338 Norma is pretty awesome but it’s a bit slower than 338 lapua.Wow that's a lot more reasonable than I would of thought.
Have you considered the 338 Norma? I had the opportunity to take a couple of shots with a custom 700 action/shilen rifle chambered in 338 Norma. It was only 1000 yards but it was an incredibly flat & powerful round. The guy who owned the rifle said it started out as the Lapua and he had the chamber cut to Norma specs. I've never shot a 338 Lapua but that Norma was impressive.
Really it’s biggest benefit is how it fits better with 300’s in magazines.
It is really easy to find a decent load with as well.