Re: 300 Savage 165 Grain Bullets
If the bullet in question is the Sierra 165 gr. GameKing BTHP it should be perfectly fine to hunt with,thats what Sierra designed it for,it has a much larger HP than the heavier MatchKing,probably not something I would use on large game though.
The salesman probably has the Sierra MatchKing 168 gr. BTHP in mind,it's a match grade bullet and not really designed to expand so it's a poor choice for a hunting bullet and the Military does use it but to my knowledge it's not illegal to hunt with it at least in my state it's not.
What is illegal in many states is the use of a FMJ bullets to hunt big game but neither of the MatchKing or GameKing HP bullets are a FMJ.
Personally I like a nice SP bullet for big game hunting I don't have any game much larger than 200 lbs. around here so I use 150 gr. Sierra Prohunters or Hornady SST's in my 300 Sav.