To put in my two cents, I've taken 27 deer with a .270 and watched all but 1 fall. Leads me to believe it is very effective, yes I know Jack O'connor would be proud. Yes it does kick, last year during our does only season I took a couple of does with Rem's new managed recoil loads. One was just shy of 150 yrds. Ballistically on par with a 300 Savage and the recoil of a 30-30, they do shoot about 2" lower at a 100 yards than reg 130 grain factory loads, but still in line. At least in my Rem. pump. This may be an option. If you do have him use full trottle loads cover his ears and layer him real good, so he doesn't get beat up too badly. When he's shooting at a deer he won't know the difference in recoil from a .22 or a .375 H&H. Hope this helps. I know about recoil woes this is deer only deer rifle I've ever used or needed for the past 25yrs now and it does quite well on Colorado's elk also.
John