Just buy 200 rounds of factory Hornady 147 ELDM, break in the barrel, maybe kill some stuff, and the use the brass to reload.
R26 and H1000 are your sweet spot for powders.
This ^^^^^
$400 dollars in ammo to get some Hornady brass while burning up 200 rnds of barrel life all before starting load work up? That's too much wasted time, energy, and money for me. I'd buy some ADG brass off the bat (or Hornady if that's what you want), work up a load, and spend your time shooting it for what it's intended.
