Is there any where on the internet where a person can compare various loads made by different manufactures?

Not sure of the internet, but if you look in the back of a GUN DIGEST you will see ballistics for almost every caliber available from .22-.700 H&H. These seem to be data from various manufacturers, so keep that in mind.

Dont know about on the net but Bob Forker's book Ammo and Ballistics gives velocity, energy, trajectory, wind drift, Taylor KO values and ballistic coefficient for most if not all factory loads. It's a 25 dollar or so book from Safari Press (Midway may be a bit cheaper)