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No free bore? So the leade starts right at the step? Where did he get a reamer like that?
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Shooters (especially match ones) will sometimes order a custom reamer sized specifically for a particular cartridge/bullet combination to optimize the chamber and freebore for the characteristics of that one combination sometimes with a "no jump" fit. The Robinette 30 BR I have is a good example of that. It can yield dramatic improvements in consistency--but by the same token can limit the range of choices for experimenting. As far as I know, most top tier barrel makers will chamber the barrels you order from them to specific freebore and neck diameter characteristics for a unique cartridge configuration that you supply to them--though if they don't have the reamer to match you might have to pay for it yourself.