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I'm not sure that can be right. I've got Bont Riot size 49. Their size chart says the 49s are 320mm (last length) and to allow 2-4mm longer for your feet. They fit my feet perfectly.
The Sidi Genius 52s I've got are about 1.5-2cm too long for my feet. The Sidi Eagle 50s I've got fit me fine, but could possibly do with being a little wider at the toes.
Additionally, an increment in euro size of 1 is equivalent to 5mm. So you can extrapoloate to get the length for size 50 etc
Size 48 is 290mm. So 52 would be 310mm. You would want a bit of wiggle room for socks so if your 310 measurement is accurate, I would aim for 52.5 or 53.