I just got a Gamo Big Cat 1250. I was trying to sight it in yesterday at approx. 30 yards and was shooting 5" low. I raised the elevation 6 clicks 1 1/2" @ 100 yards because I was closer to the target and not sure how much it would elevate. Turned out to be about 2". I then increased another 6 clicks and grouped at about the same as the first adjustment and repeated another 6 clicks and still grouped at same level. I am assuming this is because I am at the gun's max range. I am correct? I was shooting the Gamo Platinum pellets that came with the gun.