Expander diameter and the neck diameter of the die both play a part, and Forster will hone the neck diameter at your request. All resizing dies have variations and the expander is blamed when the neck of the chamber and the neck of the die work the brass the most. I bought a Forster .223 die with the intentions of having the neck honed but all that was needed was to polish the expander. This expander only expanded the case necks less than .002 and on some brands of brass it hardly touches the inside of the case neck.
Are Your Sizing Dies Overworking Your Rifle Brass?
http://www.massreloading.com/dies_ov...ing_brass.html
FL Bushing Dies vs. Honed FL Dies
http://www.accurateshooter.com/techn...honed-fl-dies/
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