The Norma 300 WSM
brass is excellent.
I am having a special 300 WSM built to shoot the 125grn BT at 4000fps. The only way this type of performance can be achieved, with the 300 WSM, is the Action must be either a Nesika or Bat, the barrel has to be a 1-15 twist and 30" in length, and last but not least you have to use Norma 300 WSM Brass. It is extreamly strong and of excellent quality.
Norma 300 WSM;
1. Will handle higher pressures and allow for more velocity
2. Allow for more firings per case
3. Is much more uniformed
4. Will give you better groups
You will see a big difference with Norma Brass. It's more expensive, but well worth it.