Re: stiller predator vs. lawton 7500.
The Stiller Predator is advertised as a "hunting action". That is why you see the tolerances open up a little - its designed to be dragged through the mud, snow, and dirt then put a bullet behind the shoulder of an animal. The Lawton 7000 will do this also.
In my opinion, the Lawton 7500 and some of the other high end actions are built to be benchshooters w/ ultra tight tolerances, which produce ultra tight groups. There are alot of good actions out there, you just have decide what its purpose is going to be.