It doesn't really matter that the demo bullet doesn't have the same ogive shape as the bullet you use, nor does it matter that different bullets have different ogive shapes. You are determining the distance to the lands.
The distance to the lands doesn't change when you use a different bullet, nor does the diameter of where the land nut contacts it, and that distance is measured with the Precision mic in any case, and you use the land nut to get a reading and record it.
You simply seat your bullet using the reading plus whatever distance you choose.
For me, it was easier to use than the SP tool, and I only had to find the distance once. It is worth the money if you don't have another way to determing seating depth that works for you.
Smitty of the North
