300wm 175g Info?

[DirtySouth85]

We don't know if that's the sized empty case mouth diameters or a loaded round's outside neck diameters. Knowing the details will help.

DirtySouth85, how did you measure that?

That was inside case neck diameter.

I have fixed the issue since then. I wasn't putting enough pressure on the bottom of the downstroke while sizing the case. And that was allowing for variance.

User error of course.