stated but groove diameter is .314" on a Mosin Nagant chambered for 7.62X54R. The rifling depth is therefore -.007". There is a clearance of .0015" between the bullet and the bottom of the rifling. Running a .308 in the Mosin Nagant doubles the clearance over the stock 7.62X54R round with a resulting reduction in pressure.

And running 0.310" bullets will cause an increase in pressure.

M1891's run from 0.3095 through 0.315".

You are bringing up a peasant rifle and other minutia.

You also forgot the 7.92x57 and 0.318" vs. 0.323" bores.
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Posted: 2/2/2012 5:22:17 PM EST
is rifling measured in depth or the height? rifling is engraved on the bullets i shoot. so the bore is the big part of the tube and the rifling is the little part of the tube. nevermind, i'm drinking with the OP....




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Posted: 2/2/2012 8:11:15 PM EST
[Last Edit: 2/2/2012 8:12:36 PM EST by ns66]
Originally Posted By RedFalconBill:

Originally Posted By ns66:

so rifling depth is in the spec? i am just curious if one can shoot a round in barrels with slightly different bore diameters

You can only shoot a round that the firearm is chamber for, or that can headspace in the chamber safely (eg, .38 Special in a .357 Magnum chamber).

Are you asking if you can handload bullets of different diameters in a cartridge (eg, using 0.355" bullets in a 0.357" barrel, or 0.223" bullets in a 0.224" barrel)?


no i am just curious when a cartridge is designed, whether the rifling depth is strictly specified for it to be shot properly. for example 5.56 and .223 and .22lr all have same bullet diameter, when they were designed, the rifling depths are specified happened to be the same? since they all can be shot in ar-15 bore (.22lr with the kit)

also .223 round, does the ".223" have any real meaning/dimension or just a name
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Posted: 2/3/2012 5:52:08 AM EST

Originally Posted By ns66:
Originally Posted By RedFalconBill:

Originally Posted By ns66:

so rifling depth is in the spec? i am just curious if one can shoot a round in barrels with slightly different bore diameters

You can only shoot a round that the firearm is chamber for, or that can headspace in the chamber safely (eg, .38 Special in a .357 Magnum chamber).

Are you asking if you can handload bullets of different diameters in a cartridge (eg, using 0.355" bullets in a 0.357" barrel, or 0.223" bullets in a 0.224" barrel)?

no i am just curious when a cartridge is designed, whether the rifling depth is strictly specified for it to be shot properly. for example 5.56 and .223 and .22lr all have same bullet diameter, when they were designed, the rifling depths are specified happened to be the same? since they all can be shot in ar-15 bore (.22lr with the kit)

also .223 round, does the ".223" have any real meaning/dimension or just a name

A true .22 Short/Long/Long Rifle is 0.222". They are 19th century rounds. Much of this was trial and error before the turn of the last century. They work well enough.

The name .223 Remington means nothing. Remington named it that in 1959 because the original name was the .222 Remington Special.

The original name of the .222 Remington Magnum was the .224 Springfield.

There is little commonality between the caliber of the barrel, or the name of the round. You just need to memorize them.
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Posted: 2/3/2012 6:41:17 AM EST
thanks RedFalconBill
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