Re: elk/mule deer loads for 243???
My dad has shot several elk ~5(?) with his .243 and they have all been with 100gr Remington CoreLokts, and the distances have all been under 200yds. There are better cartridges out there for this task, but the .243 will definitely do the trick on a cow elk if the shots are behind the shoulder and the distances are reasonable. You can up the percentage of penetration with the 100gr Nosler Partition or something in the Barnes lineup, and that combo should be a little more forgiving if the shots touch any sizable bone. Tell her congratulations and good luck!
God Bless and Shoot Straight