Re: .17 HMR Rifles
Get him the BSA sweet .17 scope, I have it on my heavy barrel marlin and out to .300 with no wind that scope is dead nuts.....emphasis on NO wind! You get a little bit of wind, good luck over 100 cause that little .17gr bullet floats like a leaf!
I shoot hornady 17gr. bullets and in my experience for MY gun, as well as my buddy and future father in law, it is by far the best bullet in terms of accuracy and terminal performance.
For squirels its overkill by far, shoot them in the head and your going to find a headless squirel...shoot them in the body and your finding 2 pieces of squirel quite often....regardless where you hit them you can count on over 50% of whats left to be blood shot! You would be surprised what that little .17gr hornady grenade will do inside of a fox, groundhog, turkey, or other smaller sized game....I have yet to put one behind the shoulder on a yote, wouldnt hesitate to put on there at 75yds and in, but I know at 100 if you put one in the neck/head that flea bag is going down right there! People who doubt the .17 have likely never shot an animal with one, I was skeptical until I shot my first squirel then recovered it headless....if its strong enough to blow a squirels head off at 100yds and in, for me its got enough to drop a yote with a well placed heart shot within that same distance!