Maybe I'm confused here, but when the O.P. said he makes up 20VT brass I assumed he meant from LC223.
If you just neck down Rem 221 fireball a .232 nk chamber is all you need.
Lapua I would go .235 and have the .200 line .002 bigger than a reamer set up for Rem 221 FB brass to avoid clickers.
Theres a big difference to making 20VT brass from LC 223 than just simply necking down 221 brass
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