Hornady 55 grain cannelure sp product number 2266, Speers 55 grain gold dot, Hornady 60 grain sp (may not stabilize but does in mine), Winchester's 64 power point, Sierra 63 smp, 55 grain gameking sp or hp and if you like lead free the options continue. Speers 55 gold dot would be my first choice but I have and will continue to use any of the above. I just keep shots closer than I might with a TMK or ELD.
The trick is to stick to shooting them in the parts that are vital for life. How long do you have to wait for your son to begin hunting? It's pretty affordable to get a faster twist barrel spun on a 700.