I shot an elk with mine this year. 100 gr Win PP. I posted the story and got alot of differing opinions about the ethics of useing the .243 on elk.
Even though it killed the elk, I most likely won't be using it on elk again. With that said, the .243 is about the perfect gun for deer! Don't hesitate to use it and enjoy it on your deer hunts. It has taken many a big buck in its' history!