I started my son off at the age of 8 with a .223 because of recoil and he used it for 3 years until I bought him a .243. He shot 4 deer with the .223 and none went more than 75 yds. I would certainly recommend the .243 over the .223 because of the better chances for a good bloodtrail but I would still start off a very young hunter with the .223 which they will enjoy shooting more and have more accuracy because of the lighter recoil. If they put the bullet where it needs to be the .223 will be fine!