I have built ~ 30 rifles for myself over the last 15 years, and the one 6.5-06 has been the best.
6.5-06 A square reamer
Shilen select match stainless #3 taper 5R 8" twist 24" finish
Boyds pro varmint stock
Timney trigger
Dumoulin Mauser action
homemade Aluminum round rear pillar
home made Aluminum flat front recoil lug/ bedding
Custom FL sizer body from Forster neck honing service by paying for double hone out fee from 25-06 body to 0.292" neck.
Custom collet neck die mandrel from Lee Custom Mandrel reduction service by paying triple fee for 270 mandrel from a collet neck die down to 0.262", but leave the top 1/4" alone to fit a 270 collar.
120 gr Nos Bal tip moly with 50.7 gr IMR-4166 powder 3.34" , Win 30-06 brass, Chronographs at 3197 fps
Averages 0.92" 5 shots at 100 yards first trip to range
Sighted in to 600 yards.
Killed a whitetail doe at 629 yards.
In 2017 I will build at least one more 6.5-06.
Probably with Rem 700 and or Savage 110 actions.