Well, it is exactly what I'm planning to do. I'd get the rifle in .338, with a decent scope (probably a Vortex Viper PST Gen 2, FFP)...
If you are looking into shooting PRS 338 Lapua wouldn't be a great way to go, but it's still a great platform.
Any recommendation? I'm using a 308 for 100v shooting. 338 seemed the next step going up. I'm still reading about all of this (LRS / PRS), so any comment/advise are welcomed!
6CM, 6,5CM, 260Rem, 6.5x47 would be my pick for jumping into the PRS game over the 338LM.
6.5 Creedmore and the like as hard to get as they used to be?