Cornfedkiller,
Read this link below. I think you will be shocked seeing 300 and 400 grain bullets with less drop than 250 grain bullets at 200 yards with the same powder charge out of the same gun. These heavy bullets also have a much lower muzzle velocity.
It is kind of like what can you throw further, a whiffle ball or a baseball? A whiffle ball weighs a lot less, you are using the same power with your arm therefore you must be able to throw it further than a baseball correct?
Of course you cannot. Its too light, wind drags it down and it loses steam. In bullet terms it would have a much lower ballistic coefficient than a baseball.
Here is the article.
http://www.namlhunt.com/mltrajectory.html