Hey Gregor, have you tried these pellets http://www.krale-schietsport.nl/en/munitie/munitie-luchtwapens/airgun-pellets-eun-jin-samyang-5-5-mm-32-grain.html and http://www.krale-schietsport.nl/en/munitie/munitie-luchtwapens/airgun-pellets-eun-jin-samyang-bolkop-5-5-mm-28-4-grain.html