For the 25-06, you may need to buy loaded ammunition....which will give you fire formed brass to start with: Here is the search results for AmmoSeek.com for Nosler: https://ammoseek.com/ammo/25-06-remington/Nosler
I have and load for both these calibers and new brass has been almost non existent for about 5 years now.
I got so desperate I started resizing 270 brass for 25-06. There's plenty to be found. Trimming was a pain but I was surprised at how accurate the fire-forming loads were with my standard 115 Berger 4831 load.