FPS variation in an HW100

[seagate]

I recently bought a new hw100 22 , it produces over 100 shots between 560 and 570 fps with 16grn jsb. I'm happy with that.

[RichardinDorset]

Here the graph. It's a 2009 gun I bought second hand. Very little use and never been apart.

The barrel was shagged though...

It's now got a brand new barrel on now.

http://i1262.photobucket.com/albums/...ps9ekpckt9.jpg

[krisko]

Hi Richard, the hw100 regulator has a bit of "creep" at high cylinder fill the output will be higher, at low fill it will be lower. can be like 5%.
it is not like a Vulcan or Cricket regulator where you have a firm hard seat, but it is using the ball bearing lifted off the rubber seat by the regulator piston. The guns knock open valve will sort out/compensate for this variation. so it is not critical.

there is a video of a spanish guy on youtube who works the hw100, he polishes the hammer and the shuttle etc. if you have not had your action apart, worth trying. polishing helps.

with my Vulcan(recommended), when i R2 chrony it (recommended) i am getting MANY duplicate readings in fps, which is something.
I dont see this with hw100s.


you can try to use different measuring equipment thats why i am linking you this
https://www.youtube.com/watch?v=VsDoqHOFIEI
i got mine from forguns_pl off delivered with no issues and it is the best chrony in my opinion.

Edit:
single digit deviations will NOT move the POI. so dont dwell on this.