DO NOT rebore. Savage and Marlin barrels interchange and there are aftermarket barrels. All you need is a barrel vise, wrench and headspace gauge, all available from Brownells.
I have a Savage barrel on my XLC 270 that was a Savage 22-250 with a bad chamber. Now a 22-06 (55 gr @ 4000 fps). Barrel swaps take 20 minutes max. 22-06 shoots ok:
as does the 270:
IME The factory stock is fine with the following changes:
1. Pull off the recoil pad and glue it on
2. Free float the barrel from the action forward
3. Glass bed a 1/2" hardwood dowel in the foreend to stiffen it up.
4. Glass bed the action and, insofar as the recoil lug goes, insure ONLY the rear of the recoil lug is touching anything.
5. Torque the front action screw to 65 ft ins, the rear to 35.
6. Adjust the trigger as low as it will go (about 2.5 pounds)
After doing this my 270 XLC went from 2" groups to above:(5 shots freshly cleaned barrel)