Answer:
This should not pose to much of a problem as long as you have the caliber of the bullet,the muzzle velocity, and the BC (ballistic coeffiecent).If you are shooting factory ammo all this info and bullet drop tables can be found on the back of the ammo box in some cases.If this is not listed then you will need to shoot your ammo over a bullet chronograph and find out the muzzle velocity of the bullet in feet per second (FPS).This will determine the amount of hold over at 100yrds so the bullet will impact at point of aim at 200yrds.If you are willing to give me the cartridge you are shooting and bullet weight,I have the bullet tables to tell you how high to place the bullet at 100yrds so you have a dead on impact at 200yrds.