I've only reloaded a minimal amount of .224 nosler partitions for when we use to shoot caribou with the A2 prebans; then all the other AR platform calibers came out; the .556s never come outta the safe nowadays. AR Guy, best thing I ever did was buy 9-10 cases of win Q3131 white box around 1990. And to think the wife thought I was nutty for spending $179/thou; she don't no more. We've shot that white box off for years now and never bought no more .556 ever again.
No joke, you watch in about 6 months, there will be good .556 at fair prices. That's when you make your move and forget about it; and all the future ammo worries will be gone, no joke. Even the wife doesn't regret it today. I keep reminding her in a few months she's going to have to spend a few gran on 308 win.