Quote: I've experimented quite a bit and some times with some dies having the expander button backed into the die closer to the top has helped some.
Then keep in mind if the necks are thicker on one side runout won't be good.
^^^^this
Spent a lot of time/effort minimizing runout for long range ammo. IMO doesn't make enough difference to worry about out to 200...maybe 300 yards.
The expander plug in sizing die will tend to pull the case sideways a bit as it is extracted due to the fact that most shell holders only support case 180*. A carbide expander set as close to the top as possible helps. A bit of graphite inside case neck also helps reduce friction as expander pulled out of neck.
Before they made, or at least before I ever heard of bushing dies, I contacted RCBS and had them ream out a well worn RCBS 30-06 sizer to proper diameter for (neck turned)cases in my rifle allowing me to remove expander plug altogether.
They requested two or three cases fired in my rifle and I sent them along with my die. Couple of weeks later I received the die @ no charge. GREAT customer service.
After RCBS tuneup, most cases measured
