They are a little overkill in my book. And the 6.8 has a way better trajectory and further range. 6.8 is also the easiest to find and is a whole lot cheaper. The .450 bushmaster is a great round though. Just not what I'd recommend if he ever wanted to shoot a lot. 6.8 mags still hold 25 rounds also, so you don't loose much capacity for a gain on firepower.What about the .450 Bushy or the .458 Socom?
Love my 6.8. Outstanding for hogs.6.8 spc is the best for that.