The fixer, in the old days, before the Internet, smiths made reamers, after cutting the chamber they recut the the reamer, then cut the full length size die, a few cut a chamber die, not like the chamber dies cut today.
I do not want to get into the ‘best way’, there are three questions about dies as in off the shelf or custom dies including one that ask about making a body die out of a 308 W full length sizer die, I am not the fan of body and bushing dies, my opinion, body dies are the beginning of a bad habit that creates work and more question about removing ‘Do-nuts’. I have no interest in modifying dies, but if I was, I have a cut off saw, cutting the neck portion of the die off just above the neck/shoulder juncture would be my first choice, after cutting the die down it would make it easy to open up a small portion of the neck to avoid sizing the neck and allow for sizing the body and shoulder.
Options, it is possible to use a 30/06 full length sizer die to size the body of the 270 Winchester, the 270 W die to size the body of the 6.5/06, 6mm/06 or 25/06 etc.. Problem, donuts.
Same for the parent case 308 W, the body/shoulder dimensions are the same.
Not easy to find is the .33 (8mm)/08 sizer die, the .33/08 could be used to body size 308 W, again, cutting the neck off of a 308 W above the shoulder/neck juncture could be an option.
And I have an in-line, angle, butt grinder, shorting a die from either end with precision and with a coolant is always an option. I do not find it necessary because of other options.
One question was asked about the purchase of a chamber reamer and a die reamer, not that it concerns me but if the chamber and die was/is to be cut seems both would be cut and finished at the same time, and that goes back to chamber gages, chamber gages, today are a take off on L.E. Wilson case gages, and they will tell you their gage is not a chamber gage.
Back to the old days and smiths making their own reamers, a few made dies unlike anything used to day, I was ask if I had any interest in finishing some old projects, and the answer was no, some of the smiths were geniuses.
F. Guffey