The major US ammo brands have decided that selling components doesn't make as much money as selling factory ammo.. AND the US hunter seems well prepared to buy instead of reloading.
So the options for brass supply have shrunk. 300WM brass is available.. I might have some left???
Norma and Nosler and Hornady and PRVI are filling in the voids left. PRVI is my goto if available. Norma is left kidney expensive as is Nosler but I feel Norma is the best out of the box quality right now. Hrn is not trying to make tough brass as they don't want you to load a case many times.
So, this is changing the "right" chambering for reloaders. Short magnums prices have jumped up with limited options... many are now discontinued.
The good old belted magnums are the most affordable for the case volume... but demand is now making it hard to get. But if you don't mind booking the backorders, you will get brass.
For value and decent case volume, I really like the 30-06 family of cases for long action builds. Supply is usually better and costs are way down.
Jerry