Re: Sako TRGS and .338 Lapua
McMillan will not inlet for a Sako TRG-S action, only the 75 and AI-AIV (I just asked them last week).
I have not had a problem from my TRG-S stock (also a 338 Lapua). I don't like the design, MPI and David Lake will custom make stocks for them ($470-$600). As far as the scope, I have a Burris on mine (for 3 years) and never had a problem with it. I'd have to agree with Dave, it sounds like a user problem.
Learn from others mistakes, you won't live long enough to make them all yourself