I'm kind of a newbie at long range shooting but I do know a thing or two about it. My current rifle of choice is a Winchester Model 70 Stealth in .308 with a Leupold Mark 4 6.5-20x50mm LR/T M1. Here is my issue. I was out sighting it in for long range shots the past 2 days. at 100 yards I'm hitting <1 MOA consistently. I have the JBM ballistics calculator on my phone and while I understand this is not necessarily dead on every time, it should at least get me on paper at 400 yards. Anyways, I set up a target reading about 440 yards on my Leica range finder. I plug in the info in JBM including all my bullet info. Right now I'm shooting HSM 168gr VLD's. I have made sure all the inputs in the calculator are correct. However, when I shoot the bullet is hitting like 4 feet hight. So I set it to my zero mark. Bullet it still high. I am prone the whole time and 100% sure im not jerking it. I drop down 7 MOA the opposite way and finally hit it. I sighted it in at 100 two days ago. Have not dropped the gun, messed with the sights or anything. Am i doing something wrong?