Yesterday i tried to do some quick yet extensive shooting at ranges from 100-450 yards just to begin to test this ballistics program i used and i was spot on at 100 with a 1/2" group so we know the rifle can do it. But then i backed up to 200 and which i was almost 1-1/2" low. So i checked the program and it said i shouldn't have been. I backed up too 300 and i wasn't even on paper any more and i couldn't figure out what the hell was going on!. I backed it out too 450 and 1 bullet it the bottom right out of 3. So i moved it back into 200 same thing happened. I moved it out too 300 and added 1 1/2 moa and i was on paper this time and then too 450 and added a few moa and this time i was decent. I would like some help with a ballistics program you guys are using? Im using 243. win, 80 grain factory loads with BC of 0.365 fired at 3330 FPS. Im trying to practice out too 600 yards but if i cant get too 300 i dont know what to do.