Here is an example of how to get that last bit of accuracy out of the M3 after you have entered the factory suggested tune parameters. Each caliber and pellet will have a different set of numbers that serve as the "starting point" to tune the gun.
This info is straight from the FX tech department. I followed what they said and my .22 M3 stacks pellets on top of each other at 70 yards. ..18.1gr pellets!
So I had entered the factory tune numbers for 18.1gr w/ a 700mm barrel. They were:
That made my gun shoot 930 feet per second. When I asked AGN how to tune it down to 890fps (pellet's best speed), I was told to "tune it to the curve of the knee".
about a week later the FX tech Melissa told me "Feel free to tune the valve adjuster (front knob) down until you reach the desired velocity. You can turn it until you reach line 4. If you still need to decrease velocity, adjust the Micro wheel down one notch.
…..BAM! I think this technique would apply to all calibers and ammo choices. For the recommended tune numbers just email FX USA at serviceusa@fxairguns.com
Her exact words (James also instructed me on this, hence the "line 4" info.)
The easiest way to slow the speed while maintaining consistency is the valve adjuster knob. Feel free to turn it in until you reach your desired speed.
If you start to notice sporadic speeds every once in a while you may have to back the valve adjuster knob off a little bit turn your hammer spring wheel down 1 notch and then readjust your valve adjuster knob. Just as a heads up in case this occurs you will already know how to address it.
Here is the 25.39gr tune for the 700mm Sniper M3 Impact. I will get the tunes for all other pellets and calibers as I film my M3 video series, .22 up to .357.
The first regulator should ALWAYS be set at 150 bar…that is across ALL CALIBERS from .177 to .357. Never shoot an M3 when it is below the front regulator pressure.
Here are default 2nd regulator settings. Happy shooting!
P.S. if you need to know how to properly adjust your M3, here is a 5 minute tuning guide:
I tried your 18 grainer tune and it worked great getting 890 fps spot on. When I do the same for the 25.39 grainers i get 789 for speed. Any thoughts? One other thing I noticed is that the 25.4 grainers slide in easily but the 18.13 grainers are not as smooth chambering. I chambered a 18 grainer and then popped it out with a cleaning rod and noticed that there is a compression ring around the top of the pellet. Maybe there is some slop in the width of the pellets. Side tangent. Thanks for your time.
The first regulator should ALWAYS be set at 150 bar…that is across ALL CALIBERS from .177 to .357. Never shoot an M3 when it is below the front regulator pressure.
I realize this is an old thread but since it showed up on a new search I wanted to correct the quoted statement so other new M3 owners aren’t confused/concerned like I was after reading that; per the FX manual you should not shoot the M3 if the tank pressure is below what you have your second regulator set to:
“Output pressure (26) Do not use the gun if tank pressure is below set regulator pressure.”
26 on the manual schematic is the rear gauge, so you can feel free to shoot it down to 100 bar if your rear reg is set lower than that.
https://fxairguns.com/wp-content/uploads/2021/04/Manual-Impact-M3.pdf
