The Lapua and Norma cases we used were both non-ballon-head cases, meaning the bottoms of the cases are flat on the inside. Hornady cases, at least the ones I’ve always received, _are_ ballon-head, so there would be a capacity difference between them and the Lapuas that one would expect to make a difference in pressure.
MZ5, thanks for the information. I'm assuming that any differences in case volume due to the ballon-head/non ballon-head would show up in weight differences, as would case thickness differences?
