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Old December 30, 2012, 05:48 PM   #20
FrankenMauser
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Join Date: August 25, 2008
Location: 1B ID
Posts: 6,650
Oh, come on, guys.
Everyone always ignores the great-grand-daddy of so many 'Merican cartridges.

.30-03 (inspired by the Mausers) is the parent for .30-06, .270 Win, .280 Rem, and the Whelens (.35, .375, .400). - And none of the latter three are based on the .30-06. That's why they require a .30-03 neck length for proper forming.

(Edit: Now I see that Mike brought up .270 Win being based on .30-03, a bit earlier.)

The .280 Remington could be argued to be based on the .30-06, if you include elongating a case to be 'based on' one - i.e. .308 Win being 'based on' .300 Savage by being a stretched and modified version of it, or .30-03 being 'based on' 7x57mm by being an elongated and modified version of it.
But, as far as I'm concerned - if you add length, you're creating a new cartridge.

If you can't take the 'parent' and form the 'child' directly from it... it ain't part of the family.
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