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Jack O�Connor�s dedication to the .270 Winchester which originated from the early 30-03 military cartridge case (not the 30-06 as is widely believed), convinced many American big game hunters who wanted accuracy without a wallop of recoil, to try the cartridge. Ironically, O�Connor and another popular gun scribe, Idahoan Elmer Keith, clashed over the favorable aspects of the .270 versus the 30-06 in a battle that wore on throughout both writer�s long lives.
- A .270-ist never runs out of conversation
By Paul Bruun
Jackson Hole News
Date: October 18, 2006
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So this guy Paul Brunn (I assume that you are quoting him) writing in the esteemed gun magazine The Jackson Hole News, is the world's greatest authority on the .270, and Jack O'C doesn't know nothing.
Lee, get back on those meds.
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He is one of several authorities I have posted, but if you have one from New Zealand, post it.
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He is one of several authorities I have posted, but if you have one from New Zealand, post it. It's already been proven that 2 of the authorites you cited stated the 30-06 was the source. Has anything that wasn't an outright lie ever been typed on your keyboard?
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That's strong talk from someone who hasn't posted any authority to dispute mine, who include those who knew Jack O'Connor, O'Connor himself, the Winchester Museum, the NRA Museum, Charles Newton - maybe they are all wrong, but I doubt it.
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.... O'Connor himself, ... Come on Lee, remember this? It's actually what brought this post back to the top. I obtained a copy of the 1964, second edition of O'Connor's The Rifle Book.
Pages 218-229, part of the chapter on "All Around Rifles", give the story of O'Connor's early adventures with the .270. There is nothing on the origin of the .270 in this chapter. O'Connor relates that he first learned about the .270 in a 1925 ad.
On page 17, O'Connor wrote, "The .270 is only a .30/06 case necked down with the same shoulder angle."
On page 94, O'Connor wrote, "The .256 Newton case was a .30/06 case necked to .256, and the .270 Winchester case is simply the .30/06 case necked down to .270 with the same slope of shoulder retained."
There is nothing in the book to indicate that O'Connor thought the 30-03 was the parent case of the 270.
--Bob Let's repeat out loud - "O'Connor said 30/06"
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The .30-03 case length = 65.0 mm
The .270 case length = 64.5 mm
The .30-06 case length = 63.35 mm
You can't neck down a shorter .30-06 case and create a longer .270 case with the same shoulder angle. That's why you have to start with a .30-03 if you want to make a proper .270 WCF.
O'Connor got it wrong, just like a lot of others, but he realized he was wrong after being corrected. He wasn't right about a lot of things where his knowledge was second-hand, just like today's people who buy the rumor 10th-hand.
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Actually, Jack O'Connor was a space alien.
His Starship missed the Roswell target, ...so he made the best of things....in the Tucson area.
The cartridge dimmensions did not come from this universe.
live with it.
Best wishes, for a Merry Christmas.
GTC Sorry case really. They took away his Kahuna-hood and he just fell to pieces . . . .  BMT
"The Church can and should help modern society by tirelessly insisting that the work of women in the home be recognized and respected by all in its irreplaceable value." Apostolic Exhortation On The Family, Pope John Paul II
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The .30-03 case length = 65.0 mm
The .270 case length = 64.5 mm
The .30-06 case length = 63.35 mm
You can't neck down a shorter .30-06 case and create a longer .270 case with the same shoulder angle. That's why you have to start with a .30-03 if you want to make a proper .270 WCF.
O'Connor got it wrong, just like a lot of others, but he realized he was wrong after being corrected. He wasn't right about a lot of things where his knowledge was second-hand, just like today's people who buy the rumor 10th-hand. Excuse, I am going out to the hog barn now. Less manure odor. BMT
"The Church can and should help modern society by tirelessly insisting that the work of women in the home be recognized and respected by all in its irreplaceable value." Apostolic Exhortation On The Family, Pope John Paul II
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That sounds like a good place.
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My answer from a couple of days ago. After WW1 Winchester took note that Newton was winning the speed race with his 256 and 250 Savage, (1915) and yes the velocity race was real. They, Winchester looked to the eastern 7mm/.278 dia. to base or convert the 30 Govt. to win that race.
Where else would they come up with that .277 dia.?
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Campfire Ranger
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Actually, Jack O'Connor was a space alien.
His Starship missed the Roswell target, ...so he made the best of things....in the Tucson area.
The cartridge dimmensions did not come from this universe.
live with it.
Best wishes, for a Merry Christmas.
GTC Sorry case really. They took away his Kahuna-hood and he just fell to pieces . . . . BMT  Casey
Casey
Not being married to any particular political party sure makes it a lot easier to look at the world more objectively...
Having said that, MAGA.
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Americans thought in English units of inches: .45, .30, .25, .27, .28, with appropriate bore sizes adding 0.007 to 0.008 inches.
The US Army had already lost a patent infringement suit with Mauser over the .30-06 and the spitzer bullet. Mauser already had the 6.5x55, 6.5x57 (.264), 7x57 (.284), 8x57 (.323), so using a metric bore was just asking for more trouble, even if the engineers had been so disposed.
Using the .30-03 as a base for the .270 WCF not only gave more powder and the desired shoulder angle, but avoided using a cartridge that had spawned several lawsuits.
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Americans thought in English units of inches: .45, .30, .25, .27, .28, with appropriate bore sizes adding 0.007 to 0.008 inches.
The US Army had already lost a patent infringement suit with Mauser over the .30-06 and the spitzer bullet. Mauser already had the 6.5x55, 6.5x57 (.264), 7x57 (.284), 8x57 (.323), so using a metric bore was just asking for more trouble, even if the engineers had been so disposed.
Using the .30-03 as a base for the .270 WCF not only gave more powder and the desired shoulder angle, but avoided using a cartridge that had spawned several lawsuits. the 270 has the same case, and the same shoulder angle as the 30/06. It is effectivley a 30/06 necked down to 277, with a slightly longer neck. Or it's a necked down 30/03 with a slightly altered neck length (I guess). Who the heck cares? Lee24 are you saying that you know what the Winchester engineers in the early 20's were thinking? Perhaps you have had a s�ance? Otherwise, neither side can win, and what difference would it make anyway? Why don't we argue whether a 150 Ballistic tip at 2900fps works better than the same bullet at 2925fps...
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I am not arguing at all, just stating what I know, and there is a lot more. Maybe I should stop posting to deaf ears and write an article, using original sources.
Maybe we can start a thread on 150-gr bullets out of the .270 vs 150-gr bullets out of the .30-06 at the same speed.
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Based on the .30-06 with the length to bottom of the neck in the 0.270 longer than the .30-06 so that .270 cartridges could not be fired in a .30-06.
.270= 2.156
.30=06= 2.109
That's the standard story-right or wrong I can't confirm-that many said as far back as the 50's.
Battue
laissez les bons temps rouler
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I am...just stating what I know, and there is a lot more... Lee, do you suppose that your humility (or lack thereof) just might be the reason for your poor reputation here on the 'fire? Is this just your internet persona? Or are you like this in person, also? Just curious.
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Boys, step away from your computers. Go outside and shoot something. You'll feel much better soon.
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I do remember reading that Jack O'Connor said that if the .270 had only been available with the 150 grain bullet, that it would not have become as popular as it did, especially in the western states and open country.
The reason was the flatter trajectory of the 130 grain bullet at higher velocity.
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Google...Google...Google... yep, if the info is on the internet, it just HAS to be accurate. 
Sam......
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