I have a 6.5 280 AI I get 3100 f/s with 26 " bbl. 143 Gn ELDX.Wanting to build a 6.5-06 but the question is to A.I. it or Gibbs it or leave it like it is? I would like to get 2900 to 3000 fps with a 140 grain bullet. I am not sure I can get this with a regular 6.5-06. The barrel is a Hart 27 inch SS, sendero contour, fluted and threaded for a brake or ? I do not want to go with a build on a short mag case, cause I am using a std. long action Rem. 700. I am 75 yrs young and have been reloading since I was in my late teens. I need something a little more than the 6.5 creedmoore. I have a .264 win mag just want something in between. Thanks in advance for your time.