Thanks for the offer Dan, but I've got a tried and tested Bushnell legend to try that with. I've done some more testing over 25yd at home and results look encouraging. It may just have needed more useage than it normally gets to loosen it up. Tried some different pellets and POI is exactly the same, so I reckon I can rule pellets out. I've also remounted the scope further forward by about an inch to try to get better eye relief. I've found one thing out though.......I shoot more accurately at 12 mag than 22 and upwards.