I do the same as I was planning on a 458WM..
CZ 550
Machine in Talley bases ( lowers the mounting height and lets you use "standard" Talley mounts and a Talley Peep )
Straighten bolt handle
Timney Trigger
Wiebe Bottom Metal, for 6-7 rounds
3-pos safety
Add barrel banded sights
McMillan Stock
And, have everything polished up..
