I was looking a the dimensions of the .260 Rem and 6.5X47 Lapua. Seems like I could ream away the neck of the .260 chamber with a 6.5X47 Lapua chamber reamer, then just cut off a short section of the threaded breach of the barrel. Maybe I'd have to extend the barrel breach threads a bit further down the barrel for the barrel nut (easy). Hardest part for the home smith would seem to be cutting off the extra length of barrel. Does this idea seem practical?
.260 Rem; 6.5x47 Lapua
Bullet diameter .264 in (6.7 mm); SAME
Neck diameter .2969 in (7.54 mm); 7.41 mm (0.292 in) (SMALLER)
Shoulder diameter .4539 in (11.53 mm); SAME
Base diameter .4705 in (11.95 mm); SAME
Rim diameter .4728 in (12.01 mm) ; SAME
Rim thickness .0539 in (1.37 mm); SAME
Case length 51.7mm; 47 mm (SHORTER)
Specs above taken from Wiki.

Because the .260 neck is 7.54mm in length, this is the length that needs to be reamed out of the chamber. Also because the .260 case is 4.7mm LONGER than the 6.5 Lapua, we'd need to cut off 7.54mm plus 4.7mm = 12.24mm from the barrel's breach. That only about 1/2 an inch. Now, you have a dirt-cheap Savage 6.5 Lapua!

Alternatively, is it possible with the screw-in Savage head-space adjustement, to just screw the barrel in an extra 1/2 inch without needing to cut the barrel at all???

Thanks,
JohnEP.