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caliber change for sdb

want get a conversion kit for my sig 229.all ready have two step 22 lr and 40 sw.looking at a 357 mag conversion will the sdB dies work with the 229 conversion to 357 sw.seems to be a caliber size difference to the 357 sw in sig conversion.any help will be well come.thanks 

You cannot load 357SIG on the SDB. The design won't hold headspace on a bottleneck cartridge.

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