Not knowing your specific question, I’ll just post generally what I think you may be looking for…
-5.56 is inherently less accurate and higher pressure than its .223 counterpart; it sounded like you’re aware of this from your post, but it is worth mentioning…
The Speer Gold Dot Power soft point ammo is my pick for the best all-around carry/defensive round, due to its ability to penetrate barriers well, expand rapidly/consistently and be used in both .223 & 5.56 chambers. It is accurate stuff, and expands VERY well.
I have my primary mag loaded with the Speer gold dot; and secondary mags loaded wiht the same, and alos some MK318 Mod 0 SOST 62 Grain OTM (Replaced the M855/SS109 penetrator round) ; I like both, very accurate and best of both worlds for consistent expansion/defeating intermediate barriers. (Both of these rounds are available from G&R tactical by the way ;))
I love PPU’s match grade 75 grain (Also the 65 & 62 grainers) boat tail (.223); it is accurate as hell and at a great price point for comparative ammo. This is the ammo I use the most of, I train with it (As well as the speer and MK318), and use the cheap stuff (Wold & Silver bear) just to go blow off steam or have some fun messin around puttin holes in shit.
I also like Black Hills moly coated 75 grain match boat tail, but it is over twice as expensive as the PPU stuff, and I see no benefit in accuracy or any other department for that matter. SO I tend to stick to the PPU, it is good stuff for a good price.
As far as the cheap stuff is concerned, I use wolf & silver bear. Never had any problems, one dud round from Wolf, but no malfs or stoppages from either other than a dud round.
I would avoid TULA ammo, I’ve heard lots of negatives about htat stuff; I got a (500) round case; shot it all in one day, and the accuracy was all over the place, I didn’t have any problems with malfs or stoppages like others I new had from the TULA, but I wasn’t keen on the accuracy being so varied from round to round; it was really all over the place.