[Scorch]

I blew the picture up and he did not measure the 0.470" across the rim. The measurement is actually just in front of the rim re: case body

I didn't say he measured the rim, I said he measured the case head. The case head is not the rim, it is the point in front of the rim. The case body diameter is farther up the case and can vary because many cases are tapered. The points to measure are the case rim, the case head, the shoulder if any, the case mouth, and the case length.