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Tadd, the extra thickness in the case web area is, indeed, meant to allow for higher pressures. That is absolutely why it is there. However, this extra material is still not enough to allow for its use in an unsupported chamber. It needs both to be safe - the thicker brass and a fully supported chamber to operate safely at the pressures it generates.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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