Oh, I really don't know. Probably a '03 so I can buy ammo off the shelf.
Back 40, you'll want to load your own 30-06 with cast bullets, or buy some loads from someone like Hoodoo Brown at CVV. It's much more user friendly to run at 1500 - 1800 fps than 2600 fps!
There is a good source of cast bullets (Norm Purcella among others) and recipes available for some proven loads. Try it, you'll like it!
For the 30-06, 150 gr cast bullet, 32.5 gr IMR 4064 = 1725 fps. It's amazingly accurate at these ranges out to 200 yds, maybe even further. Others have similar or maybe even more accurate loads.