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There were, apparently, plans to adopt the .0303 as a rimless cartridge (presumably with a 'crimped rim' like the .30-06,) only to be stymied by someone or other in the process. Lets say that, for whatever reason, they don't.

Does anything actually materially change? The biggest potential would be the potential creation of a Semi-Auto rifle, but would the simple fact of a rimless .303 be enough?

Postscript: Yes, technically the adoption was in the 1890s. However, I would imagine that any actual change, should it occur, would take effect in the 1900s, hence placing it here.
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