It' s true that pre-64 M 70' s can often command high prices, but not if they are in poor condition. Your rifle can be rebarelled to ANY cartridge with a ' 06 size case head, but it can also be rebored to any cartridge based on the .30/' 06 case that has a bore diameter of .338" or larger, just by reboring the barrel, rerifling it, and having the chamber altered for the larger case. Rebored barrels are very often more accurate after reboring than they were when new in their origninal caliber.