One thing to keep in mind when choosing your caliber is availability of components. For the near and maybe far future 168 A max is not available plus I would not build anything around just one bullet. Most any 6.5 caliber hunting style bullet will work great velocity wise for expansion on game from a 14+" barrel. The Nosler 120 BT. Sierra 120 SP, Hornady 129 SST or SP would really be deadly on deer out of a 260 Rem. One other plus for the 260 Rem is you can make the cases easy from 243 Win which is easy to find if you can't find 260 Rem.