@deewayne2003
I'm a firm believer in starting a youth with an appropriate calibre for continual use ase they grow into shooting.
If you are a handloader this is very easy.
Start with a 398 or 30-06 with reduced recoil loads. It's not hard to load a 130gn to the recoil level of a 243.
As they grow you can increase power and bullet weight to levels they are comfortable with and work up to full power loads.
To me this makes more senses than continuing to change rifles and cartridge.
My son started at youth shooting camps at 12 and fell in love with the 308. I bought him a Howa 1500 and 2 years later he had a very successful hunt in Namibia with his 08 taking eight head of game including zebra and oryx.
Bob