I would like to develop a light load in .243 capable of effectively putting down whitetail. I am going to be loading these for my son (9 years old), and was thinking of using the lightest bullet that would still get the job done and with reduced powder charge so the recoil wouldn't be too much for him. It's a Rem model 700, and with the factory 100gr. bullets it does have a decent kick (for 9 year old standards). Any load recommendations on this topic would be greatly appreciated.