That’s what I did. Bought 200 rnds of Hornady factory ammo to break in the barrel and accumulate brass. Bought another hundred pieces of Hornady brass from GAP so it was all the same.
I’m at 5-6x fired right now and during that time I’ve had to cull about 6 pieces of brass due to loose primer pockets. I’ll stick with the Hornady brass until my barrel is shot out, then I’m switching to Alpha when I screw on my new barrel.