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.510 Whisper is made from .338 Lapua Magnum. I found the Norma brass to be amazingly consistent in wall thickness even down there below the original neck.
The Whisper is interesting in that the shoulder and neck are not formed in, they are machined in. In other words, the interior of the case does not follow the outer, bottle-necked contour. The case wall just gets thinner at the neck.... part of why they are hard to make and thus not cheap, but JD Jones had his reasons for this and I think it is a clever design.
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