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This questions is along the same lines as the post about .17 Rem. question. I got slammed on another Forum for sugesting that the .270 was designed off the .30 Govt.(30-03) and not on the 30-06 case. overall case lengh for the .270 and .30 Govt. is 2.54" and the O6 is 2.494". so therefore winchester would have had to lenghen the neck of the 30-06 by .046". A 30-06 with a .046" longer neck is dmensionaly identical to the .30 Govt.
What say you??
Richard
~Molɔ̀ːn Labé Skýla~
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IMHO, that's just nit picking. Since the .30-06 replaced the .30-03 it's just common practice, IMHO, to say that certain cartridges are based on the .30-06 case. Examples, in SAAMI standardized cartridges, are the .25-06 Rem, 270 Win, .280 Rem, .338-06, and .35 Whelen. Small differences in case length (or shoulder angle) are a minor point. Heck, the .280 Rem even has the shoulder a little further forward than the others but the designers of the cartridge (Remington) started with the basic .30-06 case dimensions and then just made slight modifications.
By the way, the .30-03 and the .30-06 are really just lengthened versions of the 7x57 and 8x57. The rim and base diameters are the same. Similarly, the . 300 Win Mag, .338 Win Mag, and the .350 Rem Mag (as examples) are based on a shortened .375 H&H case.
My two cents...
Cheers!
-Bob F.
"Whose bright idea was it to put every idiot in the world in touch with every other idiot? It's working!" -- P. J. O'Rourke
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This questions is along the same lines as the post about .17 Rem. question. I got slammed on another Forum for sugesting that the .270 was designed off the .30 Govt.(30-03) and not on the 30-06 case. overall case lengh for the .270 and .30 Govt. is 2.54" and the O6 is 2.494". so therefore winchester would have had to lenghen the neck of the 30-06 by .046". A 30-06 with a .046" longer neck is dmensionaly identical to the .30 Govt.
What say you??
Richard Have you ever necked a 30-06 down to .270? It comes out of the sizer die with a longer neck.
"Before you criticize someone, walk a mile in their shoes. That way, you'll be a mile from them, and you'll have their shoes."
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NRA Lifetime Member
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This questions is along the same lines as the post about .17 Rem. question. I got slammed on another Forum for sugesting that the .270 was designed off the .30 Govt.(30-03) and not on the 30-06 case. overall case lengh for the .270 and .30 Govt. is 2.54" and the O6 is 2.494". so therefore winchester would have had to lenghen the neck of the 30-06 by .046". A 30-06 with a .046" longer neck is dmensionaly identical to the .30 Govt.
What say you??
Richard Have you ever necked a 30-06 down to .270? It comes out of the sizer die with a longer neck. Yep,Thats why you trim to length.Not only that ,some times you have to neck turn them because it thickens when necking down.
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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This questions is along the same lines as the post about .17 Rem. question. I got slammed on another Forum for sugesting that the .270 was designed off the .30 Govt.(30-03) and not on the 30-06 case. overall case lengh for the .270 and .30 Govt. is 2.54" and the O6 is 2.494". so therefore winchester would have had to lenghen the neck of the 30-06 by .046". A 30-06 with a .046" longer neck is dmensionaly identical to the .30 Govt.
What say you??
Richard Have you ever necked a 30-06 down to .270? It comes out of the sizer die with a longer neck. Yep,Thats why you trim to length.Not only that ,some times you have to neck turn them because it thickens when necking down.
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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Campfire 'Bwana
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Huntz, we heard you the first time......
I got banned on another web site for a debate that happened on this site. That's a first
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Parent case for the .270 Winchester was the .30-03
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Campfire Kahuna
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Parent case for the .270 Winchester was the .30-03
Prove it.
Last edited by VAnimrod; 12/13/07. Reason: Putting Lee24's quote in there for the record
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Google...Google...Google...
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Parent case for the .270 Winchester was the .30-03
Prove it. According to a well-known  internet source, Wikipedia  : The .270 Winchester was developed by Winchester Repeating Arms Company in 1923 and unveiled in 1925 as a chambering for their bolt action Model 54[2]. The cartridge is based upon the .30-06 Springfield, and the case is slightly longer due to the necking down process.
The real question: Can the .270 Win be ackley improved? If so, what gain in velocity can someone get out of it with 140gr. bullets?
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Yes, the .270 win. can be Ackley improved, but Ackley himself said that there was not enough gain to be worth it.
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stop asking these stupid questions. 
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Off topic but hntnnut you sure live in some beautiful country. I was just there on a G3 hunt. I love the eastern Sierras. Too bad you fellows can never draw tags to hunt in your own backyard. I got a pard up in Independence that's been putting in for G3 for years and never been drawn. You ever do any coyote calling? I never saw any while I was there but I figure they gotta be there. Did see 2 golden eagles soaring over Division Creek. That was quite a sight.
NoCAL
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Who cares? I just buy factory brass and start reloading.
I suppose the same question could be asked about the 25-06. I've got one of them too and I do the same: buy factory brass and reload.
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I used to try to make 270's out of FA 60 brass. By the time I got the necks thinned down enough to chamber and trimmed down to length, I figure my time was worth about 35 cents per hour.  Wayne
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Huntz, we heard you the first time......
My finger stuttered!!! 
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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If you depend on Google or Yahoo, you will get a lot of wrong answers. Most people mistakenly believe that the .270 is just a necked-down .30-06.
Actually, the basis for the .270 was the .30-03.
The .270 case length is 2.530. The .30-06 is 2.484.
My original source was Jack O'Connor's 1964 book on hunting rifles, where he describes how he heard about the .270 being developed in 1923, and put himself in line to receive one of the first ones to try. I also discussed it with one of the famous builders of .270 custom rifles, Paul Jaeger, in 1968. Later sources include visits to the Winchester factory and conversations with their engineers. You might also refer to the Buffalo Bill Museum in Cody, Wyoming, and The Winchester Book, which I think is in reprint now.
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stop asking these stupid questions. It's more interesting, in an arcane, non-consequential way, than anything I've ever seen you post. So stop making these stupidly snide posts... DN
"The more you run over a dead cat, the flatter it gets."
"If you're asking me something technical, you may be looking for My Other Brother Darrell."
"It ain't foot-pounds that kills stuff -- it's broken body parts."
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The 30-03 was dead & buried before the 270 was born.
Mike
Always talk to the old guys , they know stuff.
Jerry Miculek
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