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A crack at the case neck is almost never the result of excess headspace. With steel cases, it can be the result of an oversize chamber, common in wartime rifles firing rimmed cartridges. (Brass cases will expand to conform to the chamber; the less ductile steel cases will crack.)
A crack or stretched area running around the case 1/4" or so ahead of the rim, or a case with a separated head, is ALWAYS the result of excess headspace.
Jim
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