FX Panthera 700mm .25 FAC low power

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