1500 yard plus gun

[Kingair001]

I would look at the classic 7mm rem mag with 180gr berger hybrids or 264win mag with 140g berger hybrids. Either will easily get out to 1500 yards with less powder, less recoil than a 338 edge or lm.

Both are an option but here the Long Range matches start at 2000+ yards
It all depends what you want to do
But building a rifle and noticing tomorrow that you run 500+ yards short . . .