So, I've been testing my BSA 240 Magnum. Having changed the breech seal, cleaned the barrel & switched changed to RWS Hobby pellets it now holds zero at 8 yards. In fact I will increase the range a bit for the next session. I don't think the pellets on mine are clipping as others have experienced. It's actually quite rewarding to shoot. I plan to do some comparison testing with my .177 Webley Tempest & HW45.