Hatsan Hatsan 95 under performing

I have a newer Hatsan 95 Springer in .22 and it's velocity is well below spec. I'm getting 659 - 680 fps with 14.3 HP. Hatsan lists it at 800 fps and others are reporting 780 - 830 fps with the same ammo. I let it go past the warranty period since I didn't have a chrony until recently. Any suggestions on what I can check to find out the problem? Thank you
 
Depends if which pellet I use. This 95 really seems to like the crosman 14.3 pellets. They fit well. Not lose. I have no intention of using slugs in this 95.
Slugging the barrel is a term. Not the ammo
It means you push a pellet from breach to choke. So then you know how the pellet truly fits. Too tight or too loose = loss of FPS
 
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Slugging the barrel is a term. Not the ammo
It means you push a pellet from breach to choke. So then you know how the pellet truly fits. Too tight or too loose = loss of FPS
I'll have to give it a try. Since it was this way new I was going to try the breech seal. Hatsan doesn't appear to have them in stock at the moment though.