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Posted: 6/2/2003 8:36:25 PM EDT
7.62x39

7.62 is the diamater of the bullet in mm. What bout 39? Length of the case? Length of the cartridge?

30-06
.30 is the diameter of the bullet in inches. What does the -06 refer to?

22-250
.22 is the diameter of the bullet. What does the -250 refer to?

-Nick Viejo.
Link Posted: 6/2/2003 8:44:36 PM EDT
39mm is the case length.

.30 is the calibre, -06 stands for 1906 when it was introduced. BTW .30-06 in metric is 7.62x63mm.

.22 is the calibre of the bullet, .250 is the diameter of the case I think.
Link Posted: 6/3/2003 10:29:10 AM EDT
[Last Edit: 6/3/2003 10:30:18 AM EDT by Green_Canoe]

Originally Posted By ZRH:
.22 is the calibre of the bullet, .250 is the diameter of the case I think.



Did great until this one. The 250 in .22-250 is a holdover that designates the parent case. The .22-250 was a wildcat cartridge intially. The parent case is the .250-3000 Savage which was the first comercially marketed cartridge to break the 3000 fps barrier, hence the 3000 in the name.

Kent
Link Posted: 6/3/2003 11:50:00 AM EDT
Well, I was just trying to figure out the conventions behind the caliber designations. I thought the numbers in say, .30-06 or .22-250 actually had some significance to the physics of the round.

Now I'm seeing that it's often just an issue of historical or evolutionary information.

Thanks.

-Nick Viejo.
Link Posted: 6/3/2003 12:57:48 PM EDT
Lots of times they are referring to a parent case;
.22-250, 338-06, etc.

Sometimes they are technical;
7.62x51, 5.45x39.

Sometimes they are meant to be scary!
.50 Beowulf, .338 Remington ULTRA mag.
(I thought only detergent and golf-balls were "ULTRA".)

Sometimes they are even truthful;
.308 Winchester, 7mm Remington

But other times they are not;
.218 Bee, 280 Remington

It sure is fun reading about them though. Lots of cool books available, reloading manuals have this info as well.
Link Posted: 6/3/2003 2:12:31 PM EDT
Link Posted: 6/5/2003 8:02:00 PM EDT
Bah. your 'standard' numbers confuse me
diameter X case-length are all I(and most people) really need to know/do care about, not the year introduced or its original design velocity(sometimes usefull, but varies too much for it to be in a name).
Link Posted: 6/5/2003 8:07:55 PM EDT
Ahh shaddup. ;)

Hell now I feel bad about getting that .22-250 one wrong. Plz dont beat me...
Link Posted: 6/7/2003 10:09:51 AM EDT
..they mean different things.....30-06..30 cal 1906....which is a very different round than the 30us which preceded it....45-70....44-40...these are relative to thier predecesor "black powder" rounds..where the following number refers to powder charge...but doesn`t really hold true in the modern cartrige...best thing is to read up and study the history...to get a feel for the various cartridges...a ballistic chart...and reloading manual are good sources of info..
Link Posted: 6/7/2003 5:09:45 PM EDT
I spend so much money on guns I cant afford much else anyomre lol.
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