What twist of barrel and what is more cost effective a stiller predator action or a blueprinted 700?
Most cost effective is a Montana or a Nosler. Both can be had for the cost of a Stiller or blueprinted 700 action, and both are good rifles and ready to go.
But then so is a 7-08 Montana for most things I can think of doing.
The 280 AI doesn't really do any more than the 30-06, but it does it with greater efficiency.
The 30-06 will wake up when loaded up to full power behind a Scenar or 208 Amax.
These days hard decisions mostly revolve around glass.