I brought back some sample bullets from the SHOT Show this year. I added them to the bullets I had on hand for the picture. I don't have everything on the market pictured, but it's a pretty decent summary of the higher-BC .224 bullets currently available:
From left to right:
1 - Hornady 68gr BTHP (.355 BC)
2 - Sierra 69gr Match King (.301)
3 - Sierra 69gr Tipped Match King (.375)
4 - Berger 73gr Match BT Target (.343)
5 - Hornady 75gr BTHP (.395)
6 - Hornady 75gr A-Max (.435)
7 - Berger 77gr Match OTM Tactical (.376)
8 - Sierra 77gr Tipped Match King (.420)
9 - Berger 80gr Match VLD Target (.445)
10 - Nosler 80gr HPBT Custom Competition (.415)
11 - Berger 80.5gr Match Fullbore Target (.436)
The folks at Sierra said they designed the new TMKs to fit in confines of an AR mag. The 77gr version seems to be the highest BC available for AR-length mags, while the 69gr seems to be the highest BC available for 1-9" twist rifles. Sierra said the new TMKs were already shipping.
The Berger 77gr Tactical is supposed to fit in an AR mag, as well, but it does't seem to offer as high of a BC as the Sierra.