Hatsan BT65 shot string, Want to tune it

[Runefalk]

I've been reading on  web some where that my 17 joule version has a different valv pin and I been looking for  hours too try to find a full power valve Pin but I can't find it?

Would it helps if I had bought a new tank that includes the valv???

[OleTomCat]

Once again if you are in a location that restricts the power of your rifle you may not be able to get the full power valve delivered to you.

I've been reading on  web some where that my 17 joule version has a different valv pin and I been looking for  hours too try to find a full power valve Pin but I can't find it?

Would it helps if I had bought a new tank that includes the valv???

[Dan H]

Once again if you are in a location that restricts the power of your rifle you may not be able to get the full power valve delivered to you.

I've been reading on  web some where that my 17 joule version has a different valv pin and I been looking for  hours too try to find a full power valve Pin but I can't find it?

Would it helps if I had bought a new tank that includes the valv???

That restriction has to be it , In the usa that gun has a ton of power .

[Runefalk]

The transfer ports are probably very small as you have a reduced power gun for your countries requirements.

Modifying it for more power may put you in trouble with your local law enforcement.

hi and thanks for your reply. I live in Norway and there are no restrictions on airguns related to fpe or velocity in any caliber, the only thing that are restricted is that you need a license for anything over 4.5mm, so we are lucky when it comes to that it's no power limits.

[Runefalk]

I forgot to tell that I bought this gun used and i think it must have been imported from maybe Sweden because they have very much strict laws then we have her inn Norway.I think the laws in Sweden is that no Airguns can shoot no more than 200m/s so if it shoots over 200 m/s you will need to get a license

[Popeye99]

I forgot to tell that I bought this gun used and i think it must have been imported from maybe Sweden because they have very much strict laws then we have her inn Norway.I think the laws in Sweden is that no Airguns can shoot no more than 200m/s so if it shoots over 200 m/s you will need to get a license

It's even worse ...
Max 10J / 7.4 ft-lb after 1992, pre '92 it was a maximum 199 m/s regardless of caliber. .177/4.5mm will do ~199m/s @ 10J

[moorepower]

I've been reading on  web some where that my 17 joule version has a different valv pin and I been looking for  hours too try to find a full power valve Pin but I can't find it?

Would it helps if I had bought a new tank that includes the valv???

Pretty sure the valve pin is larger like on the AT44 low powered valve.

[Corny]

There is roughly .1” difference in diameter in the valve poppet.
Between the at44 and the bt65

[Reidy]

I'm so glad I found this, and the many other threads on here, concerning the BT65. I have just purchased one recently and have been playing with it.  I thought I was happy with the 16 or so usable shots at 36'ish ft/lbs using JSB jumbo 18.3's with a Huma regulator set at about 147bar. Then I saw the string above where they're getting 20+ usable shots unregulated.

It looks like I still have some setting up to do!