Hatsan Gladius pellet fussy or what.

[kneeknocking]

Hi, i have a Hatsan Gladius bullpup which i got second hand of a good friend just over a year ago in .177. My problem is i have tried 30 differant pellets throught it and the best i could find was webley accupals giving me a10shot 18mm group at 25yrds. Yeh i know some would say whats wrong with that? Nothing but after i have shot 5 tins, its now shooting the new batch the size of a tea plate. So i gave jsb pellets a second chance with results 15mm at 25yrds when i tried them first i was lucky to hit a dustbin lid at 15yrds. Can anyone explain this to me or has anyone had the same problems with their hatsan,s

 

[dodge3500]

Mine loved crosman premier hollow points in .177 and the domed as well but you may just need to clean the barrel to get your accuracy back or you may even want to crono to check your fps to see if it's shooting to hot.
thanks hope it helps.