FX Dynamic Express 700 .22 Speed Issues

[APOSTOLOS]

Hello,
Im making this post to write down something that concerns me about my 700 Dynamic Express in .22
I am trying to shoot the 40gr zans at about 900 or even 1000 fps. The gun arrived at 120 bar on the regulator and the micro on 2. It was shooting the 40 grains at 820 fps. I played a bit with the regulator, set it on 130 bar and the micro wheel on 2.5, managing 865 fps consistently. I tried to increase the power just a bit more and i just cant do it. For example, with 130 bar on the regulator, when i try to set the micro at 3, the fps will drop to 350. I tried higher pressure on the regulator, 135, 140, 145, 150, 155, 160 and 165. All those reg pressures cannot get more than 700 fps and the maximum i can get the micro wheel is close to 2. Example, 160 bar and the micro at 2, i get 730 fps. If i try to get the micro to 2.5, the speed instantly drops to 350-340 fps. If i set it back, i can get it back to 730. The issue is that it does not like my micro to be more than 2.5. Even at 130 bar, i should have been able to have my micro at 3.5-4, right? Anyone else experiencing something similar?

 

[darknes]

you need a new hammer weight 13.2 grams if you want to shoot such heavy slugs and try them in caliber .217 because the new slug liner 1:16 has Chok

 

[Ctkny]

155, 3.5-4.....218 might be too tight in ur liner

 

[Airgunmann]

You need to up your regulator the longer the valve is going out the barrel after the pellet left so a higher pressure burst will accelerate it better before running out of barrel hopefully it makes sense to you but I would up the pressure and crank up the hammer spring pretty sure you won't need a heavier hammer

 

[Kgphotos]

Where is your “macro” wheel set?
I just began tuning my Panthera .22 600mm with 34 grain H&N. I set my Macro to 13 and the micro to 3.25 and then started the reg at 125 and started moving the reg up 5 BAR at a time while shooting over the chrony. Once I got to 140 BAR I was in the 930 fps range with 34 grain slugs. If your macro wheel is maxed out already re-try your experimenting with it set to 13.
Kenny

 

[weevil]

Where is your “macro” wheel set?
I just began tuning my Panthera .22 600mm with 34 grain H&N. I set my Macro to 13 and the micro to 3.25 and then started the reg at 125 and started moving the reg up 5 BAR at a time while shooting over the chrony. Once I got to 140 BAR I was in the 930 fps range with 34 grain slugs. If your macro wheel is maxed out already re-try your experimenting with it set to 13.
Kenny

I really wish that FX would clearly explain how the micro and macro wheels interact in their manuals. It’s a major source of confusion for inexperienced owners.

 

[APOSTOLOS]

You need to up your regulator the longer the valve is going out the barrel after the pellet left so a higher pressure burst will accelerate it better before running out of barrel hopefully it makes sense to you but I would up the pressure and crank up the hammer spring pretty sure you won't need a heavier hammer

Tried all reg pressures up to 160 bar, the micro does not like to get past 2. For example 160 bar and the micro at 1,5 with 730 fps, the moment i set it to 1,7 i get 350 fps.

 

[weevil]

It sounds like there is a problem with the hammer system or more likely the valve. Valve pin damage has occurred on some of these guns and you can find some info on those and maybe disassemble and inspect. However, I would recommend contacting FX support before tearing into it.

 

[Airgunmann]

There were some that the hole for the valve stem wasn't deep enough and it was limiting and bending valve stems