Realy it is as simple as how the case fits in the chamber.
And I can change my head space from NO Go (and have ammunition that shoots fine) all the way to field reject (deponent on the gun, if its control round feed it will likely fire as its held in place by the extractor if is push feed then it will not (tested) as the case rim never engages and it just gets pushed into empty space)
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OK.Old guns or abused guns can wear and develop a longer head-space.
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I disagree with that. You can eat the throat out but the chamber shoulder does not which would change the head-spsce.
The Model of 1917 Enfield (30-06 WWI for those not in the know) does push head-space to filed reject.
Many military guns have more generous chamber for combat conditions.