I have a question about the tuning of my FX M3 22 caliber 700 mm sniper. I have gone through the tuning that was recommended by quite a few of the forum members and as of this date, I have it set to shoot a 27 grain slug at 1000 ft./s with the regulator set at 129 bar .After shooting today I decided to bump the regulator higher and after reaching 135 bar, I noticed the speed was not increasing. It leveled out at about 1004 to 1007. Am I correct in assuming that this higher reg pressure would be the proper place to leave it considering the hammer at 16 is maxed out and was maxed out at the 129 bar setting. From what I understand this should use less air and give a sharper push to the slug going down range . Am I correct in assuming this please let me know . thanks in advance.
You're on the right track, I have the exact same gun. I hit a plateau a few bar higher than you but I was chasing a heavier slug with a higher bc (34 grain) so I went with the tungsten hammer and I'm running a bit low on the 2nd reg for that hammer weight at 145 bar. Perhaps the hammer weight washers from the slug power kits of old would help you by adding a little mass and a little spring preload. 150 bar is really where the heavy hammer weight starts to shine as I was told and found out, but I need to have a lighter projectile option down low (23 javelin and by chance mrd work)
If that's the slug you want to stick with, I'm of the opinion that you are at a good speed, because any higher and occasionally they're going to go transonic and increase bc in an incalculable way.... If your experiences are like mine.
I also found the huma style big window pellet probe was good for 7 fps for me and the pin probe was worth 10 and came with its own bad manners but I could adjust seat depth.
Once you go tungsten hammer and heavy liner the gun is pretty much married to barely shooting mrd pellets and all slugs ime.
So my gun is 145 bar, pin probe, tungsten hammer weight, heavy liner and I had to do the "power block" because mine is really early m3 as for power mods. The block seems like a safety fix for chasing power. The gun will run 55-75 fpe and I'm not maxing out the wheel or the micro to get there because it wasn't needed, it needs more plenum pressure to use it all. And my VA is only slightly closed from max travel just to even up the spread.
Just to reiterate, I think I have too much hammer mass for the pressure I'm running but only barely and several hundred yards is doable with your slug choice and speed I think because with 23 I could do 200 and with 30-34 I was hitting a paper plate at 400 yards that I saw up on a hill.
I hope this helps you think thru what you would or wouldn't like to do. I somewhat regret taking the gun this far because it was so good down where yours is at. 135 bar and the pellet liner let me shoot 5 projectiles well on one reg setting and just fiddle with the power wheel. 28 grain slugs being the max before groups fell apart beyond squirrel head shots with the pellet liner.
