Sinclair Expander mandrels

[kelbro]

I recently found a Sinclair expander mandrel set that I bought long ago to go with my Forster hand neck turner. I just looked it up and the current models show -.002 for trimming and -.001 for expanding. All of the mandrels in my set measure -.002 but they are SS not carbide. Did Sinclair upgrade these at some time?

I don't remember ordering trim specific mandrels since my Lee collet dies make for a very good fit on the Forster pilots.

Where would you use this tool with the -.002 mandrels?

 

[gdbleb]

I thought the -0.002 mandrels were for neck turning as they had clearance to permit case rotation.
Carbide mandrels are quite pricey.
TIN coated mandrels are a step up from SS to try to avoid galling - which is an issue with plain SS expander mandrels.

 

[muleystalker]

The one that is .001" under is an "expanding mandrel" you use before neck turning and the other that is .002" under is a "neck turning arbor" used on the neck turning tool.

 

[kelbro]

Thanks. Trying to jog my memory.

 

[Tangent]

I've bought the carbide mandrels. Not cheap but should outlast me! 0.002" under seems to work well on the cartridges I've tried them on.