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Bolt face diameter

MFG_BOP

Hi guys. Does anyone know what bolt face counterbore diameter Falcons or Turbos use (single shot) or even an acceptable diameter? I know SAAMI specifies .278" -.012" for rimfire ammo rim (just measured a RWS and it is .271"). I am making one bolt so I just want to assure I don't commit any mistake. Any input is appreciated.
Regards
 
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