So you're shooting 6BRA not straight BR? I have a Cortina small base mandrel die, but the Wilson 6BRA sizes more than the Cortina die does on my lapua brass.My Peterson 6BR brass is on its 8th firing and going well
Finally had it out yesterday for some pew pew time.
I use a Wilson die(6BRA) and a cortina mandrel holder that also sizes the base.