So who makes the straightest/truest mass produced action?
I do have the equipment and the knowledge to do this but I don't have the actions (anymore).
If everyone wants to chip in and buy one of each (3 would be a more meaningful sample), I'll gladly (gleefully might be a better word) measure them and produce a chart of the results.......
On a serious note, out of the many Rem 700s I've worked on, I have seen about 5 that required no work at all. Of those, about half were dimensional concentric on the outside surface too. So even if folks did send me the actions, we still have those pesky details called statistics (and tolerances) to contend with.
I can also say that ALL of the custom actions I have worked on required no work. That includes Stiller, Pierce, Borden, and Defiance. My favorites were the Pierce and Defiance, but I can't say how they fare statistically. I would never be afraid to recommend either one to my best friend.
So, at the risk of starting a war...... I must admit that I still favour the factory Rem 700 action over all other choices. Yes, you can get better shooting rifles out of the box from other volume makers, yes you can get a "no work required" custom 700 clone, but ... In my eyes, the 700 is a diamond in the rough. They may not be perfect out of the box, but with work, they can ALWAYS be made to shoot lights out. Sometimes it's just a little work, sometimes it's a lot of work, but it's ALWAYS possible.
I cannot say the same thing for other high volume makers.
Another point that needs to made or asked here is "why are most of the custom actions basically 700 clones"?
Last but not least, I cannot speak for other smith's, but there has to be a reason why so many of us like doing 700s. I'd be willing to bet its because we love happy clients! Nothing beats success.