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30BR ?

The Robinett V2.0 reamer is a .331 neck. It's also a smidge bigger at the back end that the original 30BR Robinett...of which there is only one real version.

When you mechanically neck up from 6 to .30, the 'lump' at the base of the new neck measures right at .337. Trying to do a 'no turn' 30BR on mechanically expanded 6BR cases.....the neck diameter would have to be large enough to accommodate the 'lump'.

The 'lump':
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Good shootin' -Al
 
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I believe you have to turn brass for a Robinet chamber .330 I would order a .334 if I didn't want to turn brass. Is this correct?
For the .330 neck chamber turning the necks to .098 gives app. .3275 loaded neck diameter. This seems to be plenty of neck/chamber (bullet release) clearance and gives the carbon trace sine-wave pattern on the necks when fired.
 

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