Hw35 barrel problems

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Check all screws for proper adjustment, you have ruled out possibility of scope cause

chronogragh, if possible, to check health of rifle.

how is breech seal any blow by, do tissue test. Perhaps seal a little proud. Reason I mention proud breech seal is I myself receiving a fwb with such a seal causing same effect you are describing. 

have you been inside to check main spring and piston seal, main reason for chronograph, checking for consistency / fps.

I'm sure in time enough people will respond with possible causes and you can check off cause and effect and find a solution. If nothing else you can bend the barrel to bring POI to POA, providing you have consistency.

Cheers
 
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Scopes don't like to be at the end of there adjustment, they need to be as close to optically centered to hold zero. I used a BKL-288 Adjustable Scope Mount on my HW35 to adjust for the droop, there is more than enuf adjustment in this mount to get the job done. After that I would see how it works before changing the barrel. You might want to check the barrel pivot bolt adjustment.

http://www.bkltech.com/BKL-1-Adjustable-Mount-p/bkl-288.htm
 
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"Bigdog12"Its about 4 months old 
i also installed a vortek kit in it shortly after i got it,so i dont know if that voids a warranty
it has never shot very good groups about 1 1/2 at 19yds
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Ouch! What caliber is it and what pellets are you shooting? Are the groups stringing vertically or all over the place? If you suspect the scope,you might try it with the iron sights. HW barrels are sometimes oversized in .22 caliber, have not heard any negatives on the .177.
X 2 on checking the stock screws and scope and mount-pencil marks will help you see if the scope is sliding.
Does your mount have a stop pin?
I think something is not right-an HW should shoot way better than what you're getting.
 
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More thoughts on my problem,i did some testing first it is a 22cal
i am sure this is not a ring or scope problem also all screws are tight on the gun
rings have stop pins and i have used multiple scopes
i put a set of fx adjustable rings on had to tilt rear ring about 1/8 of inch to get it to shoot at poa
but groups are 1 1/2 horrible thats with 3 differant pellets
when the barrel is locked up you can grab the barrel and flex it pretty easy so i bet when its shooting 
its flexing like a limp noodle

 
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You seem to have checked off the usual conditions of poor accuracy, eg screws, rings etc. Because the gun is new and is likely still under warranty, even though you fitted the Vortec Kit ( Weihrauch normally provide a 12 month warranty) I recommend you that take the gun back to the dealer where you made the purchase and have them check it out for you. My experience is that dealers are mostly happy to assist, and even if you need to pay for the repair, that cost is likely to be less than buying new rings, scopes etc etc. Sorry I can’t be of more help.
 
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Have you tried different rings (than the FX)? I have no personal experience with them but read that some people shy away from them on springers. Dumb question, you are using .22 ammo, right? Have you tried a couple of different ones? Is the flex at the breech? I have not used a HW35, but I believe it has a breech locking mechanism. Do you have to do anything to lock the gun, or do you only need to unlock it to break the barrel open? When you replaced the piston, did you remove the barrel? There are a couple of spacers on my HW80 that is easy to lose.
 
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