Keep em coming...some of yall are cheating with those powder burners, lol. beautiful guns though!
Here is another configuration of the gun I started the thread with. It becomes a bit more useful in this configuration.
I used learnings from the GTA community's Simplified Balanced Valve development to modify a stem/poppet for my Cothran that allows for it to be tuned via hammer spring tension and produce a bell curve. Without bogging this thread down with those details, the foundation of this modified stem is 3 things. 1) Change the seal to delrin which is more resilient than the soft nylon Don designed the valve to use. 2) remove the rod from the stem, this causes the valve to close violently, hence changing the sealing material to delrin. 3) enlarging the stem vent. It's a bit more complex than that, but that is the general idea.
This results in a very miserly valve, yielding a very flat shot string that can be moved up or down in energy by dialing in/out HST.
On a 2800psi fill, which is all I have in my tanks right now, it will get 8 shots within 17fps of each other.... Not many unreg'd big bore PCP's will shoot that flat across 1500psi pressure range
12" barrel with a bored out Koi. it is extremely quiet for a 60fpe hand cannon