I use the .223 brass, have made most of my reloads from the 55gr FMJ ammo brass for years now. Seems indistinguishable on the target from their match ammo brass.
I don't do any brass prep beyond F/L resizing using a standard RCBS 2-die set, and my handloading regimen is just the basics done with reasonable care, but nothing anal. My accuracy requirements are not stringent. My rifles all have SAAMI chambers and I do not make any measurements or efforts regarding concentricity. I shoot the same handloads whatever I'm shooting; bulk HDY 55gr FMJ for 100yd, HDY 75gr HPBT-Match for beyond, all loaded to magazine length, no frills beyond CCI BR Primers.
I have some PPU .308 reloading brass from Midway, have loaded up some 178gr ELD-X, am waiting for the wildfires to end and the daily temps to come down below 100 to try them. I expect they will work fine.
I've been handloading since the early 90's and have investigated just about every reloading strategy I could afford. They all have some effect, usually beneficial, but a lot of the strategies taken together tend to even each other out. Yes, they work, but I tend to just skip to the chase, stick to the most basic reloading steps, and leave the rest to the gods. I do well enough to smile from time to time; at my age, every smile is good.
Greg