Hatsan Hatsan Flashpup accuracy problem

Hello

I have a problem with accuracy on my Hatsan Flashpup.22 , on about ten pellets I have 2 or 3 flyers of about 6 cm to the left, the right up and down, I changed my scope try with and without moderator , trying several types of pellets for the moment the h&n ftt are going well very good grouping despite the flyers, I have properly recrowned the barrel. All test at 10 and 20 meters.

I suspect the barrel…

What do you think?
 
Something I do when all else fails, is to load a pellet as I normally would, leave it in the barrel and pull the barrel, look through the transfer port and check if the pellet is visible through the TP. If it is, the burst of air deforms the pellet skirt, and leads to poor accuracy and consistency. This has happened to me a few times, and you can usually hear it while the pellet is in flight.