The one thing that is a issue with the inline valve is getting it to close after a shot. Especially with larger valves.
One thing no one talks about is the efficiency of the Huben . From what I gather , still trying to wrap my head around that one is it’s pretty much a dump valve . They aren’t known to be efficient . I must be missing a key point .
In theory, the smaller that distance, and consequently the smaller the total port volume, the higher the pressure at the base of the bullet before it moves.... I actually wonder if that is the reason that not retracting the nose of my bolt quite clear of the back of the barrel port gives a slight increase in velocity.... The nose of the bolt is restricting the flow area, but the initial pressure is higher.... resulting in more power....I seat my bullets just ahead of the forward radius of the barrel port....Bob