I have a new Armasight Zeus 640 3 x 24 x 75 and when I sighted it in by shooting and then moving the cross hairs to the hole, I then took another shot and did some follow up adjustment till I was hitting the mark. My problem is when I do a three shot test my shots are climbing, what could be the problem. The scope is mounted correctly and is tight, when I do a cold barrel one shot I am hitting the bulls eye. I am shooting off of a lead sled which is bolted down to my shooting bench, I also have a 2 pound trigger,and am shooting a DiamondBack A10 chambered in 308 with an 18" fluted Stainless Steel Barrel. Any insight would be helpful, it does it more then once.