Well today I had some time to test the 125gr nsa. I opened up the ports some more to max that material will allow and bumped the reg to 170 bar. Got 867fps or 210fpe so thats great! 300 bar fil down to the reg got me 9 shots plus a couple follow ups only slightly lower velocity so Im pretty happy with it. Now to test accuracy….
I actually did see that one! Pretty cool. Im very suprised this barrel shoots pellets this fast being a 16 twist. If tj’s ever decides to answer me back, I might order a blank from them.
Thats how you learn the concepts. I've learned a lot from Bob. Your design/execution looks very good.
That's a pretty good hunting rig group right there! Any luck with getting a TJ's barrel to mess with? Since you like to tinker, some food for thought... I've often wondered what one could do with tuning a barrel's length to the gun's power and projectile. Once a desired balance of max power and shot count is achieved (as you have done here) then the ideal length is worked on based on velocity and accuracy.
I ordered a 26 twist 31” blank. I prob wont get to it this season though. I would expect 100+ more fps, around 220fpe. However, I just sent off a really really cool shroud assembly to get hard annodized. Its very similar to a donnyfl core, with some changes. The inner core is 11” of baffles, 1.25 dia, and has a m18x1 on the end to add an additional ldc. Id loose all that with a longer barrel. I did figure out that leaving the hammer and spring alone and just swapping jets can take power to 190fpe, down to 65fpe. A jet around .058” makes 90fpe with pellets and is alot of fun! Super high shot count and wicked accurate. If I was clever enough to swap the jetting with a needle and seat and make it externally adjustable, Id be on to something lol
