I think it is the best option for an LR rig without going to extreme lengths.
Lapua brass is readily available and unbeatable in quality, while an improved version in a 30+" barrel will surpass 3000fps with a 300 grain bullet, which with the offerings from Berger and Sierra make it a great choice.
If you want to go further or faster with bigger, you get into the Cheytac and other wildcat territory.