Hi guys, I could do with some help. My brother in law has had his Stealth for about 5/6 weeks and has had it filled twice and on both occasions when he has come to use it's shooting on average 2-3 inches higher and he has to reset his zero again. As far as he is aware it's not being overfilled and the scopes not getting knocked as it's in a hard case. What do you guys think could be causing this.
Thanks
Nige