Truth? What is the 270 Win rd based on

I always thought it was based off of the 30-06 rounds. Is the information below correct as stated? Any thoughts on this? Thanks
James

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The .270 Winchester was developed by Winchester Repeating Arms Company in 1923 and unveiled the in 1925 as a chambering for their bolt action Model 54[1]. The cartridge is based upon the .30-03 Springfield case, not the slightly shorter .30-06 Springfield (as is commonly stated)[citation needed].


While it is true that a .270 Winchester case can be formed from a 30-06 Springfield case, the case length of a 30-06 is 2.494 inches while the case length of a .270 is 2.540 inches. The 30-03 case length was 2.564 inches.

You can look at it 2 ways, the 270 is either baised on a stretched 30-06 (7.62x63) case, or a necked down 30-03 (7.62x64) case.

If you realy want to stretch a point, you might as well state that it is baised on the 7x57 Mauser, as that is where the base & rim dimentions are derivied from (ever wonder why so many "Americian" cartridges have a 12mm head size?).

quote:

Originally posted by jeh7mmmag:
From Wikipedia, the free encyclopedia
Jump to: navigation, search
The .270 Winchester was developed by Winchester Repeating Arms Company in 1923 and unveiled the in 1925 as a chambering for their bolt action Model 54[1]. The cartridge is based upon the .30-03 Springfield case, not the slightly shorter .30-06 Springfield (as is commonly stated)[citation needed].

To me, that's just quibbling and nitpicking.

Like Tailgunner says, a lot of rounds really derived from the German 7x57/8x57 cartridges and their base and rim dimensions. The differences in case length, neck length, should location and shoulder angle, and caliber are really just minor details in the case design.

By the way, I've read an article (in Rifle or Handloader magazine) by John Barsness where he states he found information in some cartridge reference books that show the .270 Winchester was first chambered in a Winchester rifle around 1917 or so. There was also a photo of the rifle. It seems that World War I got in the way of Winchester's plans. (They had to tool up for war production.) I can't remember better details right now. I'll try to find the article.

My two cents...
-Bob F.

Note that sizing a .30-06 case neck down to a smaller caliber will make the neck longer. So the case length will be longer. The more it's sized down, the longer the case neck and total length will be.

I've heard this question before, but don't know the history behind the .270.

I do know the 7.62mm NATO cartridge was based on the .300 Savage case by Remington folks who designed it. After Winchester got a contract to make some ammo, they decided to commercialize it as the .308 Win.

Actually the 7x57 is based off the 7.92x57I or J (8x57J)as it is called here in the states. Dating from 1888, the 7x57 from 1893 or so. So the 8x57 is the daddy of all those standard bolt face rounds. It's also a fine chambering in it's own right.

quote:

Originally posted by Planemech:
Actually the 7x57 is based off the 7.92x57I or J (8x57J)as it is called here in the states. Dating from 1888, the 7x57 from 1893 or so. So the 8x57 is the daddy of all those standard bolt face rounds. It's also a fine chambering in it's own right.

Of course, this is true.

As for the 270 Win., it is difficult to say whether it was originally made from a .30/'03 case or a .30/'06 case, but in view of the fact that the .30/'06 had superceded the .30/'03 long before the advent of the .270 (whether it originated in 1917 or 1923), it is likely that the same case-drawing equipment was used by Winchester to make both the '06 and .270 cases.

There was already a "7mm/'06" type round in use in Europe, (the 7X64mm/7X65Rmm) which may account for Winchester's use of the odd size bullet rather than just making theirs a plain-Jane 7mm.

However, prior to the advent of the .270 Winchester, there was a 6.9X57mm military Mauser-type cartridge being made for China, the 6.9X57mm Chinese. This cartridge used the same diameter bullet adopted by Winchester for use in the .270 WCF. So the .270 WCF was NOT the very first .277"-.278" cartridge in the world. Were the Win. engineers in 1917-23 aware of the Chinese cartridge?