I was shooting my Lapua just yesterday, it really liked 250 Lapua Scenar with Rel 22 and Fed 215M.
You can't use the Lee Hand Primer with the Lapua, you'll need the RCBS version or use your press to prime.
I have standard RCBS dies and they work well. I have a Redding shell holder, I don't remember what size and I am leaving tonight to go deer hunting, so I can let you know on Thurs if no one else does.
Let me know if you need anymore info.
Jim