Get the 257...you may not have 50 different factory loads to choose from but you only need one. If I remember correctly, either Federal or Remingtonsellsa +P loading for the 257. When it comes to lightweight rounds, Ilike the fact that you can shoot a bullet that is 20% heavier with a slightly larger cross section. Currently Iprefer a 7mm-08 to either a Bob or 243but that is a whole different topic