Back in the day, light bullets in a caliber were intended for varmints and predators while heavier bullets were for medium/big game. That is no longer completely true. The solid copper bullets come in lighter weights. I know a few guys that use 80 grain Barnes bullets in the .243, but I don't feel the need to buy premium bullets for deer. If I were limited to only one deer bullet for .243, it would be a Hornady 100 grain soft point, which Hornady loads in their American Whitetail ammo.