Zrexpilot,
You might want to check out some reloading catalogs. There are a few company's that make a 105gr. bullet in a .243. A few would be a Hornady 105 Gr. A-Max, A Speer 105 Gr. Hot-Cor SPT. Sierra also offers a couple Matchking's in a 107Gr.
I know they make 105 and 107 gr. bullets but I said no one loads them.
Those are only accesable to hanloaders. I dont know the ballistics on them but that 107 matchking has an awsome SD and BC. Would like to see that loaded hot and see what it would do.