Ahh...you want a RIFLE! Great choice, if available.
The truth is you can drill someone in the heart with a 44 Magnum, and the blood in the brain will still allow him to shoot back for 5-20 seconds - longer if the heart isnt totally destroyed.
Rifles have 4 times the power or more of a handgun, and might provide some knockdown power. However, a lot of deer hunters have discovered you can shoot a deer in the chest with a perfect shot, and still have the sucker run 100+ yards.
What he wants is one of these:
All those Mosin’s and not one Model 39? What’s up with that?
If I’m right to think those are Moisin-Nagents, I certainly wouldn’t turn one down. Had one about 30 years ago, and wish I still did. Ammo was harder to get then, IIRC, so I switched to a ‘98 Mauser in 8mm, and then later to a 1903-A3 4-groove. Wish I still had those, as well.
I think the best way to describe what I really want is “one each of everthing.” ;)