You guys need to check all your shellholders. Look at the offset in this RCBS #10. You can see how far off to one side the primer is. I also had an RCBS that was improperly machined causing contact with the bevel at the front of the extractor groove in the cartridge base [ I wonder if it was this shellholder, hmmm]. The case wouldn't sit on it's base, it was sitting on the bevel.
