When purchasing RCBS or any other brand from eGoods365.com store, you can be sure that (a) you are purchasing from US based company with the most responsive and friendly customer service; (b) an authentic, not a counterfeit and not a refurbished product.
To determine the proper neck bushing size measure the outside neck diameter of a loaded cartridge and subtract .002" to .003" to allow for a small amount of brass spring back.
