First thing I would consider is availability of components
Selection of dies...IE..Forster or Redding
How far you gonna shoot...sounds like a no carry very far gun
Barrel builder...? Or off the shelf from Jim Briggs or Gun Shack
You have a long action....6.5x284 or just the straight 284 Win
Use Lapua 6.5x284 brass...neck up to 7mm....or use as is 6.5
Twist ? 7mm/ 9 twist for 180s..6.5mm use 8 twist for 140s
Stuck on the 6.5mm....don't overlook the 6.5x55...OR
280 Ack Imp for another 7mm...
Last edited by tikkanut; 11/21/14.