RE: 243. For Whitetails
I used a Parker-Hale .243 with a redfield 3x9 for my first few deer when I was younger that was the best Whitetail rifle I ever used. It shot very flat up to 250 yards maybe even further but that is all the distance I ever shot. I highly recommend a .243 especialy for a younger hunter or someone that flinches from recoil. Had plenty of killing power.
It is not good to have zeal without knowledge, nor to be hasty and miss the way