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Expander Mandrels: Stainless or Carbide? Clarified the Question

Jay Christopherson said:
JRS said:
If you'll take advantage of hBN, the use of SS mandrels becomes a nonissue.

I have a bunch of hBN from when I thought I might try it on bullets, but I never considered using it on a mandrel. What are you doing?
PM sent, Jay. Trade secrets, not to be disclosed ;)
 
I use imperial lube on the regular steel. Same mandrel for 20yrs both expander and turning. I turn new cases for each match plus do some for friends that dont have the fast setup i have. I figure ive turned thousands and ive never adjusted the cutter or done anything except brush it out with an old toothbrush. Still cuts like brand new with no galling. Guess im lucky!
 

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