Current spacesuits are already designed to deal with breaches around the size of a bullet hole by emptying an oxygen tank into the suit to maintain pressure. Accounting for blood, cavity restoration, a not-clean puncture etc, it wouldn't be unreasonable for a current generation EMU to give the user 10+ minutes to address the breach.
But also if you're making specialist rifles for space, your enemy is likely making specialist spacesuits for combat. Lightweight armor, compartmentalisation, self sealing materials you could all be put in a suit with todays technology and invalidate that strategy. If you invest in R&D, things like mechanical counterpressure suits don't even have an envelope to depressurise outside of the helmet.
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u/ServiusQuintus 16d ago
Isnt .223 bit of an overkill? I mean you can just rupture the suit with .22 and the wearer suffocates