FX Panthera 700mm .25 FAC low power

[Kevgun]

Hi Guys, I have a Panthera 700mm .25 FAC , it is under powered, using 34gr H&N slugs Reg pressure set @ 130 bar, and the power wheel on 23 with quick tune on 4 I am only getting 750fps, the Brother of my friend has the Identical rifle and with the same setting it is doing 1020fps.
I have checked the breech seal etc, but that is fine, the other thing is when adjusting the power wheel from minimum to maximum there is only about 30 fps difference, Any ideas of what to check next?

TIA

Kevgun

 

[Laeljon]

Need to go through process of tuning. Adjust Macro wheel down till power starts to drop off. then start turning Micro wheel down till power gets to where U need. Just because freinds Micro wheel is at 4 does not mean yours will be the same.

 

[Kevgun]

Need to go through process of tuning. Adjust Macro wheel down till power starts to drop off. then start turning Micro wheel down till power gets to where U need. Just because freinds Micro wheel is at 4 does not mean yours will be the same.

Yes I understand that, but surely with everything maxed out on the hammer side, I should be getting more than 750 fps, As i said in my previous message, adjusting the power wheel make hardly any difference to the fps, whether with the power wheel or quick tune.

 

[MongooseV8]

Did you jump straight to max settings or did you tune it up in stages? A small fps change over the range of the hammer preload setting usually indicates either way too much hammer strike or too little. What was your reg setting out of the box?

 

[Kevgun]

I went up in stages, I got to max, it made about 30fps difference from setting 1 to setting 23, I then tried increasing the quicktune and this made about another 25fps It's running at 750 FPS max
I have the M3 Impact in the same barrel and calibre and i can easily get it to 1000fps

It's almost like it's restricted somewhere

 

[Headshots]

You could have a pellet or lead stuck in one of the dual ports . That happened to me and really threw things off . Is it new or a second hand airgun ?

 

[Kevgun]

Its recently new, I'll remove the barrel to take a look

 

[Kevgun]

Did you jump straight to max settings or did you tune it up in stages? A small fps change over the range of the hammer preload setting usually indicates either way too much hammer strike or too little. What was your reg setting out of the box?

the reg setting out of the Box was 120 bar

 

[Macros]

Check the valve seat. It can rotate and choke off the transfer port. My friend's panthera had this happen spontaneously for some reason.