EddyBo,
Of course your cautionary note is wise. But the OP is using WW brass in a factory chamber/throat, while you're using Lapua in a short throated match chamber.
While a workup is proper, I'll be pretty surprised if the OP runs into bad pressure with his combination at 46 grains. The last seven factory chambered rifles I've loaded for digested 46 grains under 165/168 grain bullets just fine in RP brass, and that has a bit smaller capacity than WW.
I hope you get to feeling better.
mm
