I played around with the calipers for a while now, and it turns out I was only remembering the minimum dimensions of the slug.


But I can find bigger measurements, too:


So I took 10 measurements randomly around each slug, and the average of one slug is .360" and the other is .362". So should I be using the absolute minimum diameter, or would these average measurements be better?

Also took a pic & measured the chamber cast. It seems to match the type E chambered 9.3x72mm R.