I have some once fired 6.5x47 cases at home, I'll give them a try in the RCBS shell holder (same as .308) tonight.
The case head expansion may or may not be a big deal, I wish I had my notes handy but I know that the unfired brass will expand a bit to fit the chamber, but that seems like an awful lot. I'll look at my measurements as well. Hopefully it is just a tight shell holder.
BTW I had the same experience as you with the accuracy of the cartridge. I'm a n00b rifle shooter and with a bipod and rear bag I was able to group under half inch at 100 yards consistently.
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