Depends on the trigger....
...... Not all Jewell triggers have the same length of sear engagement depending on how old or new they are. The cocking pieces on BAT's are usually the same length. The important thing is to get enough firing pin travel to properly ensure good ignition. I have found that .230 plus or minus usually gives you that.
I have had or help install triggers on several DS's. I usually start out at the zero position and measure the difference between the fall in the cocked and the fired positions by using the slide protrusion on the end away from the dial on a set of calipers and indexing it against the back of the shroud. (Pretty crude but it gets you close.) The sound of a good solid snap when it is fired on a chamber with a fired round (spent primer) also is a good indication. You can move it out to get to .230 by changing the setting.
Also, too much firing pin fall is also not a good thing. How it shows on paper is the ultimate test. But, the zero setting has seemed to be pretty good with the latest batch of triggers.