I don't "plink", and I don't hunt deer with a .223.
About a decade ago I started getting real anal about every rifle I own shooting 0.5 MOA or better. I have developed quite a few loads for the .223 in a 9 twist, and a couple consistently rise to the top.
If I am being cheap:
69gr Sierra Matchking
CFE223 or H335 (BIG difference in charge weight here)
CCI 400
Starline brass
- These set me back $0.36 when primers are 3 cents apiece, a pound of powder is $25, and Sierra 69's are $100. I fear those days are long gone.
If I am not being cheap:
73gr Berger boat tail target
Varget, H4895, or Viht N140
CCI BR4
Lapua or Petersen brass
- Price per cartridge rises to $0.48 apiece.
Both of these work fantastic in AR's as well as bolt rifles. As I mentioned, I lean to the OCD side. I even neck turn all of my brass, including the "cheap" .223. I get more than a little satisfaction from each bullet arriving where I intended - if it is a miss it is on me. I also take any batch of bullets off of the shelf for any task. Going to a match? grab 150, going after gophers in April? grab 500, going to the range to bang some steel with the guys out to 800? grab a couple hundred. It's nice when you have a multiple-purpose and dialed-in load.