Lube for expanding using pin

[Chris Edmondson]

Good explanation - so, essentially, the SAC expander mandrel functions like an expander ball in a conventional die but is technically more sophisticated.

Yes. The design also facilitates managing the degree of expansion in 0.0005" increments, unlike most ball-type expanders which typically default to 0.002" less than bullet diameter. With conventional designs you get to control NT with compression only (bushing), expansion is fixed. With the SAC modular die you get to control both compression and expansion. The additional degree of freedom however, comes with a price; the stuff isn't cheap!

 

[Timon]

I use SAC sizing dies and mandrels. I do not lubricate for the mandrel use, as the mandrel is carbide. When I’m seating I use Neolube No2. Been using this system for a number of years now.

Prior to the SAC dies and mandrels, I used a Whidden die and 21st Century steel mandrels. With them I used powdered moly for both resizing and expansion.