K&M - Expander Mandrel Powerstroke Micro Seater This can be measured by

This can be measured by using the Case Gage Depth Micrometer

You can drive the cartridge with the power adapter and proper shell holder by hand when the handle is installed or remove the handle from the power adapter and insert the ¼” hex stem into a cordless screwdriver

Brings underweight charges up to accurate readings fast

260 rem etc

K&M - Expander Mandrel Powerstroke Micro Seater This can be measured byVirgin competition Brass isnt quite ready to Neck Turn when you buy it. And the commercial die manufacturers have no set standards for the Expander button in their dies. Large variations from manufacturing to manufacturing and even within a given manufacturing makes it necessary to properly size the inside diameter before turning. Dont be fooled by slick talk. The turning pilot cannot be used to correctly expand the case neck because of the elasticity