If you don't mind using a 28" barrel a 6.5x284, 6.5 rem mag, or 6.5-06 will get you there without case forming, if you do not mind case forming the 6.5 Sherman or the 6.5-06AI just a short necked sherman will also do great. They only other magnum case I would consider is doing a 6.5x7mm rsaum imp, other than than that the 264 wm, wsm, wby, 6.5x300wby, 6.5 ultra cat 6.5x300wm and 6.71 lazz are all the grim reaper on barrels, some do not make it through load developement, besides if you use an 8.5" twist 140 bergers will be happiest at 3125-3150.