Thanks for that stillair1.it is the 17 shot mag.the fliers occure at anny point of the zeroing.kev g gave me some tips and the groups did get better.i thought i had craked it but i am still getting the odd one 3/4inch flyer.i think there may be some lead been scraped off the pellet either as it leaves the mag into the breech or as it enters the breech ie from the porting.some pics will be great if you can on how to adjust the mag.getting sik of stripping the gun down to no avail.to me an inacurate gun is as good as a chocolate fireguard.ATB JEZ