hello i had the same problem with my vectra diesel, just wound over and over. ended up changing the injecter leak off pipes and plastic connecters was told this is common fault worked a treat. not to bad to do either
i use a cz heavy 16 barrel with a sak moderater, together wit 3-9x50 dowling and rowe scope, great out to 120 yards, but then would benifit from more magnification, may change scope in near future
went out after tea to try and get a couple of rabbits on some rough ground, ended up with 9, 6 for the table the other 3 for ferrets as the hmr knocked them about to much ,