One of the main reasons I prefer the Barnard to the stiller is that the Barnard is hard. There is less tendency for the lugs to gall. As you are aware, galling is a problem with most US made BR actions. I like the striker mechanism in the Barnard. I like the fact that the Barnard offers the option of seating the barrel on two shoulders; at the face of the receiver and the inner shoulder. From an engineering standpoint, this is more rigid.
I have just not been that impressed with the Stiller actions. That I have not built a BR rifle based on a modern custom action in recent years (not exactly true BTW) does not negate the fact that I know more about it than many of those who are currently active. BR shooters, just like everyone else, base their choices on the "cool factor" as much as anything.
All BR actions follow basic requirements and it is seldom indeed that we see anything truly innovative. For instance, no action has been designed to eliminate the upward pressure transferred to the bolt by the loading of the sear by the cocking piece. Savge does but it is hardly a BR quality action. Anyway, most target oriented actions address the basic requirements just fine. They are all straight, true and rigid. The Stolle (or Kelbly or the Stiller Viper) use aluminum receivers with steel inserts. Most others are really derivitives of the basic 40X Remington design. They are not all that complex.
I like the Barnard for the reasons I gave. I wouldn't turn down a Stiller but stick by my statement that the Barnard is a better value. In addition, just the fact that it is NOT American made is an advantage in these times. Regards, Bill.