Originally Posted by Dirtfarmer
Originally Posted by copperking81
I ditched the expander ball years ago and my concentricity improved immediately. You can use the Lee collet die or pick up a mandrel body like this one...

https://www.sinclairintl.com/reload...s-prod38807.aspx?sid=63474&pid=36422

Then just buy mandrels for your calibers. I use the "turning" mandrels which are cut to .002 inches below caliber diameter. "Expander" mandrels will get you .001 inches below caliber diameter. They're made in steel or carbide. Carbide supposedly doesn't require lube but is significantly more expensive over the steel variants.

Carbide turning mandrels....
https://www.sinclairintl.com/aspx/search/productdetail.aspx?sid=63474&pid=36422

Steel turning mandrels...
https://www.sinclairintl.com/reload...s-prod33136.aspx?sid=63474&pid=36422



Lee Collet neck sizer is less expensive than the Sinclair system.

How does concentricity compare between those two systems?

DF


I don't have any Lee Collet dies so haven't compared the two systems. I can't imagine there'd be any difference though.



Last edited by copperking81; 07/09/20.