Re: .338 lapua build
Seriously:
You really can't pick a bad action from a custom manufacturer. If you had one of everything all threaded/setup the same (threads, bolt face distances, etc) and fitted the same barrel to everyone of them and shot it, you'd be hard pressed to find one out perform another.
It boils down to materials and features you deem important to YOU.
I've used just about every custom action ever made by anyone. Even the ultra exotic stuff from Switzerland, Germany, and Austria.
Build the gun right and they ALL work.
Like I said, pick out what YOU like, get your gun built, and go burn up your barrel.
Chad