RE: 270-08?
This rifle would be expensive enough with out reboring and recutting the rifleing in a barrel. Besides that you would still need to have a reamer for it as the throat, at a minimum, would still need to be cut and to cut it with a 270 reamer would likley cut it out of center due to the fact that the front of the reamer is signifigantly smaller than it would be on a short case. It would be completely unsupported except for the pilot inside the bore. Way to easy to tilt the reamer off parallel with the bore and possibly snap off the pilot.
A reamer should be less than $200 to purchase. I know you can rent a 270-08 Ackley for only $33.00 from Elk Ridge. Not sure what Clymer would charge to rent one. I'm sure they already would have one ground though as this is not a rare a wildcat.