Guys, if we all stuck with standard cartridges then we wouldn't have the 7mm-08, .243, .270 win, 338-06, 35 Whelen so on and so on.
If you can have a 30-06 then why do we need the .308?
I've often wondered why this is not a standard cartridge. Seems it would be a natyral bases on the .308 case just like it was with the 30-06 case. It's the only one missing.
The only downsides that would cause a person not to build one is the huge cost involved and time required to do it.
IMO chambering the rifle would be easy if you stick with the 270 porfile , just use a 270 reamer and not insert it all the way ( about 1/2").
You couldn't use a standard .270 reamer because you would be cutting off the wrong end of the chamber. You need the back of the reamer rather than the front of the reamer. The .308 and 30-06 cases are identical except for the length.
For the dies you could take a standard set of 270 dies and machine off the right amount off the bottom of the die.
You run into the same problem again.