There are so many fraud amm sites that have popped up over the last 2 yrs its insane, only use ammoseek.com to find ammo online, they really try hard to filter out the scumbags..cheers sorry about your troubles.
https://ammoseek.com/?utm_source=webapp
Well, if I may, try a 6.5 Grendel, I have a CZ 527-Lux/American, it has no felt recoil, super short bolt lift its called a mini Mauser action, should fit him great..Ithink the felt recoil is about the same as a 5.56.
I own both the .240 and .257 WM, they almost seem to have about the same felt recoil, like a .270 win sort of, as for your kids, best to start them off with a .243 win.
I shoot a very nice Rem M700 in .243 win, shoots great its the heavy barrel one, mbut there is no recoil at all, you could get him a med barrel, the older Winchester M70 are also great, if you dont mind paying a bit more for your hunting ammo, if you see a 6mm rem, they are just great on deer...
I used to hunt with a Ruger .44 Deerstalker in .44 mag in my boyhood days, my Dad just bought 240 grn soft points for me, took lots of deer and a black bear at 30 yards, the hunting ammo from Buffalo bore is great.
https://www.buffalobore.com/index.php?l=product_list&c=72
Hey dudes, im a former 1371 USMC, I have spent the last nearly 20 years working in support of OIF/OEF, uugghh. retired in Seattle, double uugghh, I don't even understand my state anymore, hope to move to MO or WY in the next few years, live for hunting, missed the last 2 seasons because of knee...