No, they really don't. Their load dev amounts to pick a cartridge, pick a powder, pick a bullet, set the seating depth to some random value then never touch it again, and run up the powder charge to where you think the velocity should be. If you call that 'in extreme depth'... good for you.
Interesting... That's not at all what I have understood from their podcast and videos.
Hornady:
>Decide what your purpose is and pick a chambering and bullet that fits that need.
>Reasearch and use data available in print and online to choose a few powders that fit the burn rate needed for that chambering and have the attributes you will need for your purpose... that is if you don't already know what you want to use.
>Load charges low, mid and higher of each of the powders chosen. Pick the powder based on which shoots the best with all three loads tested in a single powder as this is the most likely suited for your chamber and bullet.
>Set seating based on data if available to begin with. *
It's hard to recall who I have heard say what beyond that as I am a consumer of information, but the above were all stated by Hornady.
*I do recall Jayden or Miles also speaking of doing seating depth testing in large, measured steps rather than small amounts.
I am 50% sure I heard them say doing a seating depth test before powder selection is an option, but I might be confusing that gem with a trusted friend who has a significate amount of lab testing time.
