The .270 Win is true 7mm - not the 7mm-08 or the 7mm Rem Mag.

358 BLR said:
:stirthepot2: Somebody is stirring the pot! :stirthepot2:
:popCorn::D
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I've heard so much tripe about the .270 being "not quite true 7 mm" over the years that I took it for granted. The 6.8 Remington (which is 7.0 mm too!) reinforced that misconception.

Imagine my shock to find out that the .270 Win IS 7.0 mm. Didn't anybody bother to do some freaking math? I sure didn't. :redface:

Chuck Hawks said:
Strangely, the cartridge that has most profoundly influenced the 7mm class from the 1930's to the present day has been a cartridge that is not a true 7mm at all, the .270 Winchester. The .270 uses a .277" diameter bullet, but it is so close to the true 7mm's .284" bullet that they are inevitably compared.

http://www.chuckhawks.com/7mm_musings.htm
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Chuck didn't bother to check either. :D
 
Gatehouse said:
I'm surprised that this is news to anyone! Doesn't anyone own calipers and calculators anymore?
:)
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exactly...this is no revelation...:rolleyes:

1.0 mm is .03937"

.03937 x 7 = .275595..or .276

and by the same exercise the 257 is the true 6.5mm.

.03937 x 6.5 = .255905.....or .256

reason is....the Europeans quoted bore diameter in thier barrels....North Americans quoted groove diameter....simple really.:)
 
philthygeezer said:
I've heard so much tripe about the .270 being "not quite true 7 mm" over the years that I took it for granted. The 6.8 Remington (which is 7.0 mm too!) reinforced that misconception.

Imagine my shock to find out that the .270 Win IS 7.0 mm. Didn't anybody bother to do some freaking math? I sure didn't. :redface:



Chuck didn't bother to check either. :D
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You are right and I am in no way disagreeing with you. The naming scheme used by ammo manufacturers has always been a bit of a mystery to me: take
the .38 Special as another example (maybe it means you're a "Special kind of stupid" if you actually believe it's 0.38" in diameter):D. It's probably everything
to do marketing and very little to do with facts.
 
Metric calibre designations traditionally use land diameter of the barrel. This is why a 7mm bullet is more than 7mm in diameter. Some Imperial designations do the same thing, such as for .270, .30, or .303 calibres.
 
Irregardless of the actual math, the next time I'm having a beer with my good friend, I'll claim the .270 is the real 7mm. This will drive him crazy (snicker). He loves the 6.5X55 and most 7mm's, but hates the .270 Win.
This is going to be fun!
 
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