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The best-30-06-based-cartridge..???

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My first thought the real parent is still the best, the 7x57mm.

And if it must be a longer case, the 7x64mm.

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You mean the 8x57. Correct me if I am wrong but did not the 7X57 come along after the 8?

My personal preference is the 35Whelen followed by the 270. Of them all the parent case is the least desirable for me. I have several 308's and a 300SAUM.

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I thought the 7x57 was first but per Chuckhawks, the 8x57 was four years earlier. However per Chuckhawks the .30-06 was based on the 7x57. If they are correct that is.

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8x57mm Mauser

From the standpoint of the bolt action rifle user, the 8x57mm Mauser is the cartridge that, more than any other, is responsible for the success of the type. Designed in 1888 for the Mauser military rifle, the 8x57 quickly became the standard upon which later rimless cartridges were based, including the famous 7x57 in 1892.

The U.S. Army's .30-06 cartridge, covered elsewhere in this article, is actually an enlarged 7x57 and shares the 7x57's .473" rim diameter and basic design. Actually, the 7x57 appears to be the more modern cartridge due its sharper 20 degree 45 minute shoulder angle. (The .30-06 uses a 17 degree 30 minute shoulder.)

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30 06 is a 8x57 copy and 6 mm longer because american made powder dont reach the quality of german powder so they need a longer case to get 8x57 ballistic.

7x57 is not a 8x57 necked down but have a bigger base diameter and the shoulder have another position.
CIP maximum for the 7x57 case is 12,10 base diam.
the 7x64 is a 8x57 based case with a CIP maximum of 11,99mm

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