When shooters ask me what chambering I would build for a custom Rifle that will see bench time,as well as woods time, I say, "one that Lapua makes brass for".
The same can be said for components like triggers. Building a $3000 Rifle with a great Custom barrel, properly 'smithed, and completely functional can be a heartbreak when you are among your buddies at the range if you can't get a decent trigger.
Of course, companies have been making pretty decent triggers for Mausers since the '50's. By decent, I mean you can squeeze off a round without upsetting the Rifle.
I have checked the trueness of a couple of military Mausers in my life, and you would be surprised just how well they were machined. Of course, all of that bolt flop makes some of it a moot point, but they are certainly not pieces of junk.
The absolute worst action I have seen to date was a Winchester I bought a few years back, (a cayote, new in the box), with the thought of building a 25 WSSM. I removed the barrel, and the threads looked like they had been machined with a cold chisel. I tuned a mandrel to fit the bolt way, and placed it up on it to see how bad other things were. The face ran out .004, (that is a LOT), it didn't even look like it was machined. The threads ran out with the bolt way so bad, that I decided to just lay it aside and forget about it. I ended up selling the whole thing for about 1/2 what I gave for it. Total piece of junk........jackie