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What brass for 300WM

Market availability is going to answer your question.
Lapua quit making it years ago.
RWS if you can find it
Norma if you can find it
Probably be able to find Nosler
Probably be able to find iHornady
Probably be able to find Prvi Partizan

about the only way to find others is getting once fired Win or Rem or Federal as far component from those three are vapor ware.....
Or Black Hills headstamped brass should be Win mfg
Detail prep will make most brass very serviceable.
 
BHA brass is providing me excellent results. I get it once fired. Use the Larry Willis collet resizing tool, prep the primer pocket, and send out for annealing. The results are good.
You can get Norma brass, which I have some and it seems to work as well as the BHA despite all the reputation of Norma brass being soft.