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Dangerous to fire or attempt to fire 57mm case in it. Approximately 1/4" or more of headspace? It could blow up first shot if the rim jumps the extractor when the pin hits it.
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Wrong! This is a break-open gun using rimmed cartridges with a solid rim recess in the barrel. The rim cannot "jump an extractor" as in a repeater. As the 8x57IR headspaces on the rim, just as the 8x65R does, there is no excess headspace. Just the forward part of the case will fireform out and loose almost all neck.
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