Steven Meyer might add some info but you might just need to take a little off the rim and then load. It's not that uncommon to modify the brass a bit. I shoot a good bit of 6.5X52R as well as 6.5X41R. Have you done a wax chamber cast? What year proof is yours? I think I have some info on Zi-Di somewhere.

Kind Regards,

Raimey
rse