Yes it could be done, but not as easily as it could with a different starting platform. You would have to get PTG to make you a .473 bolt head with .550" lugs and 1.125" shank. The mag that comes with the 110 FCP in 338 will not work with the 260, but thats an easy fix, just buy a 300WM mag from Accurate Mag and tweak the feed lips. You would also need a large shank barrel as the Lapua is a large shank action. That's really about it, that and some go no-go gauges.