the hunting laws here have a mentored hunt for those ages 10-16 ,so 2 of my kids are old enough to hunt. They are 12 yog and 11 yob.
I set them up with open sights on a 45 cal. at 50 yards. they are shooting 70 gr 777, fed primer, 40 cal. 200 gr SST bullet with tan sabot. There is very little recoil. and they don't have a problem at all with that load. I believe it will effectively kill a deer far beyond what they will be shooting.