I can do sometesting on a bolt and trunuon but it will be awhile before i get to it. I need to really get my shop in better order so that this hobby is not a s much of a chore and more fun. Im going to have a 243 up and runing very soon how ever and it will be a screw build so I suspose I could swap in your spare trunion with some sort of a barrel on it to test pressures. one of those sarco barrels would be good for that or for that matter a 308 barrel would work its not like im likely to hurt the barrel and if I did so what.
the tricky part would be estimating the pressures and what were really testing. It would be nice if there were poroof loads you could just buy. Or if there was some published data that had those loads listed. maybe some one with the load from a disk can help there. i will need to round up a chrony as well that way i can verify the speeds. if the speeds are high and the primmers are flat and the cases are starting to stick Im guessing ( only guessing ) that we would be in the 68,000 + range. a 22-250 can run as high as 65,000 PSI with out flat primers or other issues so it would be a start.
Id be happy if I could run 52,000 PSI with any of the 308 family of rounds as that is the middle of the road for most of them. and those pressure will perform very well in at those pressures. in fact id be surprised if maony factory commercial loads were close to that number. I cant even get close to many of the max loads in my lyman book with out flatening or blowing primers so why worry abut it? 52,000 is pleanty or even 50,000 PSI for that matter. hell the 300 savage with only 45,000 PSI will move a 130 grain bullet at about 2850 FPS . that is around 400 FPS faster than the x39 with a slightly lighter bullet. AT 50,000 PSI ( above 300 sav Sammi specs) it will give well over 3000 FPS. give that round 50,000 psi with a 150 grain pill and your going to do close 2800 or so. that is pleanty for any thing that walks around in north america
If you wantto send me a bolt and trunion ill load it till some thing moves or blows and report back.