a .243 is a nice flat shooting gun. but if you sight in at 100 yards it has already peaked at 85 yards and will be dead on at 100. after that it is all downhill. it will be somewhere around 2 1/2 and 3 inches low at 200. sight it in about an inch high at 100 and it will be about a inch or 1 1/2 low at 200. this way you can aim dead on all the way out to 200. and this is with a 75 grain boattail. like i have said before if your gun is sighted at 2 or 3 hundred yards the bullet has not peaked yet at 100 yards. but zeroed at 100 yards the angle of your barrel is to low for the bullet to gain anymore..