I'm not Brent or Nate, but will throw my 2 cents in here.
Advantages are as follows:
-Better brass. The 338 Norma brass(parent case) is top notch, tough as hell, on par with Lapua brass in my opinion. Norma pulled out all the stops when making this brass.
- COAL. The COAL length of this caliber along with other wildcats(300 JAZZ) based on the 338 Norma parent case allow the use of longer VLD bullets to be used in a standard 3.60 mag design, unlike the Lapua case which requires a longer COAL in order to not set the bullet in powder colume.