I have got a 6x24x50 viper pst on a .300 win mag 700 Police with a badger break on it and It is ACCURATE. I normally atleast cloverleaf at 100 yards if not one hole it but lately I noticed my groups were getting worse and worse. I shoot the same bullet with the same oal and the same powder ect... Anyways I checked the torque on the base screws ect... Everything was tight and right. shot again same damn thing. 3 to 4" groups. Then I thought about it and put my Mark 4 on it and bore sighted it and presto! My old gun was back to shooting one hole groups. Has anyone had this happen with a Vortex??? It's not been officially verified by Vortex but I knwo that the reticle is moving. Funny thing is I have a muzzle break on it and it kicks less than my GAP .308 So why in the hell would it be doing that?