.308 - 7.62 - 7.92 or is that 7.82 You tell me.

[janfred]

Outer diameter of 303, 7.62x39 and 7.62x53R is the same: .311"

Outer diameter of 308, 30-06 and the 300's is the same: .308"

Outer diameter of the 7.92 Mauser until 1905 was .318"

Outer diameter of the 7.92mm Mauser after 1905 is .323"

The naming is rather convoluted for the 7.92 mauser. From Wikipedia
"The 7.92×57mm Mauser cartridge is also known by the following designations:

7.9, 7.9mm[12]
7.9 Mauser, 7.9mm Mauser
7.92, 7.92mm
7.92 Mauser, 7.92mm Mauser
Cartridge SA, 7.92
7.92×57, 7.92×57mm
7.92×57 Mauser, 7.92×57mm Mauser
8mm Mauser
8×57, 8×57mm
8×57 Mauser, 8×57mm Mauser
8 × 57 IS, 8 × 57 JS

This list is not conclusive and other nomenclature or designation variations might be encountered."

So much that CIP has standardised it to "8x57 IS". SAAMI is not so exacting...

[KK20]

I thought I knew then I realized I had just forgotten. I also found out I was lost because there are "groove" measurements and the "lands" measurements, but they are all 30 Cal bullets including the 0.311 - 0.312- 0.313 and 0.314 but thats not a AK 47 or a 30 06 or a 308 nor an Mosin-Nagant, but a .303
Go figure ey ?

treeman:
https://www.gunsite.co.za/forums/sho...at-we-got-here

and specifically

Wanderin' Zero
Default Re: Mosin-Nagant what we got here
The nominal diameter of a 7.62x54R bullet is 7.92mm. Your barrel should then have lands of 7.899mm and grooves of 7.97mm.

[AK-Gunner]

Way too many errors to correct them here: go check Wikipedia articles, I've corrected at least most of the errors there already to be in accord with official C.I.P. measurements...

[AK-Gunner]

From Cartridges of the world.

Toss it to the bin if your copy paste is true to the book.

[AK-Gunner]

Way too many errors to correct them here: go check Wikipedia articles, I've corrected at least most of the errors there already to be in accord with official C.I.P. measurements...

Except for the 7,92X57 family: there are books written on the topic and the Wikipedia article falsely collects them all into one bunch. Nope, there are both moot and severe differences with different versions which may cause problems if used in a wrong kind of rifle.

[treeman]

Way too many errors to correct them here: go check Wikipedia articles, I've corrected at least most of the errors there already to be in accord with official C.I.P. measurements...

************************
Hence my statement - heading - post # 1

308 - 7.62 - 7.92 or is that 7.82 You tell me.

I thought I knew then I realized I had just forgotten. I also found out I was lost because there are "groove" measurements and the "lands" measurements, but they are all 30 Cal bullets including the 0.311 - 0.312- 0.313 and 0.314 but thats not a AK 47 or a 30 06 or a 308 nor an Mosin-Nagant, but a .303
Go figure ey ?

[treeman]

As KK reminded me of a post of mine 9 years ago.
Re: Mosin-Nagant what we got here

since posting - I researched a second nite.It would appear that the Finns started Manufacturing these rifles - but never the bolts,Sako and Tikka after the war,the pre 39 models were 7.62 and post 39 mods were iether 7.8 or 7.9mm.They were refered to as the Finnish Mosin Nagants.All appear to fall under the M39 model. Still scratching-- oh yea there was also a 7.62 x 53mm Finnish as apposed to the Russion 7.62 x 54 and 54r

***********************
Hence the I thought "I thought I knew then I realized I had just forgotten. I also found out I was lost" part.

I have tried before to get my little mind completely around this little sordid part of firearm interbreeding and incestuous proliferation of bastardized calibers.

[Sean KZN]

Throw in the Swiss 7.65 just for giggles. It can shoot 7.62/308 bullets fine though.

[AK-Gunner]

Most of the caliber names should be regarded as 'friendly names', like the caliber of M1891 Mosin-Nagant could be 'Ivan' or 'Vladimir'. Why? Because so many of them are not actual 'calibers' at all. Like .22LR vs .223 Remington. So the .223 bullet is thicker? No, because .22LR is just a name, not the actual caliber which is in fact .223 to .2255 (with lead bullets some deviation is just fine). Well, is 5.56X45 then 5.56 caliber really? No, its actually 5,7 mm which is .224 inches which is smaller diameter than .22LR which is a smaller number.

...and how about .308 Winchester and its cousin .307 Winchester? The only difference is that .307 is a rimmed cartridge, the bullet and bore are the same.

So: calibers are usually just names.

[BBCT]

Don't forget the 7.7x56R, a pretty much exclusively South African version (thanks to the metrication board of the 1970's) of the cartridge better known as the .303 Brit. To the best of my knowledge in all the 100-and-something years of the existence of the .303 cartridge. South Africa is the only country ever to have manufactured a metric. 303 cartridge.................