Hatsan Hatsan factory sniper L not reaching claimed fpe

I had a Factor RC in .22, it was not very powerful either. It shot well, but did not make the power claimed.

I do not know of ANY Airgun Manufacturer that does not inflate fps, fpe or anything else. Their measurements are taken indoors, in a vacuum. It is kind of like all the worthless adverts on TV for anything that ails you. Try and challenge them and they will show you their results and tell you that you did not read the fine print.

CharlieF said:

I do not know of ANY Airgun Manufacturer that does not inflate fps, fpe or anything else. Their measurements are taken indoors, in a vacuum. It is kind of like all the worthless adverts on TV for anything that ails you. Try and challenge them and they will show you their results and tell you that you did not read the fine print.

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I can see that being the case of just about any airgun company, but I have to agree eith the OP. Every Hatsan I have had has always met or exceeded their power levels.

Jarkko said:

Hatsan has a reputation of reaching or exceeding their claimed energy numbers. I had numerous hatsans and same case with every one.

This factor sniper L should put out 115fpe in 25. I’m getting only 85fpe and i have tried many different pellets.

Reg pressure about 150 bar and hammer adjustment maybe 70% of max seems to give best power.

Do i have a faulty gun or has anyone else got the claimed fpe out of their gun?

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Is your reg maxed at 150b? If not you likely have to increase it or try a heavier projectile.

So in .25 caliber, you certainly can't do the performance the manufacturer claims with pellets. You have to use slugs at least 55 grain. Set the regulator to 200 Bar and you'll have a higher power output right away and especially you can use the hammer to fine tune the speed of course to get the power indicated by the manufacturer you'd have to get to a speed of about 315 m/s at a weight of say 50 grain

Heavier slug with more hammer
Pellets can only go so far.

Years ago I bought a .177 cal springer that claimed 1800 fps.
I'll leave it at that.

I had a hatsan sniper l in .25 caliber and the regulator went up to 250 bar just fine. If it's not working, there's a defect somewhere. If you want to shoot jsb 33.95 grain and want high power you would have to have a very high velocity. That's not going to solve anything. You'd have to go to slugs and more weight to get higher power. If you don't want to accept that, it's complicated.

I personally had a regulator full of vaseline so I took it apart completely cleaned it and just used silicone oil and then it worked fine. Unfortunately I don't have any photos. I had the airbox completely at the beginning when it was made. Now it's gone and I've switched to FX Panthera and Dynamic in .25 caliber and I'm completely satisfied.

Reviving this. in essence as a shoutout to Jarkko.
I did get me a SL and as all other pcp´s of course took it apart completely.

Albeit i´ve got some rather serious critique on the unit for Hatsan the power claimed though is there with an absolute minimum of modifications.

There´s a few of us that run this rifle that compare notes that keep heavy machinery AND the know-how needed why the following is to be said.

It´s basically held back at two points. The valve/poppet setup and the entry port on the barrel.
The latter is simple enough to port out to more in reason dimensions with the rest of the transfer circuit. Just go at it i say but keep absolute diameter in mind.

The valve is a bit more involved and takes a bit of machining to get right.

Be that as it may there´s those of us that have seen beyond 200 Joules for the 25 @ very elevated reg pressures but be that as it may with a tad of porting and a reworked valve assy the thing lingers along calmly at 135bars handing an easy 130 Joules.
So yes.
The SL can no doubt be had to deliver, that much is for sure.

On a completely different note it became sorts of a pet peeve to me the length of this unit. With one of my own 220mm long cans out front to keep it silent in operation it turned just silly.
Well.
There´s a remedy for that carrying the thing around, as i looked through the parts list for FX stuff.... the foldable stock hinge for their Dreamline and what not. Not overly expensive seeing what it is either.





More or less direct fit install, and does it ever make for a difference. IMO this is how this insanely long gun should be delivered from Hatsan.
Anyway.
I´ll make a separate post on my findings as far as the gun shortly.