I bought a used set of 30-30 RCBS dies. I noticed after trying to seat my boolits, that there was a heavy amount of lead shavings. I unscrewed the rod with the expander on it and measured it. I got a size of .306 for the expander. Is this correct? I know this set of dies belonged to a guy who was into machining. I was wondering if the expander should measure around .309, and if maybe the prior owner of these dies reduced the diameter of the expander to get a tighter fit.
My cast boolits are sized to .310 and I have to balance them on the case mouth before I run them into the die for seating. I can't even get my boolits to start into the case mouth.
What should the expander measure?