Shoulder location on the 6.5x47 Lapua is shorter than any of the .308-based cases, so the way it articulates with the magazine and feed ramps won't be the same.
One source of brass, which is costly. Great bolt gun cartridge.
I went .260 Remington for my gassers. Way more choices and sources for brass, case dimensions are the same as a .308 for feeding purposes, same shoulder location, same shoulder angle.