I've read to check runout on the case neck near its junction with the shoulder as well as half way up the neck. Then once loaded, check the bullet close to the case neck. Was just reading article earlier today on 6mmbr site on the topic.Quoted from above post:
"(bushing dies are notorious for runout)"
First time I've heard this, when actually old style dies with expander buttons are a common cause of runout.
But on subject of measuring runout, I'm always curious as to what place on the bullet or case measurements are taken. Anyone care to comment? Please do.