I'd also add, if going the Lapua Improved direction, then just buy a Sako TRG-42. New or used. I think a feller would be hard pressed to build a better rifle, in that chambering, for less money.
Also, in spite of all of the bean counting, big 338's are not cheap to shoot, and if one plans on actually shooting it a bit, it won't take long for the price of components to exceed the price of the rifle.

Just thought I'd try and help out.

R.

You can run, but you'll just die tired.