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Would I be correct that because a 9 mm or other semi-auto case being that the head spaces is on the rim of the case that having such case a bit short would not really be a problem?
Tom
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No. Because of relatively small internal volume of pistol cases any bullet setback raises pressure. Some high pressure cartridges as .40S&W loaded with long 180g bullets have such a small margin that going from 1.140" OAL to 1.050" OAL ( only 0.090" setback) raise pressure from 26000psi to 51000psi. That is reason why most of 180g .40S&W are loaded on "milder" side than say 155g or 165grainers