So this is my first time using the expander mandrel. I just got in the mail a whidden gunworks click adjustable full length bushing die for my 300 prc. I ordered the Sinclair expander die and the 30 cal carbide mandrel before the sizing die. To my understanding, people are just taking the expander ball out of their Redding or similar bushing dies, sizing the case and neck with the bushing, and then running the brass through the expander die to expand it. My first question is, do the whidden dies have an expander mandrel or do they come with the ball, to me it looks like a mandrel and I can post a picture of what I got if you guys want. My second question is, can you guys explain your process when setting neck tension with a bushing die and expander mandrel? Without turning necks. From my understanding a guy would select the correct bushing after measuring the neck of a case with a bullet seated in it, size the case with said bushing, and then run it through the expander die with the mandrel. Am I missing something or just overthinking it?