The bolt on my CZ 550 chambered in 404 Jeffery does not "run" as smooth as I'd like. But then I got to thinking how smooth is smooth. I contacted Von Gruff and asked him for some hints as to where to proceed. Accordingly I've purchased some layout bluing to apply to the bolt and am prepared to do that and then insert and cycle the bolt to see what might be rubbing and polish the areas indicated. The question becomes when to stop "polishing" the bolt and action mating surfaces. I'm looking for a pragmatic test rather than somebody saying "when you're satisfied with it." I was thinking that their might be an angle at which an open bolt should be free running. Last week someone posted a video of a MS bolt closing and locking itself when the muzzle was tipped below horizontal by 15/20 degrees. For those of you that have what you consider satisfactory bolt actions how far do you need to tip the muzzle and or the stock for the bolt to travel freely of its' own volition. I suspect the bolts on upper end rifles might move more freely at lesser angles. To that end "am I beating a dead horse" in trying to get my CZ to do the same?